Cover [Abstract] Amendment Flag Current Fiscal Year End Date Document Period End Date Entity [Domain] Entity [Domain] Entity Address, State or Province Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Entity Registrant Name Entity Central Index Key Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Legal Entity [Axis] Legal Entity [Axis] Document Type Entity Interactive Data Current Entity Shell Company Entity Emerging Growth Company Entity Small Business Changes in AOCL [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Award Type [Axis] Number of securities with market fair value less than amortized cost ASU 2016-13 [Member] ACCOUNTING POLICIES [Abstract] ASU 2016-02 [Member] Accounting Standards Update 2016-02 [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accretion of discount on subordinated debentures Accretion Expense Unrealized Gains (Losses) on Securities Available for Sale [Member] AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] OTTI recognized in accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities Unrealized Gains (Losses) on Cash Flow Hedges [Member] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated other comprehensive loss Accumulated other comprehensive loss for regulatory purposes Accumulated Other Comprehensive Income (Loss), Net of Tax ACCUMULATED OTHER COMPREHENSIVE LOSS [Abstract] Accumulated Other Comprehensive Loss [Member] Residential Adjustable Rate Mortgage [Member] Adjustable Rate Residential Mortgage [Member] Total Adjustments Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities ADJUSTMENTS TO RECONCILE NET INCOME TO NET CASH FROM OPERATING ACTIVITIES ADJUSTMENTS TO RECONCILE NET INCOME TO NET CASH FROM OPERATING ACTIVITIES [Abstract] Share based compensation withholding obligation Share-based Payment Arrangement, Decrease for Tax Withholding Obligation Adjustments for New Accounting Pronouncements [Axis] Advances from the FHLB Total FHLB advances, Amount Advertising Total compensation expense recognized Share-based Payment Arrangement, Expense Increase (decrease) in allowance for loan losses Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment Intangible amortization expense Amortization of Intangible Assets Antidilutive Securities [Axis] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities, Name [Domain] Antidilutive shares excluded from computation of diluted loss per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Other Asset Backed [Member] Impairment charges recognized [Abstract] Other real estate, additional charge Assets [Abstract] Assets, Fair Value Disclosure [Abstract] ASSETS ASSETS [Abstract] Assets [Abstract] Total Assets Assets Supplemental balance sheet information related to operating leases [Abstract] Unrealized gains Amortized cost Debt Securities, Available-for-sale, Amortized Cost Available-for-sale Securities, Amortized Cost Basis [Abstract] Unrealized losses Securities available for sale Securities available for sale Amortized cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost Total available-for-sale securities fair value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value Maturing within one year Maturing after ten years Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] Maturing within one year Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost Maturing after ten years Maturing after five years but within ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost U.S. agency residential mortgage-backed Maturing after one year but within five years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost Maturing after five years but within ten years Maturing after one year but within five years Gain and losses realized on sale of securities available for sale [Abstract] U.S. agency residential mortgage backed Fair value Total Debt Securities, Available-for-sale Balance Sheet Location [Domain] Balance Sheet Location [Axis] Bank-owned life insurance Bank owned life insurance Bank owned life insurance REGULATORY MATTERS [Abstract] Buildings [Member] Building [Member] Total assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Cash and cash equivalents Total liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Equity issued under merger agreement (in shares) Business Acquisition [Line Items] Business Acquisition [Axis] RECENT ACQUISITION [Abstract] Business Acquisition, Acquiree [Domain] Property and equipment, net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Recent Acquisition [Abstract] Business Combination, Description [Abstract] RECENT ACQUISITION Business Combination Disclosure [Text Block] Valuation of the assets acquired and liabilities assumed [Abstract] Net assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Merger related expenses Non-interest expense amount Purchase price (fair value of consideration) Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Total risk-based capital Capital Total capital to risk-weighted assets [Abstract] Actual, Ratio Capital to Risk Weighted Assets Minimum for Well-Capitalized Institutions, Amount Capital Required to be Well Capitalized Minimum for Well-Capitalized Institutions, Ratio Minimum for Adequately Capitalized Institutions, Ratio Minimum for Adequately Capitalized Institutions, Amount Recorded Book Balance [Member] Reported Value Measurement [Member] Net Increase (Decrease) in Cash and Cash Equivalents Cash and Cash Equivalents, Period Increase (Decrease) Net Increase (Decrease) in Cash and Cash Equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Cash and Cash Equivalents at Beginning of Year Cash and Cash Equivalents at End of Year Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash received in the acquisition of TCSB Bancorp Inc. Acquisition of business, less cash received Information Regarding Options Exercised Cash and Cash Equivalents Cash and Cash Equivalents at End of Year Cash and Cash Equivalents at Beginning of Year Cash and Cash Equivalents, at Carrying Value STATEMENTS OF CASH FLOWS Cash and due from banks Unrealized losses on cash flow hedges, net of tax Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months Cash Flow Hedge Designation [Member] Cash Flow Hedging [Member] Non accretable difference Certain Loans Acquired in Transfer, Nonaccretable Difference Purchase Credit Impaired (PCI) Loans Accretable yield Certain Loans Acquired in Transfer, Accretable Yield Reclassification from (to) nonaccretable difference Disposals/other adjustments New loans purchased Balance at beginning of period Balance at end of period Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Accretion of income Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion Accretable yield of PCI loans, or income expected to be collected [Roll Forward] Fair value of acquired loans at acquisition Carrying amount, net of allowance for loan losses Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net Cash flows expected to be collected at acquisition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition Contractually required payments Allowance for loan losses Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses Total carrying amount Loans acquired with deteriorated credit quality Class of Stock [Line Items] Stock Reserved [Line Items] U.S. Agency Commercial Mortgage-Backed [Member] Commercial [Member] Commercial [Member] Commitments and contingent liabilities Commitments to Extend Credit [Member] COMMITMENTS AND CONTINGENT LIABILITIES [Abstract] COMMITMENTS AND CONTINGENT LIABILITIES Commitments and Contingencies Disclosure [Text Block] Common Stock Subject to Mandatory Redemption [Member] Common stock reserved for issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Common Stock [Member] Actual, Amount Common equity tier 1 capital Common Equity Tier One Capital Common Stock [Abstract] Cash dividends declared (in dollars per share) Minimum for Adequately Capitalized Institutions, Amount Common Equity Tier One Capital Required for Capital Adequacy Minimum for Well-Capitalized Institutions, Amount Common Equity Tier One Capital Required to be Well-Capitalized Common equity tier 1 capital to risk-weighted assets [Abstract] Common Equity Tier One Capital [Abstract] Common stock, par value (in dollars per share) Common stock, shares issued (in shares) Common stock, shares authorized (in shares) Common stock, shares outstanding (in shares) Common stock, no par value, 500,000,000 shares authorized; issued and outstanding: 22,481,643 shares at December 31, 2019 and 23,579,725 shares at December 31, 2018 Common Stock, Value, Issued Communications Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Components of deferred tax assets and liabilities [Abstract] COMPREHENSIVE INCOME Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent ACCUMULATED OTHER COMPREHENSIVE LOSS Comprehensive Income (Loss) Note [Text Block] Concentration Risk Type [Domain] Concentration Risk [Line Items] CONCENTRATIONS OF CREDIT RISK Concentration Risk Disclosure [Text Block] Concentration Risk Type [Axis] Concentration Risk [Table] INDEPENDENT BANK CORPORATION (PARENT COMPANY ONLY) FINANCIAL INFORMATION Condensed Financial Information of Parent Company Only Disclosure [Text Block] Consolidated [Member] Consolidated Entities [Member] PRINCIPLES OF CONSOLIDATION Construction [Member] Consumer [Member] Retail [Member] Contract liabilities Contract assets Core Deposits [Member] Corporate [Member] Credit Loss Status [Axis] Credit Loss Status [Domain] Cumulative effect of change in accounting Cumulative Effect of New Accounting Principle in Period of Adoption Current expense Disaggregation of Revenue Sources by Attribute Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Table] Disaggregation of Revenue Sources by Attributes [Abstract] Designated as Hedging Instrument [Member] Losses Twelve Months or More, Fair Value Total, Unrealized Losses Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Total, Fair value Debt Securities, Available-for-sale, Unrealized Loss Position Debt Securities, Available-for-sale [Table] Less Than Twelve Months, Fair Value Net gains on securities Debt and Equity Securities, Realized Gain (Loss) 2019 [Member] Debt Instrument, Redemption, Period One [Member] Realized gains Debt Instrument, Redemption, Period [Axis] 2018 [Member] Debt Instrument, Redemption, Period Two [Member] Debt Instrument, Redemption, Period [Domain] Issue Date Debt Instrument, Issuance Date Twelve Months or More, Unrealized Losses Less Than Twelve Months, Unrealized Losses Interest Rate Spread Debt Instrument, Basis Spread on Variable Rate OTHER BORROWINGS [Abstract] OTHER BORROWINGS Debt Disclosure [Text Block] Interest Rate Trust Preferred Securities Issued Debt Instrument, Face Amount Maturity Date Discount Debt Instrument, Unamortized Discount Deferred tax assets, net Deferred Income Tax Assets, Net Property and equipment Deferred Tax Assets, Property, Plant and Equipment Unrealized loss on securities available for sale Deferred expense Gross deferred tax liabilities Deferred Tax Liabilities, Gross Unrealized loss on derivative financial instruments Gross deferred tax assets Deferred Tax Assets, Gross Deferred tax assets, net Deferred Tax Assets, Net Deferred tax assets [Abstract] Deferred compensation Alternative minimum tax credit carry forward Other Deferred Tax Assets, Other Share based compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Allowance for loan losses Deferred tax liabilities [Abstract] Other Maximum contribution of employees' eligible wages Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Employee matching contribution, percentage Defined Contribution Plan, Employer Matching Contribution, Percent of Match 401(k) and employee stock ownership plans amount expensed Defined Contribution Plan, Cost DEPOSITS Deposit Liabilities Disclosures [Text Block] Total Deposits Deposits Savings and interest-bearing checking DEPOSITS [Abstract] Deposits Net depreciation, amortization of intangible assets and premiums and accretion of discounts on securities, loans and interest bearing deposits - time Depreciation, Amortization and Accretion, Net Depreciation expense Average Maturity Derivative financial instrument according to type of hedge [Abstract] Derivative financial instruments Derivatives DERIVATIVE FINANCIAL INSTRUMENTS [Abstract] Derivative Instrument [Axis] Derivative Instrument [Axis] Notional Amount DERIVATIVE FINANCIAL INSTRUMENTS Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivative financial instruments Derivatives Derivative Liability Fair value of derivative instruments, balance sheet location [Abstract] Fair Value Asset Derivatives Derivative Asset, Fair Value, Gross Asset Gain (Loss) Recognized in Income Liability Derivatives Hedging Relationship [Axis] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Line Items] Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion) Derivative Contract [Domain] Derivatives, Fair Value [Line Items] DERIVATIVE FINANCIAL INSTRUMENTS Carrying amount of loans that meet the criteria of ASC 310-30 treatment [Abstract] SHARE BASED COMPENSATION AND BENEFIT PLANS [Abstract] SHARE BASED COMPENSATION AND BENEFIT PLANS Share-based Payment Arrangement [Text Block] Cash dividends declared Dividends, Common Stock, Cash Earnings Per Share Reconciliation [Abstract] Diluted (in dollars per share) Earnings Per Share, Diluted Basic (in dollars per share) Earnings Per Share, Basic NET INCOME PER COMMON SHARE Earnings Per Share, Policy [Policy Text Block] Net income per common share Statutory federal income tax rate Tax benefit relating to compensation expense recognized Share-based Payment Arrangement, Expense, Tax Benefit Tax benefit realized Total compensation cost not yet recognized Total compensation cost not yet recognized, period for recognition Stock Options [Member] Equipment [Member] Furniture, fixtures and equipment Equipment Expense Equity securities at fair value Equity Securities, FV-NI Equity Component [Domain] Equity securities at fair value, net gains (losses) Equity Securities, FV-NI, Unrealized Gain (Loss) Custodial deposit accounts Escrow Deposit Fair Value [Member] Estimate of Fair Value Measurement [Member] Estimated fair value of intangible assets Included in other comprehensive income (loss) Asset Fair Value [Abstract] Included in results of operations Amount of total losses for the period included in earnings attributable to the change in unrealized losses relating to assets and liabilities still held at December 31 Quantitative information about Level 3 fair value measurement measured on a non recurring basis [Abstract] FAIR VALUE DISCLOSURES [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Recurring Basis [Member] Fair Value, Recurring [Member] Assets and Liabilities Measured at Fair Value Fair Value, Measurement Frequency [Domain] Fair Value by Liability Class [Domain] Nonrecurring Basis [Member] Fair Value, Nonrecurring [Member] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Quantitative Information About Level 3 Fair Value Measurements Measured on a Recurring Basis and Non-recurring Basis Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value, Hierarchy and NAV [Axis] Fair Value Measurement Inputs and Valuation Techniques [Table] Changes in fair value for financial assets [Abstract] Assets and liabilities measured at fair value [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] Measurement Frequency [Axis] Liability Class [Axis] Measurement Basis [Axis] FAIR VALUE DISCLOSURES Fair Value Disclosures [Text Block] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, by Balance Sheet Grouping [Table] Estimated Fair Values and Recorded Book Balances Fair Value, by Balance Sheet Grouping [Table Text Block] Reconciliation for all Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Concentration of Risk [Abstract] Concentration of risk loans receivable Fair Value Measurement [Domain] Quoted Prices in Active Markets for Identical Assets, (Level 1) [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Significant Unobservable Inputs, (Level 3) [Member] Significant Unobservable Inputs (Level 3) [Member] Fair Value, Inputs, Level 3 [Member] Significant Other Observable Inputs, (Level 2) [Member] Significant Other Observable Inputs (Level 2) [Member] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Reconciliation for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) [Roll Forward] Purchases, issuances, settlements, maturities and calls Transfers in and/or out of Level 3 Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Difference Fair Value, Option, Aggregate Differences, Loans and Long-term Receivables Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Value, Option, Quantitative Disclosures [Line Items] Changes in Fair Value for Financial Assets Fair Value Hedge Designation [Member] Fair Value, Option, Quantitative Disclosures [Table] Federal Home Loan Bank and Federal Reserve Bank stock, at cost Federal Home Loan Bank and Federal Reserve Bank Stock Federal Home Loan Bank Stock and Federal Reserve Bank Stock Federal Home Loan Banks [Abstract] FHLB advances terminated Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Repayment and Penalties Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] Federal funds purchased Federal home loan bank stock Advances from Federal Home Loan Bank ("FHLB") [Member] FDIC deposit insurance Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract] Unused borrowing capacity with FHLB Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due [Abstract] 2020, Rate 2022, Rate Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, Three to Four Years from Balance Sheet Date 2019, Rate Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due within One Year of Balance Sheet Date 2025 and thereafter, Rate 2019 2022 Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Four 2020 Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Two 2025 and thereafter Federal Reserve Bank Advances [Member] Federal Reserve Bank Advances [Member] LOANS HELD FOR SALE Financing Receivable, Held-for-sale [Policy Text Block] Financial Instrument Performance Status [Domain] Financial Instrument Performance Status [Axis] Loans Acquired with Deteriorated Credit Quality [Member] Financial Instrument [Axis] FAIR VALUES OF FINANCIAL INSTRUMENTS [Abstract] Liabilities [Abstract] Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Assets [Abstract] Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] FAIR VALUES OF FINANCIAL INSTRUMENTS Financial Instruments Disclosure [Text Block] Loans Past Due, 60-89 days [Member] Total Analysis of allowance for loan losses by portfolio segment [Roll Forward] Number of contracts Financing Receivable, Modifications, Number of Contracts Recorded Balance Financing Receivable, Troubled Debt Restructuring, Subsequent Default Financing Receivable, Recorded Investment [Line Items] Loans charged against the allowance Financing Receivable, Allowance for Credit Loss, Writeoff Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Loan Ratings by Loan Class Financing Receivable Credit Quality Indicators [Table Text Block] Financing Receivable, Modifications [Line Items] Class of Financing Receivable, Type [Domain] Financing Receivables, Period Past Due [Domain] Financing Receivable, Recorded Investment, Past Due [Line Items] Loans Past Due, 90+ days [Member] Post-modification recorded balance Financing Receivable, Troubled Debt Restructuring, Postmodification Non-Accrual Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Axis] Loans not Past Due Financing Receivable, Not Past Due Collectively evaluated for impairment Financing Receivables, Period Past Due [Axis] Individually evaluated for impairment Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Individually evaluated for impairment Number of contracts Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts Recoveries credited to allowance Aging analysis of loans by class [Abstract] Financing Receivable, Recorded Investment, Aging [Abstract] 90+ and Still Accruing Loans Past Due, 30-59 days [Member] Loans Not Past Due [Member] Financing Receivable, Impaired [Line Items] Pre-modification recorded balance Financing Receivable, Troubled Debt Restructuring, Premodification Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Charge offs due to troubled debt restructurings Allowance for loan losses and recorded investment in loans by portfolio segment [Abstract] Financing Receivable, Allowance for Credit Losses [Line Items] Balance at end of period Balance at beginning of period Financing Receivable, Allowance for Credit Loss Collectively evaluated for impairment Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Gross Carrying Amount Total Finite-Lived Intangible Assets, Net Finite-Lived Intangible Assets, Major Class Name [Domain] 2025 and thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Accumulated Amortization Other Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets by Major Class [Axis] 2020 Summary of estimated core deposit intangible amortization [Abstract] Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Estimated useful lives Estimated useful life 2021 2024 2022 2023 Residential Fixed Rate Mortgage [Member] Fixed Rate Residential Mortgage [Member] Fixed Income Interest Rate [Member] Other real estate and repossessed assets, net Other real estate and repossessed assets Foreign Government [Member] Gain (loss) on sale of assets Net gains on mortgage loans Mortgage loans Gain (loss) on sale of loans Gain (Loss) on Sales of Loans, Net Net gains on other real estate and repossessed assets Gains (Losses) on Sales of Other Real Estate Net gains on assets Gain (Loss) on Disposition of Assets for Financial Service Operations [Abstract] Decrease in goodwill GOODWILL AND OTHER INTANGIBLES Goodwill and Intangible Assets Disclosure [Text Block] GOODWILL Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Unamortized intangible assets - goodwill [Abstract] Goodwill, Impaired, Accumulated Impairment Loss [Abstract] Goodwill Gross Carrying Amount Goodwill and Other Intangibles [Abstract] Hedging Designation [Axis] Hedging Relationship [Domain] Hedging Designation [Domain] Average Recorded Investment Interest Income Recognized, with an allowance for loan losses recorded Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method Impaired Loans Impaired Loans by class [Abstract] Impaired Financing Receivable, Recorded Investment [Abstract] Interest Income Recognized, with no related allowance for loan losses recorded Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method Average Recorded Investment, with no related allowance for loan losses recorded Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment Average Recorded Investment, with an allowance for loan losses recorded Impaired Financing Receivable, with Related Allowance, Average Recorded Investment Interest Income Recognized Impaired Financing Receivable, Interest Income, Accrual Method Recorded Investment, with an allowance for loan losses recorded Impaired Financing Receivable, with Related Allowance, Recorded Investment Unpaid Principal Balance, with no related allowance for loan losses recorded Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance Unpaid Principal Balance, with an allowance for loan losses recorded Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance Recorded Investment, with no related allowance for loan losses recorded Impaired Financing Receivable, with No Related Allowance, Recorded Investment Recorded Investment Impaired Financing Receivable, Recorded Investment Related Allowance Impaired Financing Receivable, Related Allowance Unpaid Principal Balance INCOME TAX [Abstract] Income Statement Location [Axis] Income Statement Location [Domain] Equity in undistributed net income of subsidiaries Income (Loss) from Equity Method Investments CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract] CONDENSED STATEMENTS OF OPERATIONS [Abstract] Equity in undistributed net income of subsidiaries Income (Loss) from Equity Method Investments, Net of Dividends or Distributions INCOME TAX Income Tax Disclosure [Text Block] Income Before Income Tax Total reclassifications before tax Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income tax expense Income tax expense (benefit) Income tax expense Income tax expense [Abstract] Statutory rate applied to income before income tax Reconciliation of income tax expense [Abstract] Effective Income Tax Rate Reconciliation, Amount [Abstract] Change in statutory rate Tax-exempt income Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount INCOME TAXES Income Tax, Policy [Policy Text Block] Other, net Non-deductible meals, entertainment and memberships Income taxes Increase in accrued expenses and other liabilities Deferred income tax expense Deferred income tax expense Increase (Decrease) in Deferred Income Taxes Net increase in total deposits Increase in accrued income and other assets (Increase) decrease in accrued income and other assets Increase (Decrease) in Other Operating Assets Loans held for sale [Abstract] Increase (Decrease) in Loans Held-for-sale [Abstract] Deferred loan fees and costs Increase (Decrease) in Loans, Deferred Income Increase (Decrease) in Stockholders' Equity [Roll Forward] Effect of stock options (in shares) Other intangibles Amortized intangible assets - core deposits [Abstract] Goodwill and other intangibles Intangible Assets, Net (Including Goodwill) OTHER INTANGIBLES Intangible Assets, Finite-Lived, Policy [Policy Text Block] Interest and fees on loans Interest on securities Accrued interest payable INTEREST INCOME Total Interest Income Interest income Interest and Dividend Income, Operating Time Interest Expense Domestic Deposit Liabilities, Time Deposit Brokered time Interest Expense Domestic Deposit Liabilities, Brokered INTEREST EXPENSE Interest Expense [Abstract] Total Interest Expense Interest expense Interest expense Interest expense on federal funds purchased Interest Expense, Federal Funds Purchased Other borrowings and subordinated debentures Interest Expense, Borrowings Interest expense on FHLB advances Savings and interest-bearing checking Interest Expense, NOW Accounts, Money Market Accounts, and Savings Deposits Summary of interest expense on deposits [Abstract] Interest Expense, Deposits [Abstract] Total Deposits Interest Expense, Deposits Net Interest Income Interest Income (Expense), Net Taxable Tax-exempt Net Interest Income After Provision for Loan Losses Interest Income (Expense), after Provision for Loan Loss Interest Income [Member] Interest Interest bearing deposits Interest-bearing Deposits in Banks and Other Financial Institutions Interest-Rate Cap Agreements [Member] Accrued interest included in total Accrued interest included in recorded investment Interest Receivable Rate-Lock Mortgage Loan Commitments [Member] Interest Rate Swap Member] Interest Rate Swap [Member] Brokered time Interest-bearing Domestic Deposit, Brokered Interest Expense [Member] Accrued interest receivable Time Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Investments [Domain] Investment Owned [Abstract] Number of shares owned (in shares) Investment Owned, Balance, Shares Investment Type [Axis] SECURITIES Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] SECURITIES [Abstract] Amortized Cost and Fair Value of Securities Available for Sale by Contractual Maturity Investment in subsidiaries Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Subordinated Debentures Subordinated debentures Subordinated debentures 2025 and thereafter Lessee, Operating Lease, Liability, Payments, Due after Year Five 2020 Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months 2023 Lessee, Operating Lease, Liability, Payments, Due Year Four 2024 Lessee, Operating Lease, Liability, Payments, Due Year Five Total lease payments Lessee, Operating Lease, Liability, Payments, Due Maturity Analysis of Lease Liabilities Less imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount 2022 Lessee, Operating Lease, Liability, Payments, Due Year Three 2021 Lessee, Operating Lease, Liability, Payments, Due Year Two Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Compensation and employee benefits Land and Land Improvements [Member] Components of operating leases [Abstract] Total Lease, Cost Components of Operating Leases LEASES Leases of Lessee Disclosure [Text Block] LEASES [Abstract] Liabilities [Abstract] Liabilities, Fair Value Disclosure [Abstract] Liabilities and Shareholders' Equity LIABILITIES AND SHAREHOLDERS' EQUITY [Abstract] Liabilities and Equity [Abstract] Total Liabilities Liabilities Total Liabilities and Shareholders' Equity Liabilities and Equity Repayments Loans and Leases Receivable, Related Parties, Proceeds Allowance for loan losses Total ending allowance for loan losses balance Loans and Leases Receivable, Allowance ALLOWANCE FOR LOAN LOSSES Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block] Net of deferred loan costs Balance at end of year Balance at beginning of year Loans and Leases Receivable, Related Parties Loans Loans [Abstract] New loans and advances Loans held for sale, carried at fair value Aggregate Fair Value Loans Held-for-sale, Fair Value Disclosure Loans [Abstract] Loans and Leases Receivable, Other Information [Abstract] Summary of loans and leases receivable [Roll Forward] Loans and Leases Receivable, Related Parties [Roll Forward] Net Loans Loans and Leases Receivable, Net Amount Loans Total Loans Loans and Leases Receivable, Net of Deferred Income Loans receivable LOANS AND PAYMENT PLAN RECEIVABLES Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Contractual Principal Loans Receivable Held-for-sale, Amount Net gains on securities Securities Marketable Securities, Gain (Loss), Excluding Other-than-temporary Impairment Loss SECURITIES Marketable Securities, Policy [Policy Text Block] Summary of the maturity of time deposits [Abstract] Maturities of Time Deposits [Abstract] Prepayment Rate [Member] Measurement Input Type [Domain] Adjustment for Differences Between Comparable Sales [Member] Discount Rate [Member] Measurement Input Type [Axis] Mortgage loans in process of foreclosure Private Label Mortgage-Backed [Member] U.S. Agency Residential Mortgage-Backed [Member] Non-performing TDR's [Member] Non-Performing Loans [Member] Net Cash From Operating Activities Net Cash Provided by (Used in) Operating Activities Net Cash Used in Investing Activities Net Cash Provided by (Used in) Investing Activities CASH FLOW USED IN INVESTING ACTIVITIES CASH FLOW FROM (USED IN) INVESTING ACTIVITIES [Abstract] Net Cash From Financing Activities Net Cash Provided by (Used in) Financing Activities Net income Net Income Net income Total reclassifications for the period, net of tax CASH FLOW FROM FINANCING ACTIVITIES CASH FLOW USED IN FINANCING ACTIVITIES [Abstract] Net income per common share [Abstract] Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] New Accounting Pronouncements or Change in Accounting Principle [Line Items] ADOPTION OF NEW ACCOUNTING STANDARDS New Accounting Pronouncements, Policy [Policy Text Block] Expected increase in the allowance for loan losses New Accounting Pronouncements or Change in Accounting Principle [Table] Non-interest bearing Total Non-Interest Income Noninterest Income OTHER NON-INTEREST INCOME [Abstract] NON-INTEREST EXPENSE Noninterest Expense [Abstract] Other Total Total Noninterest Income, Other Operating Income Total Non-interest Expense Noninterest Expense NON-INTEREST INCOME Noninterest Income [Abstract] Number of reportable segments No Hedge Designation [Member] No Hedge Designation [Member] Other comprehensive income (loss) before reclassifications OCI, before Reclassifications, Net of Tax, Attributable to Parent Occupancy, net COMMITMENTS TO EXTEND CREDIT AND RELATED FINANCIAL INSTRUMENTS Off-Balance-Sheet Credit Exposure, Policy [Policy Text Block] Open tax year Maturities of lease liabilities [Abstract] Weighted average remaining lease term (years) Right of use asset Lease right of use asset Operating lease cost Operating Lease, Liability, Statement of Financial Position [Extensible List] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Total Operating Expenses Operating Expenses Weighted average discount rate Total Operating Income Operating Income (Loss) OPERATING INCOME [Abstract] Operating leases Operating Lease, Payments OPERATING EXPENSES [Abstract] Lease liability Total Lease liabilities Reclassification adjustments for gains included in earnings Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Reclassification adjustment for (income) expense recognized in earnings Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax Unrealized gains (losses) recognized in other comprehensive income (loss) on derivative instruments Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax Income tax expense (benefit) Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Other Real Estate [Roll Forward] Income tax expense (benefit) Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax Unrealized gains (losses) recognized in other comprehensive income (loss) on securities available for sale Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax Unrealized gains (losses) recognized in other comprehensive income (loss) on securities available for sale, net of tax Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax Net impairment loss recognized in earnings Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities Additions to credit losses on securities for which no previous OTTI was recognized Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] Increases to credit losses on securities for which OTTI was previously recognized Balance at end of period Balance at beginning of period Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held Total Other borrowings Other borrowings Other Borrowings OtherAssets Accrued income and other assets Securities available for sale Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax [Abstract] Derivative instruments Unrealized gains (losses) recognized in other comprehensive income (loss) on derivative instruments, net of tax Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Unrealized gains (losses) arising during period Gain (Loss) Recognized in Other Comprehensive Income (Loss) (Effective Portion) Unrealized gain (loss) arising during period Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax Administrative and other expenses Other investments OtherLiabilities Accrued expenses and other liabilities Other Other Noninterest Expense Other income Other Operating Income Other Assets [Member] Other Liabilities [Member] Other comprehensive income (loss) Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent [Abstract] Other comprehensive income (loss) Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Performing TDR's [Member] Aging Analysis of Loans by Class Financing Receivable, Past Due [Table Text Block] Share based compensation withholding obligation Share based compensation withholding obligation Payment, Tax Withholding, Share-based Payment Arrangement Disbursements for loans held for sale Payments for Origination of Mortgage Loans Held-for-sale Repurchase of common stock Payments for Repurchase of Common Stock Purchase of Federal Reserve Bank stock Payments to Acquire Federal Reserve Bank Stock Purchases of securities available for sale Payments to Acquire Available-for-sale Securities Dividends paid Payments of Dividends Capital expenditures Payments to Acquire Property, Plant, and Equipment Performance Stock Units [Member] Plan Name [Axis] Plan Name [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Preferred stock, par value (in dollars per share) Preferred Stock, No Par Value Securities [Member] Preferred Stock [Member] Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Preferred stock, no par value, 200,000 shares authorized; none issued or outstanding Preferred Stock, Value, Issued Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized RECLASSIFICATION Proceeds from the maturity of interest bearing deposits - time Maturity of interest bearing deposits - time Proceeds from (Payments for) in Interest-bearing Deposits in Banks Net increase (decrease) in other borrowings Proceeds from Federal Home Loan Bank advances Proceeds from FHLBank Borrowings, Financing Activities Proceeds from issuance of common stock Proceeds from issuance of common stock Cash received from the sale of Mepco Finance Corporation assets, net Cash proceeds from sale of assets Proceeds from maturities, prepayments and calls of securities available for sale Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Proceeds from bank-owned life insurance Proceeds from the sale of securities available for sale Proceeds from sales of loans held for sale Proceeds from Sale of Loans Held-for-sale Proceeds from the sale of other real estate and repossessed assets Proceeds from the sale of portfolio loans Proceeds from sale of loans Proceeds Cash proceeds received Proceeds from the sale of property and equipment Legal and professional Estimated useful lives Property, Plant and Equipment, Useful Life Property and equipment, gross Property, Plant and Equipment [Line Items] PROPERTY AND EQUIPMENT Property, Plant and Equipment Disclosure [Text Block] Summary of Property and Equipment Property, Plant and Equipment [Table Text Block] PROPERTY AND EQUIPMENT [Abstract] Property and Equipment [Abstract] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property and equipment, net Property and equipment, net PROPERTY AND EQUIPMENT Property, Plant and Equipment, Net [Abstract] Provision for loan losses Provision for loan losses Additional provision for loan losses on impaired loans Right of use assets obtained in exchange for lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Additions charged to expense Real Estate Owned, Valuation Allowance, Provision OTHER REAL ESTATE [Abstract] OTHER REAL ESTATE Real Estate Owned [Text Block] Other real estate, valuation allowance Balance at end of year Balance at beginning of year Real Estate Owned, Valuation Allowance Real Estate Owned Valuation Allowance [Roll Forward] Direct write-downs upon sale Real Estate Owned, Valuation Allowance, Amounts Applied Credit Losses Recognized in Earnings on Securities Available for Sale LOANS AND PAYMENT PLAN RECEIVABLES [Abstract] Reclassifications Out of Each Component of AOCL Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Reclassification out of Accumulated Other Comprehensive Income [Domain] Amounts reclassified from AOCL Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Reclassification Out Of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Member] Changes in unrecognized tax benefits [Roll Forward] REGULATORY MATTERS Regulatory Capital Requirements under Banking Regulations [Text Block] RELATED PARTY TRANSACTIONS [Abstract] Related Party Transaction [Line Items] Related Party Transaction [Abstract] RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] Directors and executive officers deposit Payments of Federal Home Loan Bank advances Payments of FHLBank Borrowings, Financing Activities Residential Real Estate [Member] Mortgage [Member] Residential Portfolio Segment [Member] Residential First Mortgages [Member] Residential Mortgage [Member] Restricted Stock [Member] RESTRICTIONS ON CASH AND DUE FROM BANKS Restricted Assets Disclosure [Text Block] RESTRICTIONS ON CASH AND DUE FROM BANKS [Abstract] Retained Earnings (Accumulated Deficit) [Member] Retained earnings (accumulated deficit) REVENUE FROM CONTRACTS WITH CUSTOMERS [Abstract] REVENUE FROM CONTRACTS WITH CUSTOMERS Revenue from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax LOAN REVENUE RECOGNITION CONCENTRATIONS OF CREDIT RISK [Abstract] Exercisable, weighted-average remaining contractual term Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Vested and expected to vest, weighted-average remaining contractual term Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Exercisable, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Outstanding, weighted-average remaining contractual term Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Estimated Amortization of Other Intangible Assets As Adjusted [Member] Gains and Losses Realized on Sale of Securities Available for Sale Schedule of Realized Gain (Loss) [Table Text Block] Summary of Loans to Directors and Executive Officers Schedule of Related Party Transactions [Table Text Block] Outstanding Stock Option Grants and Transactions Changes in Unrecognized Tax Benefits Final Valuation of Assets Acquired and Liabilities Assumed Investments in a Continuous Unrealized Loss Position Schedule of Finite-Lived Intangible Assets [Table] Schedule of Impaired Financing Receivable [Table] Non-Vested Restricted Stock, Restricted Stock Units and PSU's Securities Available for Sale Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Loans on Non-Accrual Status and Past Due More than 90 Days Composition of Income Tax Expense Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Deferred Tax Assets and Deferred Tax Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Analysis of Allowance for Loan Losses by Portfolio Segment Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Other Intangible Assets, Net of Amortization Reconciliation of Basic and Diluted Net Income Per Share Reconciliation of Income Tax Expense Computed by Applying the Statutory Federal Income Tax Rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Accumulated Other Comprehensive Loss (AOCL), Net of Tax Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Actual Capital Amounts and Ratios and Components of Regulatory Capital Schedule of Business Acquisitions, by Acquisition [Table] Other Borrowings Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Debt Securities, Available-for-sale [Line Items] Schedule of Available-for-sale Securities [Table] FHLB Advances Schedule of Federal Home Loan Bank, Advances, by Branch of FHLB Bank [Table Text Block] Schedule of Fair Value, Off-balance Sheet Risks [Table] Schedule of Federal Home Loan Bank Advances, by Branch of FHLB Bank [Table] Financial Instruments with Off-balance Sheet Risk Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Effect of Derivative Financial Instruments on Consolidated Statement of Operations Schedule of Short-term Debt [Table] Information Regarding Subordinated Debentures Schedule of Subordinated Borrowing [Table Text Block] Schedule of Stock by Class [Table] Fair Value of Derivative Instruments Loan Portfolios Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Schedule of Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Axis] OPERATING SEGMENTS Operating Segments [Abstract] Segment Reporting [Abstract] Average discount rate Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate Balance at beginning of period Balance at end of year Servicing Asset at Amortized Cost Servicing asset measurement input Servicing Asset, Measurement Input Originated servicing rights capitalized Servicing asset fair value Servicing Asset Balance at end of year Balance at beginning of period Capitalized mortgage loan servicing rights Servicing Asset at Fair Value, Amount Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Average Exercise Price [Roll Forward] Expired (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Share Based Compensation [Abstract] Share-based Payment Arrangement, Noncash Expense [Abstract] Weighted-Average Grant Date Fair Value [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Share based compensation Share-based Payment Arrangement, Noncash Expense Closing price (in dollars per share) Share Price Granted (in shares) Options issued under merger agreement (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Number of additional shares approved for grant (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Forfeited (in dollars per share) Information regarding options exercised [Abstract] Granted (in shares) Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Outstanding, ending balance (in shares) Outstanding, beginning balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Outstanding, beginning balance (in dollars per share) Outstanding, ending balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (in dollars per share) Vested (in dollars per share) Intrinsic value Exercisable, period end (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Exercisable, period end (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Weighted-Average Remaining Contractual Term [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Vested and expected to vest, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Equity Award [Domain] Outstanding, ending balance (in shares) Outstanding, beginning balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Outstanding, beginning balance (in dollars per share) Outstanding, ending balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Outstanding, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Vested and expected to vest, period end (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Vested and expected to vest, period end (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number SHARE BASED COMPENSATION Share based compensation withholding obligation, common stock (in shares) Financial Instruments Subject to Mandatory Redemption, Financial Instrument [Domain] Short-term lease cost Short-term Debt, Type [Domain] Short-term Debt [Line Items] Short-term Debt [Line Items] Short-term Debt [Abstract] Short-term Debt, Type [Axis] ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Standby Letters of Credit [Member] CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION [Abstract] CONDENSED STATEMENTS OF FINANCIAL CONDITION [Abstract] CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract] Equity Components [Axis] Equity Components [Axis] Statement [Line Items] Statement [Table] CONSOLIDATED STATEMENTS OF CASH FLOWS [Abstract] CONDENSED STATEMENTS OF CASH FLOWS [Abstract] CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY [Abstract] Number of shares authorized for repurchase (in shares) Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Share based compensation, common stock (in shares) Issuance of shares of common stock (in shares) Acquisition of TCSB Bancorp, Inc. Issuance of common stock Stock Issued During Period, Value, New Issues Share based compensation Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Stock repurchased (in shares) Repurchase of shares of common stock (in shares) Repurchase of common stock Stock repurchased SHAREHOLDERS' EQUITY AND INCOME PER COMMON SHARE Stockholders' Equity Note Disclosure [Text Block] Balance at beginning of period Balances at end of period Total Shareholders' Equity Total shareholders' equity Shareholders' equity COMMON STOCK Stockholders' Equity, Policy [Policy Text Block] Shareholders' Equity SHAREHOLDERS' EQUITY AND INCOME PER COMMON SHARE [Abstract] SUBORDINATED DEBENTURES [Abstract] SUBORDINATED DEBENTURES Subordinated Borrowings Disclosure [Text Block] Subordinated Borrowing [Table] Subordinated Debentures Subject to Mandatory Redemption [Member] Subordinated Borrowing [Line Items] Subsequent Event [Member] Subsequent Event Type [Domain] Subsequent Event Type [Axis] Increase in income tax expense Tax Cuts and Jobs Act, Change in Tax Rate, Deferred Tax Asset, Income Tax Expense Minimum for Well-Capitalized Institutions, Amount Actual, Ratio Minimum for Adequately Capitalized Institutions, Ratio Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets Tier 1 capital to risk-weighted assets [Abstract] Tier One Risk Based Capital [Abstract] Minimum for Adequately Capitalized Institutions, Ratio Tier One Leverage Capital Required for Capital Adequacy to Average Assets Minimum for Well-Capitalized Institutions, Ratio Tier One Leverage Capital Required to be Well Capitalized to Average Assets Minimum for Adequately Capitalized Institutions, Amount Tier One Leverage Capital Required for Capital Adequacy Tier 1 capital Tier One Leverage Capital Actual, Ratio Tier One Leverage Capital to Average Assets Minimum for Adequately Capitalized Institutions, Amount Tier One Risk Based Capital Required for Capital Adequacy Actual, Amount Tier One Risk Based Capital Minimum for Well-Capitalized Institutions, Ratio Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets Tier 1 capital to average assets [Abstract] Minimum for Well-Capitalized Institutions, Amount Tier One Risk Based Capital Required to be Well Capitalized 2023 Time Deposit Maturities, Year Four 2020 Time Deposit Maturities, Next Twelve Months 2022 Time Deposit Maturities, Year Three 2024 Time Deposit Maturities, Year Five 2021 Time Deposit Maturities, Year Two 2025 and thereafter Time Deposit Maturities, after Year Five Total Deposits with stated maturity Trading Securities, Realized Gain (Loss) Trading Securities, Realized Gain (Loss) Trading Activity [Axis] Trading Activity, by Type [Domain] Transfer of mortgage loans to held for sale Transfer of Portfolio Loans and Leases to Held-for-sale Transfers to other real estate and repossessed assets TRANSFERS OF FINANCIAL ASSETS Financial Instruments [Domain] Troubled Debt Restructurings Trust Preferred Securities Subject to Mandatory Redemption [Member] Trust Preferred [Member] Type of Adoption [Domain] Subjective Allocation [Member] Unallocated Financing Receivables [Member] Balance at end of year Balance at beginning of year Unrecognized Tax Benefits Reductions due to settlements Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Penalties and interest accrued Unrecognized tax benefits of effective tax rate Reductions due to the statute of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Penalties and interest expense Additions based on tax positions related to the current year U.S. Agency [Member] Obligations of States and Political Subdivisions [Member] U.S. Treasury [Member] Valuation Technique [Axis] Valuation Technique [Domain] Variable lease cost Variable Income Interest Rate [Member] Weighted average shares outstanding for calculation of diluted earnings per share (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Counterparty Name [Axis] INDEPENDENT BANK CORPORATION (PARENT COMPANY ONLY) FINANCIAL INFORMATION [Abstract] Condensed Financial Statements, Captions [Line Items] Consolidated Entities [Domain] Consolidated Entities [Axis] Directors [Member] Executive Officers [Member] Customer [Axis] Maximum [Member] Minimum [Member] Mortgage Loans on Real Estate, Loan Type [Domain] Mortgage Loans on Real Estate, Loan Type [Axis] Customer [Domain] Products and Services [Domain] Parent Company [Member] Parent Company [Member] Products and Services [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Statistical Measurement [Axis] Statistical Measurement [Axis] Counterparty Name [Domain] Scenario, Unspecified [Domain] Condensed Statements of Operations Condensed Statements of Financial Condition Condensed Statements of Cash Flows Schedule of Condensed Financial Statements [Table] Single-family Residential Loans [Member] Scenario [Axis] Mepco [Member] Subsidiaries [Member] Relationship to Entity [Domain] Title of Individual [Axis] Weighted Average [Member] The entire disclosure for the components of other non-interest expense. Other Non-interest Income [Text Block] OTHER NON-INTEREST INCOME Effect Of Derivative Financial Instruments On Consolidated Financial Statements Of Operations [Abstract] Effect of derivative financial instruments on the consolidated financial statements of operations [Abstract] Gain on mortgage loans. Net Mortgage Loan Gains [Member] Mortgage Loan Gains [Member] Refers to purchased options relating to Altitude CD product. Purchased Options [Member] Purchased Options [Member] Refers to written options relating to Altitude CD product. Written Options [Member] Written Options [Member] Mandatory commitments to sell mortgage loans derivative financial instrument. Mandatory Commitments to Sell Mortgage Loans [Member] Mandatory Commitments to Sell Mortgage Loans [Member] Primary financial statement caption encompassing non-interest income other. Non-Interest Income Other [Member] Non-Interest Income-Other [Member] Derivative financial instruments according to type of hedge designation. Derivative Financial Instruments According To Type Of Hedge Designation [Table Text Block] Derivative Financial Instruments According to Type of Hedge Designation Refers to the term of cash flow hedge in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Term of Cash Flow Hedge Term of cash flow hedge Amount of premiums on interest rate caps that have not been expensed as of the balance sheet date. Unrecognized Premium on Derivatives Unrecognized premiums Represents the expense recognized during the period arising from compensation arrangements for performance programs with employees, directors and certain consultants qualifying for treatment as employees. Incentive Based Compensation Expense Performance-based compensation expense Expenditures for employee health care and life insurance benefits as provided for compensation. Employee Compensation Benefit Health Care And Life Insurance Expense Health care and life insurance expense This item represents the percentage of contributions during the period made by the entity to the Employee Stock Ownership Plan (ESOP). Employee Stock Ownership Plan E S O P Contributions To E S O P Employee stock ownership plan (ESOP), contributions Maximum percentage of employee gross pay the employer may contribute to a defined contribution plan. Defined Contribution Plan, Maximum Annual Contributions, Employer, Percent Maximum matching contribution, percent Aggregate intrinsic value [Abstract] Aggregate Intrinsic Value [Abstract] Tabular disclosure of the change in real estate valuation allowance. Other Real Estate Valuation Allowance Roll Forward [Table Text Block] Valuation Allowance for Other Real Estate Owned Tabular disclosure of the change in other real estate on properties owned taken in settlement of troubled loans through surrender or foreclosure by banks. Other Real Estate, Roll Acquired Forward [Text Block] Summary of Other Real Estate Activity Tabular disclosure of subordinated debentures and trust preferred securities. Schedule of subordinated debentures and trust preferred securities [Table Text Block] Subordinated Debentures and Trust Preferred Securities Summary of other borrowings [Abstract] The carrying amount on the balance sheet date for the aggregate of borrowings owed by the reporting entity that may include Treasury Tax and Loan or other borrowings not otherwise defined in the taxonomy. Borrowings Other Assets, including available for sale securities, pledged to secure borrowings. Assets Pledged As Collateral Available for sale and loans, pledged to secure other borrowings Federal Reserve Bank Borrowings [Abstract] Federal reserve bank borrowings [Abstract] Refers to the average borrowings amount during the period from the Federal Reserve Bank. Federal Reserve Bank, Average Borrowings Average borrowings Refers to the outstanding amount borrowed during the period from the Federal Reserve Bank. Federal Reserve Bank, Amount Outstanding During Period Borrowings Amount of advances or credit lines available from the Federal Reserve Bank. Federal Reserve Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds Unused borrowing capacity Represents minimum percentage of unpaid principal balance of FHLB advances that needs to be held in the form of federal home loan bank stock. Federal Home Loan Bank Stock As Percentages Of Outstanding Advances FHLB stock as percentages of outstanding advances Represents minimum percentage of unpaid principal balance of residential mortgage loans that needs to be held in the form of federal home loan bank stock. Federal Home Loan Bank Stock As Percentages Of Unpaid Principal Balance FHLB stock as percentages of unpaid principal balance Hair cut percentage used on qualifying mortgage and home equity loan collateral. Federal Home Loan Bank Advances Home Equity Collateral Federal home loan bank, advances, interest rate The weighted average interest rate applicable to the Federal Home Loan Bank advances which are due as of the balance sheet date. Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts As of Balance Sheet Date Total FHLB advances, Rate Refers to federal home loan bank (FHLB) variable interest rate advances. Federal Home Loan Bank, Advances, Variable Rate [Member] Variable-Rate Advances [Member] Refers to federal home loan bank (FHLB) fixed interest rate advances. Federal Home Loan Bank, Advances, Fixed Rate [Member] Fixed-Rate Advances [Member] The denominations amount of aggregate domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $250,000 or more. Time Deposits Denominations Amount Time Deposits denominations amount Summary of reciprocal deposits [Abstract] Summary of reciprocal deposits [Abstract] Amount of reciprocal demand deposits. Reciprocal Demand Deposits Demand The denominations amount of aggregate domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $250,000 or more. Time Deposits, $250,000 or More Aggregate amount of time deposits of $250,000 or more Amount of reciprocal money market deposits. Reciprocal Money Market Deposits Money market Amount of reciprocal time deposits. Reciprocal Time Deposits Time Interest expense incurred on reciprocal deposit liabilities. Interest Expense, Deposit Liabilities, Reciprocal Deposit Reciprocal Total amount of reciprocal deposits . Reciprocal deposits Total Reciprocal The amount of adjustment to stockholders' equity associated with a reclassification of certain deferred tax effects. Adjustments Related to Reclassification of certain deferred tax effects Reclassification of certain deferred tax effects The cash inflow associated with the sale of equity securities. Proceeds From Sale Of Equity Securities Proceeds from the sale of equity securities at fair value The net cash inflow from sale of Interest-bearing Deposits by banks in other financial institutions for relatively short periods of time. Proceeds From Sale Of Interest Bearing Time Deposits Proceeds from the sale of interest bearing deposits - time The cash inflow associated with the collection of vehicle service contract counterparty receivables. Proceeds From The Collection Of Vehicle Service Contract Counterparty Receivables Proceeds from the collection of vehicle service contract counterparty receivables Fair value of equity interests and options issued or issuable to acquire the entity. Business Acquisition, Equity Interest and Options Issued, Fair Value Common stock and stock options issued in TCSB Bancorp, Inc. acquisition Fair value of equity issued under merger agreement Cash Paid During the Period For [Abstract] Cash paid during the year for Purchase of securities available for sale not yet settled. Purchase of securities available for sale not yet settled Purchase of securities available for sale and interest bearing deposits - time not yet settled The net cash inflow or outflow for the (increase) decrease in the beginning and end of period of portfolio loan balances originated net of principal payments. Net (Increase) Decrease of Portfolio Loans, Originated net of Principal Payments Net increase in portfolio loans (loans originated, net of principal payments) Securitization of certain mortgage loans with Freddie Mac . Securitization of Portfolio Loans Securitization of portfolio loans Disclosure of accounting policy for capitalized mortgage loan servicing rights. Capitalized Mortgage Loan Servicing Rights [Policy Text Block] CAPITALIZED MORTGAGE LOAN SERVICING RIGHTS The entire policy disclosure represents an equity interest in the Federal Reserve Bank. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). FEDERAL RESERVE BANK STOCK [Policy Text Block] FEDERAL RESERVE BANK ("FRB") STOCK Disclosure of accounting policy for interest bearing deposits. INTEREST BEARING DEPOSITS [Policy Text Block] INTEREST BEARING DEPOSITS Disclosure of accounting policy for other real estate and repossessed assets. Other Real Estate and Repossessed Assets [Policy Text Block] OTHER REAL ESTATE AND REPOSSESSED ASSETS Disclosure of accounting policy for payment plan receivable revenue recognition. PAYMENT PLAN RECEIVABLE REVENUE RECOGNITION [Policy Text Block] PAYMENT PLAN RECEIVABLE REVENUE RECOGNITION The entire policy disclosure represents an equity interest in the Federal Home Loan Bank. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). Federal Home Loan Bank, Advances Policy Text Block [Policy Text Block] FEDERAL HOME LOAN BANK ("FHLB") STOCK Disclosure of accounting policy for bank owned life insurance. BANK OWNED LIFE INSURANCE [Policy Text Block] BANK OWNED LIFE INSURANCE Mortgage loans held-for-sale carried at lower of cost or fair value. Loans held for sale, carried at lower of cost or fair value Loans held for sale, carried at lower of cost or fair value For banks and other depository institutions: Interest-bearing deposits-time in other financial institutions with maturities of more than three months including, for example, certificates of deposits, which are presented separately from cash on the balance sheet. Interest bearing deposits time Interest bearing deposits - time Portfolio segment of the company's total financing receivables related to installment financing receivables. Installment Portfolio Segment [Member] Installment [Member] The change in unrealized gains for which a portion of other than temporary impairment has been recognized in earnings before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities. Other Comprehensive Income (Loss), Available-for-sale Securities, Other Than Temporary Impairment Loss Adjustment, before Reclassification Adjustments and Tax Change in unrealized gains and losses for which a portion of other than temporary impairment has been recognized in earnings Expenses generally relating to the origination of loans (not subject to capitalization), the collection of loans and maintaining other real estate and repossessed assets. Loan And Collection Loan and collection Amount of expense related to debit card transactions. Interchange Expense Interchange expense The amount of expenses incurred in the period for data processing services and related costs. Data Processing Data processing Represents interchange fees earned on debit card transactions. Interchange Income Interchange income Includes amounts charged depositors for: (1) maintenance of their accounts (maintenance charges); (2) failure to maintain specified minimum balances on account; (3) exceeding the number of checks or transactions allowed to be processed in a given period; (4) checks drawn on no minimum balance deposit accounts; (5) withdrawals from nontransaction deposit accounts; (6) closing savings accounts before a specified minimum period of time has elapsed; (7) accounts which have remained inactive for extended periods of time or which have become dormant; (8) checks drawn against insufficient funds that the bank assesses regardless of whether it decides to pay, return or hold the check; (9) issuing stop payment orders; (10) certifying checks. This item does not include penalties assessed on the early withdrawal of time deposits. Depositor Accounts, Fees and Commissions Service charges on deposit accounts Income from servicing real estate mortgages held by others net of any related impairment of capitalized service costs. Mortgage Loan Servicing Income Mortgage loan servicing, net Tabular disclosure of maturity of time deposits. Summary of maturity of time deposits [Table Text Block] Summary of Maturity of Time Deposits Tabular disclosure of summary of reciprocal deposits. Summary of reciprocal deposits [Table Text Block] Summary of Reciprocal Deposits Tabular disclosure of interest expense on deposits. Summary of interest expense on deposits [Table Text Block] Summary of Interest Expense on Deposits Subsidiaries trust which is controlled, directly or indirectly, by its parent. The usual condition for control is ownership of a majority (over 50%) of the outstanding voting stock. The power to control may also exist with a lesser percentage of ownership, for example, by contract, lease, agreement with other stockholders or by court decree. Subsidiaries Trust Two [Member] IBC Capital Finance III [Member] Subsidiaries trust which is controlled, directly or indirectly, by its parent. The usual condition for control is ownership of a majority (over 50%) of the outstanding voting stock. The power to control may also exist with a lesser percentage of ownership, for example, by contract, lease, agreement with other stockholders or by court decree. Subsidiaries Trust Five [Member] TCSB Statutory Trust I [Member] Summary of subordinated debentures and trust preferred securities [Abstract] Subsidiaries trust which is controlled, directly or indirectly, by its parent. The usual condition for control is ownership of a majority (over 50%) of the outstanding voting stock. The power to control may also exist with a lesser percentage of ownership, for example, by contract, lease, agreement with other stockholders or by court decree. Subsidiaries Trust Four [Member] Midwest Guaranty Trust I [Member] Subsidiaries trust which is controlled, directly or indirectly, by its parent. The usual condition for control is ownership of a majority (over 50%) of the outstanding voting stock. The power to control may also exist with a lesser percentage of ownership, for example, by contract, lease, agreement with other stockholders or by court decree. Subsidiaries Trust Three [Member] IBC Capital Finance IV [Member] For an issue of Subordinated Debentures, maximum distribution deferral period (payments of interest). Distribution Deferral Period Subordinated Debentures Distribution deferral period, maximum quarters Summary of information regarding subordinated debentures [Abstract] Aggregate stated amount of common stock issued by trusts. Common Stock Issued By Trust Common Stock Issued Including the current and noncurrent portions, the carrying value of preferred securities trust that embody an unconditional obligation requiring the issuer to redeem the securities by transferring the funds at a specified or determinable date (or dates) or upon an event that is certain to occur, that are issued by a consolidated trust to outside investors where the trust uses the proceeds of the issuance of those securities to purchase, from the financial institution that established the trust on balance sheets date. Trust Preferred Securities Trust preferred securities Date when the debt instrument is scheduled to be redemption, in CCYY-MM-DD format. Debt Instrument Redemption Date First Permitted Redemption Date Represents the shares issued on a deferred basis are credited at the rate of current value and vest immediately. Shares Issued on Deferral Basis Credited Percentage of Current Value Shares issued on deferral basis credited percentage of current value Number of new stock units or restricted shares issued during the period. Stock Units Or Restricted Shares Issued During Period Number of restricted stock units issued to executive officers (in shares) Share issued to directors in place of quarterly cash retainer's fees during the period. Shares issues in place of retainer fees Shares issues as retainer fees (in shares) The entity's equity-based compensation arrangement plan. Long-Term Incentive Plan [Member] Long-Term Incentive Plan [Member] Person serving on the board of directors (who collectively have responsibility for governing the entity), but are non employees. Non Employee Directors [Member] Non-Employee Directors [Member] Bank is required to maintain reserve balances in the form of vault cash and non-interest earning balances with the FRB. The amount refers to average reserve balances to be maintained. Average reserve balances to be maintained Average reserve balances maintained Cash balances held related to investment security transactions and merchant payment processing operations. Reserve balances related to investment security transactions and merchant payment processing operations Reserve balances related to investment security transactions and merchant payment processing operations The value of the number of shares held at close of period. Investment Owned, Balance, Shares Value Current value of shares owned Ratio applied to the conversion of one type or class of equity instrument into another type or class of equity instrument. Equity Investment, Conversion Ratio Current conversion ratio Fair Value, Off-balance Sheet Risks [Abstract] Fair Value, Off-balance Sheet Risks [Abstract] The contract value of financial standby letters of credit, which are not recognized in the financial statements (off-balance sheet). Contract Disclosure Off Balance Sheet Risks Amount Financial instruments risk represented by contract amounts Refers to variable rate on standby letters of credit. Contract Disclosure Off Balance Sheet Risks Liability Variable Rate Variable interest rate Reserve balance as of the reporting date for loss reimbursements on sold mortgage loans. Reserve For Loss Reimbursement On Sold Loans Loss reimbursement reserve on sold mortgage loans Refers to TCSB Bancorp, Inc. an entity entered into merger agreement with the company. TCSB Bancorp, Inc. [Member] TCSB Bancorp, Inc. [Member] Non interest provision for loss reimbursement on sold loans. Provision for loss reimbursement on sold loans Loss reimbursement on sold loans Stock that is subordinate to all other stock of the issuer. VISA Class A Stock [Member] VISA Class A Common Stock [Member] Classification of common stock representing ownership interest in a corporation. VISA Class B [Member] VISA Class B Common Stock [Member] Estimated recorded book balance and fair value [Abstract] Estimated recorded book balances and fair values [Abstract] Total amount of reciprocal deposits included in deposits with stated maturity. Reciprocal Deposits Included In Deposits With Stated Maturity Reciprocal deposits included in deposits with stated maturity Total amount of reciprocal deposits included in deposits with no stated maturity. Reciprocal Deposits Included in Deposits with No Stated Maturity Reciprocal deposits included in deposits with no stated maturity For banks and other depository institutions: Fair value disclosure of Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet, interest-bearing balances with the Federal Reserve Banks. Interest Bearing Deposits With Banks, Fair Value Disclosure Interest bearing deposits This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents all loans held for investment, net of related allowance and loans held-for-sale as presented on the statement of financial position as of the balance sheet date. Net Loans And Loans Held For Sale Fair Value Disclosure Net loans and loans held for sale Fair value portion of banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks. Cash and Due from Banks, Fair Value Disclosure Cash and due from banks Amount of all domestic deposit liabilities with no stated maturity. Domestic Deposit Savings No Stated Maturity Deposits with no stated maturity Financing receivables that have been classified as troubled debt restructurings during the period. Troubled Debt Restructurings During Period [Table Text Block] Troubled Debt Restructuring During the Period Tabular disclosure of average recorded investment in and interest income earned on impaired loans by class. Average recorded investment in and interest income earned on impaired loans by class [Table Text Block] Average Recorded Investment in and Interest Income Earned on Impaired Loans by Class Tabular disclosure of troubled debt restructuring that subsequently defaulted. Troubled debt restructuring during the past twelve months that subsequently defaulted [Table Text Block] Troubled Debt Restructuring During the Past Twelve Months that Subsequently Defaulted Tabular disclosure of other mortgage loans service's principal balances. Schedule of Other Mortgage Loans Services Principal Balances [Table Text Block] Other Mortgage Loans Service's Principal Balances Tabular disclosure of an analysis of capitalized mortgage loan servicing rights. Schedule of capitalized mortgage loan servicing rights [Table Text Block] Analysis of Capitalized Mortgage Loan Servicing Rights The cumulative amount of the subsidiary reporting entity's undistributed earnings or deficit. Retained Earnings Accumulated Deficit Subsidiary Undivided profits Common Equity Tier 1 Capital divided by risk weighted assets as defined by regulations. Common Equity Tier One Capital To Risk Weighted Assets Actual, Ratio The Common Equity Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. Common Equity Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Minimum for Well-Capitalized Institutions, Ratio Components of regulatory capital [Abstract] Components of regulatory capital [Abstract] Allowance for loan losses and allowance for unfunded lending commitments included in total risk-based capital. Allowance For Loan Losses And Unfunded Lending Commitments Limited At Specific Risk Weighted Assets Allowance for loan losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets Deferred tax assets not qualifying as Tier 1 capital. Disallowed Deferred Tax Assets, Tier 1 Capital Disallowed deferred tax assets Trust preferred securities qualifying as Tier 1 capital. Qualifying Trust Preferred Securities Qualifying trust preferred securities Add (deduct) [Abstract] Add (deduct) [Abstract] Deferred tax assets not qualifying as common equity Tier 1 capital. Disallowed Deferred Tax Assets Disallowed deferred tax assets A component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. Independent Bank [Member] Independent Bank [Member] The minimum Common Equity Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. Common Equity Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Minimum for Adequately Capitalized Institutions, Ratio Refers to the percentage points added to the minimum ratio for adequately capitalized institutions. Conservation Buffer, Percentage Points Added to Minimum Ratio for Adequately Capitalized Institutions Capital conservation buffer Tabular disclosure of private label residential mortgage backed securities below investment grade that had credit related OTTI. Schedule Of Private Label Residential Mortgage Backed Securities Below Investment Grade With Credit Related OTTI [Text Block] Private Label Mortgage Backed Securities Below Investment Grade Portfolio segment of the company's total financing receivables related to real estate receivables. Real Estate Portfolio Segment [Member] Real Estate [Member] Portfolio segment of the company's total financing receivables related to agriculture receivables. Agriculture Portfolio Segment [Member] Agricultural [Member] Portfolio segment of the company's total financing receivables related to commercial receivables that do not include loans from the commercial real estate portfolio segment. Commercial Loan Portfolio Segment, Excluding Real Estate Portfolio Segment [Member] Commercial [Member] Loan to purchase or refinance residential real estate (for example, but not limited to, a home) in which the interest rate is and the amount of each payment remain constant throughout the life of the loan and loans in which the interest rate is periodically adjusted according to changes in a specified reference rate. Fixed Rate Residential Mortgage and Adjustable Rate Residential Mortgage [Member] Residential Mortgage Fixed and Adjustable Rate Mortgage [Member] Loans to fund construction and land development. Construction And Land Improvements [Member] Construction and Land Development [Member] Residential home equity and other junior mortgages. Residential home equity and other junior mortgages [Member] Residential Home Equity and Other Junior Mortgages [Member] Refers to the other real estate of loan portfolios. Other Real Estate [Member] Other [Member] Other Real Estate [Member] Schedule itemizing specific types of notes receivable serviced for others. May include for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Schedule of Loans and Financing Receivables Serviced For Others [Table] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Schedule of Loans and Financing Receivables Serviced For Others [Line Items] The average coupon rate used to estimate the fair value of servicing assets and servicing liabilities. Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Average Coupon Rate Average coupon rate Mortgage Loans Serviced For Others [Abstract] Mortgage loans serviced for others [Abstract] Refers to maximum percentage of decline in net worth for two consecutive quarters. Maximum percentage of decline in net worth for two consecutive quarters Maximum percentage of decline in net worth for two consecutive quarters This is the principal amount outstanding for mortgage loans serviced for others. Principal Amount Outstanding On Loans Serviced For Others Mortgage loans serviced Refers to maximum percentage of decline in net worth for one consecutive quarter. Maximum percentage of decline in net worth for one consecutive quarter Maximum percentage of decline in net worth for one consecutive quarter Refers to percentage of decline in net worth during the period for profitability requirement. Percentage of decline in net worth during the period Percentage of decline in net worth during the period The average servicing fee rate used to estimate the fair value of servicing assets and servicing liabilities. Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Average Servicing Fee Rate Average servicing fee Refers to maximum number of consecutive quarterly losses recorded for profitability requirement. Maximum number of consecutive quarterly losses recorded for profitability requirement Maximum number of consecutive quarterly losses recorded for profitability requirement The average PSA rate used to estimate the fair value of servicing assets and servicing liabilities. Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate, Average PSA Rate Average PSA Rate Analysis of capitalized mortgage loan servicing rights [Abstract] Analysis of capitalized mortgage loan servicing rights [Abstract] Amount of increase (decrease) in fair value of servicing assets due to changes in price. Servicing Asset at Fair Value, Changes In Fair Value Due to Price Change in fair value due to price Amount of increase (decrease) in fair value of servicing assets due to pay downs. Servicing Asset at Fair Value, Changes in Pay Downs Change in fair value due to pay downs The carrying amount of mortgage loans on real estate that were being serviced for others at period end. Mortgage Loans On Real Estate Serviced Loans sold and serviced that have had servicing rights capitalized Amount of increase (decrease) to contract to service financial assets due to a change in accounting. Servicing Asset at Amortized Cost, Change in Accounting Change in accounting (see note #1) Refers to the required amount of highest level of capital need to maintain. Highest Level of Capital Amount Highest level of capital, Amount Refers to Mortgage loans serviced for Freddie Mac. Freddie Mac [Member] Freddie Mac [Member] Refers to loans serviced for the federal home loan bank (FHLB). Federal Home Loan Bank (FHLB) [Member] FHLB [Member] Refers to other mortgage loans serviced. Other Mortgage loans serviced [Member] Other [Member] Refers to Mortgage loans serviced for Fannie Mae. Fannie Mae [Member] Fannie Mae [Member] Refers to Mortgage loans serviced for Ginnie Mae. Ginnie Mae [Member] Ginnie Mae [Member] Adjusted amortized amount of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. Servicing Asset at Amortized Cost, Adjustment Balance at beginning of period, as adjusted Refers to additional required amount of capital required to be maintained as a percent of loans serviced. Highest Level Of Capital Amount Plus Highest level of capital The value of servicing assets acquired during the current period through an acquisition. Servicing Rights Acquired Servicing rights acquired Director and officer ownership percentage exceeding a specific percentage amount. Percentage Of Voting Interest Owned By Related Party Related party entity ownership percentage Amount of gain (loss) realized from securities related to preferred stock classified as trading. Trading Securities Realized Gain Loss, Preferred Stock Gains (losses) related to preferred stock held for sale Percentage of consolidated shareholders' equity to compare against investment obligations of state and political subdivisions. State And Political Subdivision Shareholders' Equity Threshold Shareholder equity threshold not exceeded by revenue or taxing authority amount The net book value of securities were pledged to secure borrowings, public deposits and for other purposes as required by law. Book Value Of Pledged Securities Pledged securities with book value Number of equity securities sold. Number of Securities Sold, Equity Securities Number securities sold (in shares) Tabular disclosure of the detailed components of other noninterest income. May include methodology, assumptions and amounts for noninterest income items. Schedule of other non-interest income [Table Text Block] Other Non-interest Income Concentration of credit risk to accommodation and food services. Accommodation and Food Services [Member] Accommodation and Food Services [Member] Refers to concentration of credit risk to lessor nonresidential real estate. Lessors of Nonresidential Real Estate [Member] Refers to concentration of credit risk to manufacturing. Manufacturing [Member] Refers to concentration of credit risk to lessor residential real estate. Lessors of Residential Real Estate [Member] Refers to concentration of credit risk to health care and social assistance. Health Care and Social Assistance [Member] Refers to concentration of credit risk to construction and development loans. Construction and Development Loans [Member] Investment and insurance commissions include fees and commissions from asset management, custody, recordkeeping, investment advisory and other services provided to our customers. Investment and Insurance Commissions Investment and insurance commissions Amount of other non-interest income which are not separately presented in any other noninterest income category. Other Miscellaneous Non Interest Income Other Amount of income earned from ATM cards. Fees ATM Cards ATM fees Shares that an entity has not yet issued because the agreed-upon consideration, such as employee services, has not yet been received and shares or units awarded to employees for meeting certain performance targets. Non Vested Restricted Stock and Performance Stock Units [Member] Non-vested Restricted Stock and PSU's [Member] Refers to number of weighted average performance stock units. Weighted Average Number Of Performance Shares Stock Performance share units (in shares) Number of stock units for deferred compensation plan for non employee directors determined by relating the portion of time within a reporting period that restricted shares have been outstanding to the total time in that period. Stock Units For Deferred Compensation Plan For Non Employee Directors Stock units for deferred compensation plan for non-employee directors (in shares) Earnings Per Share, Antidilutive Disclosures [Abstract] Antidilutive Securities [Abstract] Stock Repurchase Program [Abstract] Share Repurchase Plan [Abstract] The percentage share authorized to be repurchased under a stock repurchase plan. Stock Repurchase Program Percentage Of Shares Authorized To Be Repurchased Share repurchase plan percentage of shares authorized to be repurchased Class of financing receivables related to 1-4 family owner occupied jumbo financing receivables. Family 1 4, Owner Occupied, Jumbo [Member] 1-4 Family Owner Occupied - Jumbo [Member] Class of financing receivables related to recreational vehicle lending financing receivables. Recreational Vehicle Lending [Member] Recreational Vehicle Lending [Member] Class of financing receivables related to 1-4 family owner occupied non-jumbo financing receivables. Family 1 4, Owner Occupied, Non-jumbo [Member] 1-4 Family Owner Occupied - Non-jumbo [Member] Class of financing receivables related to boat lending financing receivables. Boat Lending [Member] Boat Lending [Member] Loan to finance the purchase of commercial real estate, including but not limited to, land or building. Commercial Real Estate Loan [Member] Commercial Real Estate [Member] Class of financing receivables related to 1-4 family second lien financing receivables. Family 1 4, Second Lien [Member] 1-4 Family - 2nd Lien [Member] Class of financing receivables related to other installment financing receivables. Installment Other [Member] Other [Member] Other [Member] Troubled Debt Restructuring [Abstract] Troubled Debt Restructuring [Abstract] The period when loan payment is considered to be in default. Past due period for modified loans Past due period for modified loans Period of time an interest rate is modified for in a troubled debt restructuring. Financing Receivable Modifications Of Stated Interest Rate Period Modification of stated interest rate of loans, range of period Amount of increase (decrease) in the allowance for doubtful accounts due to TDR's that subsequently defaulted. Allowance For Doubtful Accounts Receivable Period Increase Decrease Due To T D R Increase (decrease) in allowance for loan loss due to TDRs that subsequently defaulted Disclosure of troubled debt restructurings. Troubled debt restructuring Troubled debt restructuring Amount of direct write-downs of receivables charged against the allowance for doubtful accounts due to TDR's that subsequently defaulted. Allowance For Doubtful Accounts Receivable Charge Offs Due To T D R Charge-offs on TDRs that subsequently defaulted Loans classified as troubled debt restructurings [Abstract] Loans classified as troubled debt restructurings [Abstract] Period of time an interest rate is modified for in a troubled debt restructuring in certain circumstances. Financing Receivable Modifications Of Stated Interest Rate Period, Extension Modification of stated interest rate of loans, range of period in certain circumstances Period of time the maturity date of a troubled debt restructured loan is extended for. Financing Receivable Modifications Of Maturity Date Modifications involving extension of maturity date, period range Refers to additional amounts committed to lend to customers with outstanding loans that are classified as troubled debt restructurings. Additional amounts committed to lend as troubled debt restructurings Additional amounts committed to lend as troubled debt restructurings Period of time the maturity date of a troubled debt restructured loan is extended for in certain circumstances. Financing Receivable Modifications Of Maturity Date, Extension Modifications involving extension of maturity date, period range in certain circumstances Specific allowance for loan and lease losses on receivable financings that are classified as troubled debt restructurings. Troubled Debt Restructuring Loans and Leases Receivable Specific allowance Troubled debt restructuring, specific reserve The number of consecutive timely payments required to be received for non-accrual loans to be removed from inclusion with the non-performing troubled debt restructurings. Number of Consecutive Timely Payments Required Number of consecutive timely payments required TDR that subsequently defaulted [Abstract] Class of financing receivables related to commercial and industrial financing receivables. Commercial and Industrial [Member] Commercial and Industrial [Member] Class of financing receivables related to 1-4 family non-owner occupied financing receivables. Family 1 4, Non-owner Occupied [Member] 1-4 Non-owner Occupied [Member] 1-4 Family Non-owner Occupied [Member] Class of financing receivables related to resort lending financing receivables. Resort Lending [Member] Resort Lending [Member] Single retail external customer or group of external retail customers. Customer, Retail [Member] Retail [Member] Revenues are earned on depository accounts for commercial and retail customers and include fees for transaction-based, account maintenance and overdraft services. Service Charges on Deposits [Member] Service Charges on Deposit Accounts The number of real estate assets financed by the entity sold during the period. Number of Real Estate Assets Sold Number of real estate assets sold during the period Revenues are earned on depository accounts for commercial and retail customers and include fees for transaction-based, account maintenance services. Account Service Charges [Member] Account Service Charges [Member] The percentage of the entity's revenue excluded from the scope of ASU 2014-09. Percentage of Revenue Excluded from ASU 2014-09 Percentage of revenues excluded from ASC Topic 606 Transaction-based fees, which includes services such as ATM use fees, stop payment charges and ACH fees are recognized at the time the transaction is executed as that is the time we fulfill our customer's request. Account maintenance fees, which includes monthly maintenance services are earned over the course of a month representing the period over which the performance obligation is satisfied. Other Deposit Related Income [Member] Other Deposit Related Income [Member] Other deposit related income. Other [Member] Other [Member] Transaction-based fees, which includes services such as ATM use fees. ATM Fees [Member] ATM Fees [Member] Investment and insurance commissions include fees and commissions from asset management, custody, recordkeeping, investment advisory and other services provided to our customers. Revenue is recognized on an accrual basis at the time the services are performed and are generally based on either the market value of the assets managed or the services provided. Investment and Insurance Commissions [Member] Investment and Insurance Commissions [Member] Investment and insurance commissions include fees and commissions from asset management, custody, recordkeeping, investment advisory and other services provided to our customers. Asset Management Revenue [Member] Asset Management Revenue [Member] Transaction-based fees, which includes services such as ATM use fees, stop payment charges and ACH fees are recognized at the time the transaction is executed as that is the time we fulfill our customer's request. Transaction Based Revenue [Member] Transaction Based Revenue [Member] Revenues are earned on depository accounts for commercial and retail customers and include fees for overdraft services. Overdraft Fees [Member] Overdraft Fees [Member] Interchange income primarily includes debit card interchange and network revenues. Interchange Income [Member] Interchange Income [Member] Single external business customer or group of external customers. Customer, Business [Member] Business [Member] Income classified as other excluding interest income. Noninterest Income, Other Operating Income, Other Other Class of financing receivables related to 1-4 family financing receivables. Family 1 4 [Member] Mortgage Loans [Member] Carrying amount of other real estate that are impaired, net reserves. Other Real Estate Impaired, Net Reserves Other real estate, carrying amount Loans which are measured for impairment using the fair value of collaterals. Collateral dependent loans, carrying amount Collateral dependent loans, carrying amount The valuation allowance on loans measured for impairment, using the fair value of collaterals. Collateral dependent loans, valuation allowance Collateral dependent loans, valuation allowance Refers to the capitalized mortgage loan servicing rights. Capitalized Mortgage Loan Servicing Rights [Member] Mortgage Loan Servicing, Net [Member] Capitalized Mortgage Loan Servicing Rights [Member] Amount of unrealized gain (loss) on loans held for sale measured at fair value with change in fair value recognized in net income. Loans Held-for-sale, Unrealized Gain Loss Loans held for sale, net gains (losses) Amount of unrealized gain (loss) on capitalized servicing rights measured at fair value with change in fair value recognized in net income. Servicing Asset, Unrealized Gain Loss Capitalized mortgage loan servicing rights, net gains (losses) Amount of unrealized gain (loss) on investment in trading security measured at fair value with change in fair value recognized in net income. Trading Securities Unrealized Gain Loss Trading securities, net gains (losses) Loan ratings/credit scores by loan class [Abstract] Total recorded investments by credit score. Credit score by investment Total Represents the FICO score of loans by category. Credit score 700 to 749 700-749 Represents the FICO score of loans by category. Credit score Under 500 Under 500 Represents the FICO score of loans by category. Credit score 600 to 649 600-649 Represents the FICO score of loans by category. Credit score 750 to 799 750-799 Represents loans categorized as unknown when the FICO credit score is not known. Credit Score Unknown Unknown Represents the FICO score of loans by category. Eight hundreds and above 800 and above Represents the FICO score of loans by category. Credit score 650 to 699 650-699 Represents the FICO score of loans by category. Credit score 550 to 599 550-599 Represents the FICO score of loans by category. Credit score 500 to 549 500-549 Class of financing receivables related to loans not secured by real estate financing receivables. Loans Not Secured By Real Estate [Member] Loans Not Secured By Real Estate [Member] PCI loans contractually required payments would not be collected [Abstract] Average recorded investment in and interest income earned on impaired loans by class [Abstract] Average recorded investment in and interest income earned on impaired loans by class [Abstract] Amount of allowance for loan losses allocated [Abstract] Amount of allowance for loan losses allocated [Abstract] Troubled debt restructured allowance based on present value cash flow. Troubled Debt Restructuring Allowance Based on Present Value Cash Flow TDR - allowance based on present value cash flow Total amount of allowance for loan losses allocated Allowance For Loan Losses Allocated Total amount of allowance for loan losses allocated Accrued total interest included in recorded investment in impaired loans at period end. Accrued Interest, Impaired Loans Accrued interest included in recorded investment Impaired loans with an allocated allowance for loan losses [Abstract] Impaired loans with an allocated allowance for loan losses [Abstract] Non-troubled debt restructured, allowance based on collateral. Non Troubled Debt Restructuring Allowance Based on Collateral Non - TDR - allowance based on collateral Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. Impaired Financing Receivables Total impaired loans Troubled debt restructured allowance based on collateral. Troubled Debt Restructuring Allowance Based on Collateral TDR - allowance based on collateral Impaired loan with no allocated allowance [Abstract] Impaired loan with no allocated allowance for loan losses [Abstract] Amount of unpaid principal balance of impaired financing receivables that are not trouble debt restructured for which there is no related allowance for credit losses. Non Troubled Debt Restructuring Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance Non - TDR Amount of troubled debt restructurings. Troubled Debt Restructuring, Amount TDR Amount of allowance for credit losses related to recorded investment for which there is no related allowance for credit losses. Impaired Financing Receivable Related Allowance With No Related Allowance With no related allowance for loan losses recorded Non-troubled debt restructured allowance based on collateral. Non Troubled Debt Restructuring Allowances Based On Collateral Non - TDR - allowance based on collateral Troubled debt restructured with allowance based on the collateral Troubled Debt Restructuring Allowances Based on Collateral TDR - allowance based on collateral Troubled debt restructured, allowance based on present value cash flow. Troubled Debt Restructuring Allowances Based on Present Value Cash Flow TDR - allowance based on present value cash flow Represents the difference between the aggregate fair value and aggregate remaining contractual principal balance for loans held for sale Difference In Aggregate Fair Value And Aggregate Remaining Contractual Principal Balance For Loans Held For Sale [Table Text Block] Aggregate Fair Value and Aggregate Remaining Contractual Principal Balance for Loans Held for Sale Sum of operating profit and nonoperating income or expense before equity in undistributed net loss of subsidiaries. Income Loss from Continuing Operations Before Equity in Undistributed Net Loss of Subsidiaries Income Before Equity in Undistributed Net Income of Subsidiaries Dividends paid to the parent company by its wholly owned subsidiary. Dividends From Subsidiary Dividends from subsidiary The net cash outflow for the purchase of Interest-bearing Deposits-Time by banks in other financial institutions with maturities greater than three months including, for example, certificates of deposits. Payments For In Interest Bearing Deposits In Banks Time Purchases of interest bearing deposits - time Fair Value Assets Measured On Recurring Basis Gain Loss Realized And Unrealized [Abstract] Total losses realized and unrealized [Abstract] The amount of increase (decrease) from a change in accounting in assets measured on a recurring basis using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Fair Value, Measurement with Unobservable Inputs, Change in Accounting, Recurring Basis, Asset Value Change in accounting MEPCO SALE [Abstract] Disclosure for payment plan receivables and other assets held for sale. Mepco Sale [Text Block] MEPCO SALE Refers to percentage of loan portfolio which was secured by real estate as on balance sheet date. Percentage of loan portfolio secured by real estate Percentage of loan portfolio secured by real estate Number of consecutive payments for mortgage loans and the borrower's capacity to repay the loan and collateral values appear insufficient for each loan class. Number of consecutive payments for mortgage loans misses Number of past due days for commercial loan, installment loans and payment plan receivables when accrual of interest income is discontinued. Number of past due days for commercial loan, installment loans and payment plan receivables Number of past due days for commercial loan, installment loans and payment plan receivables A plan offered by a corporation that allows investors to reinvest their cash dividends by purchasing additional shares or fractional shares on the dividend payment date. Dividend Reinvestment Plan [Member] A reward system designed to improve employees' long-term performance by providing rewards that may not be tied to the entity's share price. long term incentive plans [Member] Long-Term Incentive Plans [Member] Bank Owned Life Insurances [Abstract] Bank Owned Life Insurance [Abstract] Number of lives of group flexible premium non-participating variable life insurance contract that the company purchased. Group Flexible Premium Non-Participating Variable Life Insurance Contract Number of lives of group flexible premium non-participating variable life insurance contract Mortgage Loan Servicing Rights [Abstract] Mortgage Loan Servicing Rights [Abstract] Fees from servicing mortgage loans that have been sold. Mortgage Loan Servicing Fees Mortgage loan servicing fees Other Intangible Assets [Abstract] Other Intangibles [Abstract] Loan Revenue Recognition [Abstract] Property, Plant and Equipment, Useful Life [Abstract] Property, Plant and Equipment, Useful Life [Abstract] Finite Lived Intangible Asset Useful Life [Abstract] Finite Lived Intangible Asset Useful Life [Abstract] Reserved for Future Issuance [Abstract] Reserved for Future Issuance [Abstract] Represents the present value of net servicing revenue used to measure fair value. Present Value of Net Servicing Revenue [Member] Present Value of Net Servicing Revenue [Member] Represents the other real estate mortgage. Other Real Estate Mortgage [Member] Other Real Estate Mortgage [Member] Unobservable Inputs Weighted Average [Abstract] Ranges and Weighted Average [Abstract] Value of input used to measure investment in impaired loans measured at fair value. Impaired Loans, Measurement Input Impaired loans measurement input The amount of impaired collateral dependent that is primarily secured by other than real estate. Impairment Collateral Dependent Other Than Real Estate Total Impaired collateral value Fair value amount of other real estate taken in settlement of troubled loans through surrender or foreclosure. Real Estate, Other Other real estate fair value Amount of investment in impaired loans measured at fair value. Impaired Loans, Fair Value Impaired loans fair value The interest rate in the range of rates estimated at which the discount was computed. Discount Rate Discount rate Represents the impaired loans mortgage loans. Impaired Loans Mortgage [Member] Impaired Loans Mortgage [Member] Represents the sales comparison approach to measure fair value. Sales comparison approach [Member] Sales Comparison Approach [Member] Represents the impaired loans commercial. Impaired Loans Commercial [Member] Impaired Loans Commercial [Member] Represents impaired mortgage and installment other real estate. Other Real Estate Mortgage and Installment [Member] Measurement input using float rate to determine fair value. Measurement Input, Float Rate [Member] Float Rate [Member] Measurement input using cost to service to determine present value of future cash flows. Measurement Input, Cost to Service Approach [Member] Cost to Service [Member] Represents the impaired loans mortgage and installment loans. Impaired Loans Mortgage and Installment [Member] Impaired Loans Mortgage and Installment [Member] Value of input used to measure real estate owned by financial institution by financial institution. Other Real Estate, Measurement Input Other real estate measurement input Measurement input using ancillary income to determine present value of future cash flows. Measurement Input, Ancillary Income [Member] Ancillary Income [Member] Amount of subordinated debentures assumed at the acquisition date. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures Subordinated debentures Amount of accrued income and other assets acquired in the acquisition. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accrued Income and Other Assets Accrued income and other assets Amount of capitalized mortgage loan servicing rights acquired in the acquisition. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Capitalized Mortgage Loan Servicing Rights Capitalized mortgage loan servicing rights Amount of investments in available-for-sale securities assumed at the acquisition date. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Available-for-sale Securities Securities available for sale Amount of other borrowing liabilities at the acquisition date. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Borrowings Other borrowings Amount of deposit liabilities at the acquisition date. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposit Liabilities Deposits Amount of loans acquired in the acquisition. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Acquired Loans, net Number of shares of equity interest of acquirer issued to each holder of common stock of the acquiree in a business acquisition. Business Acquisition Equity Interest Issued, Number of Shares Equity interest issued to each holder of common stock under merger agreement (in shares) Total amount of cash paid in lieu of fractional shares to each holder of common stock of the acquiree in a business acquisition. Business Combination, Consideration Transferred, Cash in Lieu of Fractional Shares Total value of common stock and cash paid in lieu of fractional shares Amount of accrued expenses and other liabilities as of acquisition date. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accrued Expenses and Other Liabilities Accrued expenses and other liabilities Amount of interest bearing time deposits, acquired at the acquisition date. Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed Interest Bearing Time Deposits Interest bearing deposits - time Amount of federal home loan bank stock acquired in the acquisition. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Federal Home Loan Bank Stock Federal Home Loan Bank stock Amount of contractually required payments receivable at acquisition of acquired loans not accounted for as debt securities without evidence of deterioration of credit quality. Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition Gross contractual amounts receivable Amount of other intangible assets, excluding goodwill, acquired at the acquisition date. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Intangible Assets, Other than Goodwill Other intangibles Fair value at acquisition of acquired loans not accounted for as debt securities without evidence of deterioration of credit quality. Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value Fair value of acquired receivables Impaired loans [Abstract] Impaired loans [Abstract] Capitalized mortgage loan servicing rights, fair value disclosure. Capitalized Mortgage Loan Servicing Rights Fair Value Disclosure. Capitalized mortgage loan servicing rights Class of assets, impaired loans. Impaired Loans [Member] Impaired Loans [Member] Disclosure of information related to payment plan receivables and other assets held for sale. Payment Plan Receivables And Other Assets Held For Sale [Table] Line items represent information related to payment plan receivables and other assets held for sale. Payment Plan Receivables And Other Assets Held For Sale [Line Items] Asset Purchase Agreement [Abstract] Asset Purchase Agreement [Abstract] Refers to liabilities assumed related to the sale of the payment plan receivable processing business. Payment Plan Receivable, Liabilities Assumed Liabilities assumed Refers to furniture and equipment related to the sale of the payment plan receivables processing business. Payment Plan Receivable Furniture and Equipment Furniture and equipment Represents carrying amount of vehicle service contract payment plans purchased from counterparties, net of discount. Payment Plan Receivables Net payment plan receivables Refers to certain other assets related to the sale of the payment plan receivables processing business. Payment Plan Receivable Certain Other Assets Other assets Portfolio segment of the company's total financing receivables related to payment plan receivable financing receivables. Payment Plan Receivable Portfolio Segment [Member] Payment Plan Receivables [Member] Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. This amount includes accrued interest. Excludes loans and leases covered under loss sharing agreements. Loans And Leases Receivable Recorded Investment Total loans recorded investment Loans Allowance for loan losses [Abstract] Allowance for loan losses [Abstract] A valuation allowance for certain loans acquired in transfer not accounted for as debt securities that are expected to be uncollectible. Financing Receivable Allowance For Credit Losses, Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Loans acquired with deteriorated credit quality Additions (deductions) [Abstract] Additions (deductions) [Abstract] Reclassification Adjustment, Accumulated Other Comprehensive Income [Abstract] Reclassifications out of AOCL [Abstract] The expected increase to the allowance for losses related to unfunded loan commitments. Expected Increase to Allowance for Losses, Unfunded Loan Commitments Expected increase to the allowance for losses related to unfunded loan commitments Allowance for loan losses forecast period in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Allowance for Loan Losses Forecast Period Allowance for loan losses forecast period New Accounting Standards and Pronouncements [Abstract] New Accounting Standards [Abstract] Carrying amount of other real estate assets taken in settlement of troubled loans through surrender or foreclosure. Other Real Estate, Acquired Balance at end of year, net of valuation allowance Balance at beginning of year, net of valuation allowance Disposals of real estate assets taken in settlement of troubled loans through surrender or foreclosure. Other Real Estate, Acquired Disposals Sales of other real estate Valuation adjustments made to real estate assets taken in settlement of troubled loans through surrender or foreclosure. Other Real Estate, Acquired Valuation Adjustments Additions to valuation allowance charged to expense Carrying amount of other assets taken in settlement of troubled loans. Other Repossessed Assets Other repossessed assets Amount of residential real estate included in foreclosed assets. Foreclosed Residential Real Estate Foreclosed residential real estate Additions of real estate assets taken in settlement of troubled loans through surrender or foreclosure. Other Real Estate, Acquired Additions Loans transferred to other real estate This item represents reductions in the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security because of the write-down/payoff of impaired securities during the period. Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Written Down/Paid Off Reduction The number of private label mortgage backed securities settled which were previously recorded under OTTI. Number of Securities Settled which Were Recorded under OTTI Number of securities settled which were recorded under OTTI Amount of available-for-sale debt securities at cost, net of adjustments, that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the cost over several maturity groupings. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. Other Asset Backed Without Single Maturity Date Amortized Cost Basis Other asset backed Private Label Mortgage Backed Securities Below Investment Grade [Abstract] Private Label Mortgage Backed Securities Below Investment Grade [Abstract] The amount of credit related other than temporary impairments recognized in earnings. Credit Related OTTI Recognized in Earnings Credit related OTTI charges recognized in earnings The fair value of non-rated trust preferred securities at the end of the period. Non Rated Trust Preferred Securities Fair Value Fair value of non-rated trust preferred securities Fair value of private label mortgage backed securities currently below investment grade with credit related OTTI. Fair Value Private Label Mortgage Backed Securities Currently Below Investment Grade With Credit Related O T T I Fair value The number of securities at period end that are not rated for investment quality by an external rating agency. Number Of Securities Not Externally Rated Number of securities not rated The amortized cost of non-rated trust preferred securities at the end of the period. Non Rated Trust Preferred Securities Amortized Cost Non-rated securities, amortized cost The number of securities reviewed for other-than-temporary impairment. Number of Securities Reviewed for Other than Temporary Impairment Number of securities reviewed for OTTI Amortized cost of private label mortgage backed securities currently below investment grade with credit related OTTI. Private Label Mortgage Backed Securities Currently Below Investment Grade With Credit Related O T T I Amortized Cost Amortized cost Non-credit unrealized losses on private label mortgage backed securities currently below investment grade with credit related OTTI. Private Label Mortgage Backed Securities Currently Below Investment Grade With Credit Related O T T I Non Credit Unrealized Losses Non-credit unrealized loss Unrealized gain on private label mortgage backed securities currently below investment grade with credit related OTTI. Private Label Mortgage Backed Securities Currently Below Investment Grade With Credit Related O T T I Unrealized Gains Unrealized gain The number of securities rated as investment grade by rating agency. Number Of Securities Rated As Investment Grade Number of issues rated as investment grade The amount of calculated credit related OTTI on private label mortgage backed securities. Private Label Mortgage Backed Securities Currently Below Investment Grade Cumulative Credit Related O T T I Cumulative credit related OTTI Amount of available-for-sale debt securities at cost, net of adjustments, that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the cost over several maturity groupings. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. Government Agency, Commercial mortgage backed, without Single Maturity Date, Amortized Cost Basis U.S. agency commercial mortgage-backed Amount of available-for-sale debt securities at fair value that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the fair value over several maturity groupings. Government Agency Commercial mortgage backed, Debt Maturities, without Single Maturity Date, Fair Value U.S. agency commercial mortgage-backed Amount of available-for-sale debt securities at fair value that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the fair value over several maturity groupings. Other Asset Backed Debt Maturities Without Single Maturity Date Fair Value Other asset backed Amount of available-for-sale debt securities at fair value that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the fair value over several maturity groupings. Private label mortgage backed, Debt Maturities, without Single Maturity Date, Fair Value Private label mortgage-backed Amount of available-for-sale debt securities at cost, net of adjustments, that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the cost over several maturity groupings. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. Private label mortgage backed, without Single Maturity Date, Amortized Cost Basis Private label mortgage-backed Private label residential mortgage-backed securities that are senior securities. Senior Security [Member] Senior Security [Member] Private label residential mortgage-backed securities that are super senior securities. Super Senior Security [Member] Super Senior Security [Member] Trust preferred securities that are rated. Rated Issues [Member] Rated Issues [Member] Trust preferred securities that are not rated. Unrated Issues No OTTI [Member] Unrated Issues [Member] The pre-adjusted total of all stockholders' equity (deficit) items prior to a change in accounting principle. Stockholders Equity Attributable to Parent, Prior to Cumulative Effect of Change in Accounting Principle Balance at beginning of period, before adjustment Amount of disproportionate tax effects from cash flow hedges. Accumulated Other Comprehensive Income Loss Disproportionate Tax Effects From Cash Flow Hedges [Member] Disproportionate Tax Effects from Cash Flow Hedges [Member] Amount of disproportionate tax effects from securities available for sale. Accumulated Other Comprehensive Income Loss Disproportionate Tax Effects From Securities Available For Sale [Member] Disproportionate Tax Effects from Securities Available for Sale [Member] Refers to the amount of reclassification of certain tax effects from accumulated other comprehensive income. Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income Reclassification of certain deferred tax effects Refers to the amount of disproportionate tax effects due to change in tax rate from accumulated other comprehensive income. Disproportionate Tax Effects Due to Change in Tax Rate Disproportionate tax effects due to change in tax rate Amount of financing receivables guaranteed by US Government Authorities. Financing Receivable, Government Guaranteed Loans Government guaranteed loans excluded from non-performing loans Non performing loans [Abstract] Loans [Abstract] Recorded investment in financing receivables that are past due and are not performing as per the loan agreement at the balance sheet date. Financing Receivable, Recorded Investment, Total Non Performing Loans Total Non-performing Loans Amount of interest that would have been accrued if non-performing loans continued to accrue interest according to their original terms. Non Performing Loan Interest Income Accrued Interest Amount of interest that was recorded on non-performing loans. Non Performing Loan Interest Income Recorded Interest Income Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from vehicle service contract counterparty contingency reserve. Deferred Tax Assets, Vehicle Service Contract Counterparty Contingency Reserve Vehicle service contract counterparty contingency reserve Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from purchase premiums, net. Deferred Tax Assets, Purchase Premiums Net Purchase premiums, net Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from unrealized losses on equity securities. Deferred Tax Assets, Unrealized Losses on Equity Securities Unrealized loss on equity securities Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from non accrual loan interest income. Deferred Tax Assets, Non Accrual Loan Interest Income Non accrual loan interest income Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from loss reimbursement on sold loans reserve. Deferred Tax Assets, Loss reimbursement on sold loans reserve Loss reimbursement on sold loans reserve Amount of deferred tax liability attributable to taxable temporary differences from capitalized mortgage loan servicing rights. Deferred Tax Liabilities Capitalized Mortgage Loan Servicing Rights Capitalized mortgage loan servicing rights Amount of deferred tax liability attributable to taxable temporary differences from deferred loan origination fees and costs. Deferred Tax Liabilities Deferred Expense Deferred Loan Origination Fees Costs Deferred loan fees Amount of deferred tax liability attributable to taxable temporary differences from purchase premiums, net. Deferred Tax Liabilities Purchase Premiums Net Purchase premiums, net Represents the amount of deferred tax liability lease right of use assets. Deferred Tax Liability Lease Right of Use Asset Lease right of use asset Amount of deferred tax liability attributable to taxable temporary differences from unrealized gains on securities available-for-sale. Deferred Tax Liabilities, Unrealized Gains on Securities Available-for-sale Unrealized gain on securities available for sale Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from other than temporary impairment charge on securities available for sale. Deferred Tax Assets, Other than temporary impairment charge on securities available for sale Other than temporary impairment charge on securities available for sale Amount of deferred tax liability attributable to taxable temporary differences from federal home loan bank stock. Deferred Tax Liabilities, Federal Home Loan Bank stock Federal Home Loan Bank stock Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the tax effect of Bank Owned Life Insurance. Effective Income Tax Rate Reconciliation, Bank Owned Life Insurance, Income Tax Effect Amount Bank owned life insurance Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from lease liabilities. Deferred Tax Assets Lease Liabilities Lease liabilities The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in unrecognized tax benefits. Income tax reconciliation unrecognized tax benefits Unrecognized tax benefit Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from reserve for unfunded lending commitments. Deferred Tax Assets, Reserve for Unfunded Lending Commitments Reserve for unfunded lending commitments Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to (deductible) or nondeductible equity-based compensation costs. Effective Income Tax Rate Reconciliation, Share-based Compensation Cost, Excess (Benefit) Deficit Amount Share-based compensation Tabular disclosure of lessee's right of use assets and lease liabilities. Lessee, Operating Lease, Balance Sheet Information [Table Text Block] Supplemental Balance Sheet Information Related to Operating Leases These loans are generally referred to as "substandard accruing" commercial credits. This rating includes loans to borrowers that exhibit a well-defined weakness where payment default is probable and loss is possible if deficiencies are not corrected. Generally, loans with this rating are considered collectible as to both principle and interest primarily due to collateral coverage. Substandard Accrual 9 [Member] Substandard Accrual 9 [Member] These loans are generally referred to as "watch" commercial credits. This rating includes loans to borrowers that exhibit potential credit weakness or downward trends. If not checked or cured these trends could weaken our asset or credit position. While potentially weak, no loss of principle or interest is envisioned with these ratings. Watch 7-8 [Member] Watch 7-8 [Member] These loans are generally referred to as "substandard - non-accrual" and "doubtful" commercial credits. This rating includes loans to borrowers with weaknesses that make collection of debt in full, on the basis of current facts, conditions and values at best questionable and at worst improbable. All of these loans are placed in non-accrual. Non Accrual 10-11 [Member] Non Accrual 10-11 [Member] These loans are generally referred to as "non-watch" commercial credits that include very high or exceptional credit fundamentals through acceptable credit fundamentals. Non-Watch 1-6 [Member] Non-Watch 1-6 [Member] Financing receivables that are equal to or greater than 30 days past due. Financing Receivables, Equal to Greater than 30 Days Past Due [Member] Loans Past Due Total [Member]