Amendment Flag Current Fiscal Year End Date Document Period End Date Entity [Domain] Entity [Domain] Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Registrant Name Entity Central Index Key Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Legal Entity [Axis] Document Type Award Type [Axis] Number of securities with market fair value less than amortized cost Unrealized Gains (Losses) on Securities Available For Sale [Member] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Loss ("AOCL") [Abstract] Accumulated Other Comprehensive Loss [Member] AOCI Attributable to Parent [Member] Accumulated other comprehensive loss for regulatory purposes Accumulated other comprehensive loss Accumulated other comprehensive loss Share based compensation withholding obligation Adjustments Related to Tax Withholding for Share-based Compensation Adjustments to Reconcile Net Income to Net Cash From Operating Activities Adjustments for Change in Accounting Principle [Axis] Adjustments for New Accounting Pronouncements [Axis] Total Adjustments Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities Advertising Total compensation expense recognized Increase (decrease) in allowance for loan losses Allowance for Loan and Lease Losses, Period Increase (Decrease) Allowance for loan losses and recorded investment in loans by portfolio segment Antidilutive Securities [Axis] Antidilutive shares excluded from computation of diluted loss per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities, Name [Domain] Other real estate, additional charge Asset Impairment Charges Impairment charges recognized [Abstract] Other Asset Backed [Member] Asset-backed Securities [Member] Assets [Abstract] Assets, Fair Value Disclosure [Abstract] Total Assets Total assets Assets Assets [Abstract] Assets [Abstract] Maturing after five years but within ten years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis Total, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Securities available for sale Securities available for sale Fair Value Less Than Twelve Months, Fair Value Maturing after one year but within five years Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] Unrealized Gains Twelve Months or More, Unrealized Losses Maturing after ten years Twelve Months or More, Fair Value Available-for-sale Securities, Amortized Cost Basis [Abstract] Maturing after one year but within five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis Total, Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Unrealized Losses Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] Maturing after ten years Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis Amortized Cost Available-for-sale Securities, Amortized Cost Basis Maturing after five years but within ten years Less Than Twelve Months, Unrealized Losses Available-for-sale securities, debt maturities, amortized cost basis Available-for-sale Debt Securities, Amortized Cost Basis Total available-for-sale securities fair value Available-for-sale Securities, Debt Maturities, Single Maturity Date Gain and losses realized on sale of securities available for sale [Abstract] Realized losses Maturing within one year U.S. agency residential mortgage-backed Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] U.S. agency residential mortgage-backed Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value Maturing within one year Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis Proceeds Realized gains Balance Sheet Location [Axis] Balance Sheet Location [Domain] Bank-owned life insurance Regulatory Matters [Abstract] Total risk-based capital Capital Total capital to risk-weighted assets [Abstract] Minimum for Adequately Capitalized Institutions, Ratio Capital Required for Capital Adequacy to Risk Weighted Assets Actual, Ratio Capital to Risk Weighted Assets Minimum for Adequately Capitalized Institutions, Amount Minimum for Well Capitalized Institutions, Amount Minimum for Well-Capitalized Institutions, Ratio Capital Required to be Well Capitalized to Risk Weighted Assets Recorded Book Balance [Member] Reported Value Measurement [Member] Cash and Cash Equivalents at Beginning of Period Cash and Cash Equivalents at End of Period Cash and Cash Equivalents Cash and Cash Equivalents, at Carrying Value Cash and due from banks Net Increase (Decrease) in Cash and Cash Equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and due from banks Cash and Cash Equivalents, Fair Value Disclosure Adjustments for Change in Accounting Principle [Domain] Change in Accounting Method [Member] Change in Accounting Method Accounted for as Change in Estimate [Member] Change in Accounting Estimate, Type [Domain] Change in Accounting Estimate by Type [Axis] Class of Stock [Line Items] Class of Stock [Domain] Accounts Receivables Due to Mepco [Member] Commercial [Member] Commercial [Member] U.S. Agency Commercial Mortgage-Backed [Member] Commercial and Industrial [Member] Commercial and Industrial [Member] Contingent Liabilities Commitments and Contingencies Disclosure [Text Block] Contingent Liabilities [Abstract] Declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Common Stock [Member] Paid (in dollars per share) Common stock, shares issued (in shares) Common stock, par value (in dollars per share) Common stock, shares authorized (in shares) Common stock, no par value, 500,000,000 shares authorized; issued and outstanding: 21,327,796 shares at March 31, 2017 and 21,258,092 shares at December 31, 2016 Common Stock, Value, Issued Common stock, shares outstanding (in shares) Communications Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Accumulated Other Comprehensive Loss ("AOCL") Comprehensive Income (Loss) Note [Text Block] Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Consolidated [Member] Consolidated Entities [Member] Retail [Member] Corporate [Member] Cumulative effect of change in accounting Cumulative effect of change in accounting Term of note Deferred tax assets, net Deferred tax assets, net Valuation allowance against deferred tax assets Deferred Tax Assets, Valuation Allowance Deposits Deposits [Abstract] Total Deposits Deposits Savings and interest-bearing checking 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 Derivative Instrument [Axis] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Average Maturity Derivative financial instrument according to type of hedge[ Abstract] Derivative financial instruments Derivatives Derivative Financial Instruments [Abstract] Notional Amount Derivative financial instruments Derivatives Derivative Liability Gain (Loss) Recognized in Income Fair Value Derivative, Fair Value, Net Asset Derivatives Derivative Asset, Fair Value, Gross Asset Liability Derivatives Fair value of derivative instruments, balance sheet location [Abstract] Derivative Instruments, Gain (Loss) [Line Items] Derivative Contract [Domain] Derivative Instruments, Gain (Loss) [Table] Derivatives, Fair Value [Line Items] Directors [Member] Share Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Share Based Compensation [Abstract] Cash dividends declared Dividends, Common Stock, Cash Basic (in dollars per share) Basic (in dollars per share) Diluted (in dollars per share) Earnings Per Share, Diluted Earnings Per Share Reconciliation [Abstract] Net Income Per Common Share Earnings Per Share [Abstract] Tax benefit realized Total compensation cost not yet recognized, period for recognition Stock Options [Member] Tax benefit relating to compensation expense recognized Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Cash proceeds received Total compensation cost not yet recognized Furniture, fixtures and equipment Equipment Expense Equity Component [Domain] Fair Value [Member] Estimate of Fair Value Measurement [Member] Asset (Liability) Fair Value [Abstract] Fair Value, Net Asset (Liability) [Abstract] Included in results of operations Asset Class [Axis] Included in other comprehensive income Liability Class [Axis] Fair Value, Hierarchy [Axis] Discount rate Measurement Frequency [Axis] Fair Value Disclosures [Abstract] Total Change in Fair Values Included in Current Period Earnings Amount of total gains losses for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities still held at March 31 Measurement Basis [Axis] Asset Class [Domain] Asset Class [Domain] Assets and liabilities measured at fair value Fair Value, Measurements, Nonrecurring [Member] Assets and liabilities measured at fair value [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value Hierarchy [Domain] Changes in fair value for financial assets [Abstract] Fair Value Disclosures Fair Value Disclosures [Text Block] Fair Value by Liability Class [Domain] Quantitative information about Level 3 fair value measurements measured on a non-recurring basis Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Estimated recorded book balances and fair values Fair Value, by Balance Sheet Grouping [Table Text Block] Fair Value Measurement [Domain] Reconciliation for all assets and (liabilities) 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] Significant Unobservable Inputs (Level 3) [Member] Significant Unobservable Inputs (Level 3) [Member] Fair Value, Inputs, Level 3 [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Significant Other Observable Inputs (Level 2) [Member] Significant Other Observable Inputs (Level 2) [Member] Difference Fair Value, Option, Aggregate Differences, Loans and Long-term Receivables Ending balance Beginning balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Transfers in and/or out of Level 3 Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] 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 Changes in fair value for financial assets Fair Value, Option, Quantitative Disclosures [Line Items] Fair Value, Option, Quantitative Disclosures [Line Items] Fair Value, Option, Quantitative Disclosures [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [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 FDIC deposit insurance Title insurance fees Fees and Commissions, Other Service charges on deposit accounts 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] Fair Values of Financial Instruments [Abstract] Financing Receivable, Recorded Investment, Past Due [Line Items] 90+ and Still Accruing Loans not Past Due Financing Receivable, Recorded Investment, Current Total Financing Receivable, Recorded Investment, Past Due Class of Financing Receivable, Type [Axis] Financing Receivable, Modifications [Line Items] Financing Receivables, Period Past Due [Axis] Loans Past Due, 90+ days [Member] Recoveries credited to allowance Loans Past Due, 60-89 days [Member] Individually evaluated for impairment Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Financing Receivable, Allowance for Credit Losses [Line Items] Loans charged against the allowance Financing Receivable, Allowance for Credit Losses, Write-downs Financing Receivable, Recorded Investment [Line Items] Analysis of allowance for loan losses by portfolio segment [Roll Forward] Non-Accrual Recorded balance Financing Receivable, Modifications, Subsequent Default, Recorded Investment Financing Receivable Portfolio Segment [Axis] Number of contracts Financing Receivable, Modifications, Subsequent Default, Number of Contracts Collectively evaluated for impairment Pre-modification recorded balance Financing Receivable, Modifications, Pre-Modification Recorded Investment Summary of loan ratings by loan class Financing Receivable Credit Quality Indicators [Table Text Block] Financing Receivables, Period Past Due [Domain] Allowance for loan losses and recorded investment in loans by portfolio segment [Abstract] Financing Receivable, Impaired [Line Items] Post-modification recorded balance Financing Receivable, Modifications, Post-Modification Recorded Investment Balance at end of period Balance at beginning of period Financing Receivable, Allowance for Credit Losses Number of contracts Financing Receivable, Modifications, Number of Contracts Loans Not Past Due [Member] Class of Financing Receivable, Type [Domain] Collectively evaluated for impairment Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Individually evaluated for impairment Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Loans Past Due, 30-59 days [Member] Charge offs due to troubled debt restructurings Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down 2022 Finite-Lived Intangible Assets, Amortization Expense, after Year Five 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Two Total Finite-Lived Intangible Assets, Net Accumulated Amortization Gross Carrying Amount Nine months ending December 31, 2017 Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Five Summary of estimated intangible amortization [Abstract] Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Three Fixed Income Interest Rate [Member] Other real estate and repossessed assets Foreign Government [Member] Net gains on securities Net gains on assets Intangible Assets [Abstract] Hedging Designation [Axis] Hedging Designation [Domain] Impaired loans Unpaid Principal Balance, with an allowance recorded Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance Recorded Investment, with an allowance recorded Impaired Financing Receivable, with Related Allowance, Recorded Investment Recorded Investment, with no related allowance Impaired Financing Receivable, with No Related Allowance, Recorded Investment Interest Income Recognized Impaired Financing Receivable, Interest Income, Accrual Method Unpaid Principal Balance Average Recorded Investment Average Recorded Investment, with No Related Allowance Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment Average Recorded Investment, with Related Allowance Impaired Financing Receivable, with Related Allowance, Average Recorded Investment Impaired Loans by class [Abstract] Impaired Financing Receivable, Recorded Investment [Abstract] Related Allowance Impaired Financing Receivable, Related Allowance Interest Income Recognized, with No Related Allowance Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method Recorded Investment Unpaid Principal Balance, with no related allowance Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance Interest Income Recognized, with Related Allowance Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method Income Tax [Abstract] Income Statement Location [Axis] Total reclassifications before tax Income Before Income Tax Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income Statement Location [Domain] Income Approach [Member] Income Tax Income Tax Disclosure [Text Block] Income tax expense Income tax expense Condensed Consolidated Statements of Operations (unaudited) [Abstract] Income taxes Deferred income tax expense Increase (Decrease) in Deferred Income Taxes Decrease in accrued expenses and other liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Net increase in total deposits Loans held for sale [Abstract] Increase (Decrease) in Loans Held-for-sale [Abstract] Deferred loan fees Increase (Decrease) in Loans, Deferred Income Increase in accrued income and other assets Increase (Decrease) in Other Operating Assets Increase (Decrease) in Stockholders' Equity [Roll Forward] Effect of stock options (in shares) Intangible Assets Intangible Assets Disclosure [Text Block] Amortized intangible assets - core deposits [Abstract] Other intangibles Intangible assets Interest Expense Interest Expense [Abstract] Interest and fees on loans Interest Income Total Interest Income Interest and Dividend Income, Operating Total Interest Expense Interest Expense Interest on securities Accrued interest payable Other borrowings and subordinated debentures Interest Expense, Borrowings Deposits Interest Expense, Deposits Net Interest Income Interest Income (Expense), Net Interest Income [Member] Net Interest Income After Provision for Loan Losses Interest Income (Expense), after Provision for Loan Loss Taxable Interest Tax-exempt Accrued interest receivable Time Interest Expense [Member] Interest Rate Swap [Member] Interest Rate Swap [Member] Interest bearing deposits Interest-bearing Deposits in Banks and Other Financial Institutions Rate-Lock Mortgage Loan Commitments [Member] Internal Credit Assessment [Domain] Internal Credit Assessment [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 Subordinated debentures Subordinated debentures Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Compensation and employee benefits Total Liabilities Liabilities Total Liabilities and Shareholders' Equity Total Liabilities and Shareholders' Equity Liabilities and Shareholders' Equity Liabilities [Abstract] Liabilities, Fair Value Disclosure [Abstract] Allowance for loan losses Total ending allowance balance Loans and Leases Receivable, Allowance Installment Loans [Abstract] Loans and Leases Receivable, Other Information [Abstract] Loans Net Loans Loans and Leases Receivable, Net Amount Total Loans Total loans Loans held for sale, carried at fair value Loans held for sale Aggregate Fair Value Loans Held-for-sale, Fair Value Disclosure Loans Held For Sale [Member] Loans Receivable [Member] Contractual Principal Loans Receivable Held-for-sale, Amount Loans Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Commercial Commercial loans Loans Receivable, Gross, Commercial, Financial and Agricultural Commercial and industrial Loss Contingencies [Table] Loss Contingencies [Line Items] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Trust preferred securities Net gains on securities Securities Marketable Securities, Gain (Loss), Excluding Other than Temporary Impairments Maximum [Member] Minimum [Member] Retail mortgage loans in process of foreclosure Mortgage Loans on Real Estate, Loan Type [Domain] Mortgage Loans on Real Estate, Loan Type [Axis] Private Label Mortgage-Backed [Member] Private Label Mortgage-Backed [Member] U.S. Agency Residential Mortgage-Backed [Member] Non-performing TDRs [Member] Cash Flow From Financing Activities Net Cash From (Used in) Investing Activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net Cash From Financing Activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net Cash From Operating Activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Cash Flow From (Used in) Investing Activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Reclassifications, net of tax Net income Net Income Net income per common share [Abstract] Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] New Accounting Standards New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Cumulative effect of adjustments New Accounting Pronouncement, Effect of Early Adoption [Member] New Accounting Pronouncement, Early Adoption, Effect [Member] New Accounting Standards [Abstract] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Non-interest bearing Non-interest Income Noninterest Income [Abstract] Non-interest Expense Total Non-Interest Expense Noninterest Expense Total Non-Interest Income Noninterest Income Other Noninterest Income, Other Operating Income Promissory Note [Member] No Hedge Designation [Member] Other comprehensive income before reclassifications OCI, before Reclassifications, Net of Tax, Attributable to Parent Occupancy, net Officers [Member] Officer [Member] Preparation of Financial Statements [Abstract] Preparation of Financial Statements Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Income tax expense Other Comprehensive Income (Loss), Available-for-sale Securities, Tax Other real estate [Abstract] Other Real Estate [Abstract] Reclassification adjustments for gains included in earnings Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Unrealized gains recognized in other comprehensive income on available for sale securities, net of tax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Increases to credit losses on securities for which OTTI was previously recognized Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] OTTI changes recorded in earnings Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities Net impairment loss recognized in earnings Other than Temporary Impairment Losses, Investments, Available-for-sale Securities 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 Additions to credit losses on securities for which no previous OTTI was recognized Unrealized gains recognized in other comprehensive income on securities available for sale Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax Securities available for sale Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, [Abstract] Other borrowings Other borrowings Other Borrowings Accrued income and other assets Unrealized gains arising during period Other investments Other Interest and Dividend Income Accrued expenses and other liabilities Other Other Real Estate and Foreclosed Assets [Abstract] Other Assets [Member] Other comprehensive income, before tax Other Liabilities [Member] Other comprehensive income Net current period other comprehensive income Net change in accumulated other comprehensive loss, net of related tax effect Performing TDRs [Member] Performing Financial Instruments [Member] Aging analysis of loans by class Past Due Financing Receivables [Table Text Block] Disbursements for loans held for sale Payments for Origination of Mortgage Loans Held-for-sale Share based compensation withholding obligation Payments Related to Tax Withholding for Share-based Compensation Net increase in portfolio loans (loans originated, net of principal payments) Payments for (Proceeds from) Loans and Leases Purchases of securities available for sale Payments to Acquire Available-for-sale Securities Dividends paid Payments of Dividends Repurchase of common stock Payments for Repurchase of Common Stock Purchase of Federal Reserve Bank stock Payments to Acquire Federal Reserve Bank Stock Capital expenditures Payments to Acquire Property, Plant, and Equipment Performance Stock Units [Member] Plan Name [Domain] Plan Name [Axis] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Preferred stock, shares issued (in shares) Preferred stock, par value (in dollars per share) Preferred Stock, No Par Value Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Preferred stock, no par value, 200,000 shares authorized; none issued or outstanding Preferred Stock, Value, Issued Net decrease in other borrowings Cash payment for litigation settlement relating to collection of vehicle service contracts counterparty receivables Proceeds from issuance of common stock Proceeds from bank-owned life insurance Proceeds from sales of loans held for sale Proceeds from Sale of Loans Held-for-sale Proceeds from the sale of securities available for sale Proceeds from the sale of other real estate and repossessed assets Legal and professional Property and equipment, net Provision for loan losses Provision for loan losses Additional provision for loan losses on impaired loans Range [Axis] Range [Domain] Foreclosed residential real estate properties Other real estate, valuation allowance Real Estate Owned, Valuation Allowance Credit losses recognized in earnings on securities available for sale Loans [Abstract] Amounts reclassified from AOCL Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Member] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Axis] Summary of reclassifications out of each component of AOCL Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Regulatory Matters Regulatory Capital Requirements under Banking Regulations [Text Block] Mortgage [Member] Residential Portfolio Segment [Member] Cumulative Retrospective Adjustments [Member] Restatement Adjustment [Member] Restricted Stock [Member] Accumulated deficit Exercisable, Aggregate Intrinsic Value Vested and Expected to Vest, Weighted-Average Remaining Contractual Term Outstanding, Weighted Average Remaining Contractual Term Exercisable, Weighted Average Remaining Contractual Term Estimated amortization of other intangible assets Scenario, Unspecified [Domain] Originally Presented [Member] Scenario, Previously Reported [Member] As Adjusted [Member] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of accumulated other comprehensive loss (AOCL), net of tax Summary of non-vested restricted stock, restricted stock units and PSU's Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Summary of outstanding stock option grants and transactions Information regarding options exercised Loans on non-accrual status and past due more than 90 days Other intangible assets, net of amortization Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Schedule of Financing Receivables Past Due [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Reconciliation of basic and diluted net income per share Analysis of allowance for loan losses by portfolio segment Securities available for sale Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Schedule of Impaired Financing Receivable [Table] Gains and losses realized on sale of securities available for sale Schedule of Realized Gain (Loss) [Table Text Block] Investments in a continuous unrealized loss position Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Line Items] Actual capital amounts and ratios Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Condensed consolidated statement of financial position to reflect cumulative effect of adjustments Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Fair value of derivative instruments Schedule of Stock by Class [Table] Effect of derivative financial instruments on condensed consolidated statement of operation Capitalized mortgage loan servicing rights Servicing Asset at Amortized Cost Capitalized mortgage loan servicing rights, carrying amount Servicing Asset at Amortized Cost, Fair Value Capitalized mortgage loan servicing rights Capitalized mortgage loan servicing rights Change in accounting Mortgage loan servicing, net Information regarding options exercised [Abstract] Share based compensation Share-based Compensation Forfeited (in dollars per share) Vesting period Weighted Average Grant Date Fair Value [Roll Forward] Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 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] Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 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 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) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Average Exercise Price [Roll Forward] Granted (in shares) Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Outstanding, ending balance (in dollars per share) Outstanding, beginning 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 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 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) Weighted-Average Remaining Contractual Term (Years) [Abstract] Intrinsic value Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Outstanding, ending balance (in dollars per share) Outstanding, beginning balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Outstanding, ending balance (in shares) Outstanding, beginning balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 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 Equity Award [Domain] Outstanding, Aggregate Intrinsic Value Number of Shares [Roll Forward] Class of Stock [Axis] Equity Components [Axis] Condensed Consolidated Statements of Shareholders' Equity (unaudited) [Abstract] Condensed Consolidated Statements of Cash Flows (unaudited) [Abstract] Condensed Consolidated Statements of Comprehensive Income (unaudited) [Abstract] Condensed Consolidated Statements of Financial Condition (unaudited) [Abstract] Scenario [Axis] Issuance of common stock Stock Issued During Period, Value, New Issues Repurchase of common stock Stock Repurchased During Period, Value Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Share based compensation Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Shareholders' Equity Shareholders' Equity and Earnings Per Common Share Stockholders' Equity Note Disclosure [Text Block] Shareholders' Equity and Earnings Per Common Share [Abstract] Balance at beginning of period Balance at end of period Total Shareholders' Equity Total shareholders' equity Total Shareholders' Equity Mepco [Member] Subsidiaries [Member] Actual, Ratio Minimum for Adequately Capitalized Institutions, Amount Tier One Leverage Capital Required for Capital Adequacy Minimum for Adequately Capitalized Institutions, Ratio Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets Minimum for Well-Capitalized Institutions, Amount Tier One Risk Based Capital Required to be Well Capitalized Tier 1 capital to average assets [Abstract] Minimum for Well-Capitalized Institutions, Ratio Tier One Leverage Capital Required to be Well Capitalized to Average Assets Actual, Ratio Tier One Leverage Capital to Average Assets Minimum for Adequately Capitalized Institutions, Amount Tier One Risk Based Capital Required for Capital Adequacy Minimum for Well Capitalized Institutions, Ratio Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets Tier 1 capital Tier One Leverage Capital Minimum for Adequately Capitalized Institutions, Ratio Tier One Leverage Capital Required for Capital Adequacy to Average Assets Minimum for Well-Capitalized Institutions, Amount Actual, Amount Tier One Risk Based Capital Tier 1 capital to risk-weighted assets [Abstract] Tier One Risk Based Capital [Abstract] Deposits with stated maturity Relationship to Entity [Domain] Title of Individual [Axis] Trading Activity [Axis] Trading securities Trading securities Trading Securities [Member] Trading Activity, by Type [Domain] Trading securities, realized losses Trading Securities, Realized Gain (Loss) Transfers to other real estate and repossessed assets Troubled debt restructurings Trust Preferred [Member] Type of Adoption [Domain] Subjective Allocation [Member] Unallocated Financing Receivables [Member] Gross unrecognized tax benefits U.S. Agency [Member] Obligations of States and Political Subdivisions [Member] Valuation Allowance [Table] Valuation Allowance [Line Items] Capitalized mortgage loan servicing rights, valuation allowance Valuation Technique [Axis] Valuation Technique [Domain] Variable Income Interest Rate [Member] Weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Restricted stock units (in shares) Weighted average shares outstanding for calculation of diluted earnings per share (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Aggregate intrinsic value [Abstract] Aggregate Intrinsic Value [Abstract] 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) Number of new stock units or restricted shares issued during the period. Stock Units Or Restricted Shares Issued During Period Number of stock units or restricted shares issued in period (in shares) Executive of the entity that is appointed to the position by the board of directors and certain officers and employees during the period. Officers and Employees [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] Name of the equity-based compensation arrangement plan, in Q2 changed name from Performance based compensation plan to Long-term incentive plan. Performance Based Compensation Plan [Member] Long-term Incentive Plan [Member] 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] 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. Mepco [Member] Mepco [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 for which a portion of other than temporary impairment has been recognized in earnings Refers to the increase (decrease) in the carrying value of payment plan receivables and other assets held for sale. Net Increase (Decrease) in Payment Plan Receivables and Other Assets Held for Sale Net increase in payment plan receivables and other assets held for sale The increase (decrease) during the period in the carrying value of other liabilities held for sale. Increase (Decrease) in Other Liabilities Held for Sale Net increase in other liabilities held for sale Cash Paid During the Period For [Abstract] Cash paid during the period for The value of payment plan receivables transferred to vehicle service contract counterparty receivables in the period. Transfer of payment plan receivables to vehicle service contract counterparty receivables 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 The cash inflow associated with maturities (principal being due) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. Proceeds From Maturity Of Available For Sale Securities Proceeds from the maturity of securities available for sale The cash inflow associated with principal payments, prepayments and call (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. Principal Payments Received On Available For Sale Securities Principal payments received on securities available for sale The gain (loss) in earnings that represent the difference between sale price and carrying value of loans and Leases that were sold during the reporting period, the difference between fair value and carrying value of loans held for sale still held at period end and fair value of mortgage banking derivatives still held at period end. This does not include the cash proceeds of the sales. This is a noncash adjustment when calculating net cash generated by operating activities using the indirect method. Gain Loss On Sale Of And Fair Value Adjustments On Loans And Leases Net gains on mortgage loans Mortgage loans Purchase of securities available for sale not yet settled. Purchase of securities available for sale not yet settled Purchase of securities available for sale not yet settled The net cash inflow for the maturity of Interest-bearing Deposits-Time by banks in other financial institutions with maturities greater than three months including, for example, certificates of deposits. Proceeds From Interest Bearing Deposits In Banks Time Proceeds from the maturity of interest bearing deposits - time 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 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] Accumulated net gain or loss from settled derivatives. Accumulated Net Gain Loss From Settled Derivatives [Member] Unrealized Gains (Losses) on Settled Derivatives [Member] 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] The adjusted total of all stockholders' equity (deficit) items. Stockholders Equity Attributable to Parent As Adjusted Balance at beginning of period, as adjusted The cumulative amount of the subsidiary reporting entity's undistributed earnings or deficit. Retained Earnings Accumulated Deficit Subsidiary Undivided profits 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] Refers to request for approval to transfer of capital from bank to parent entity. Transfer Of Capital From Bank To Parent Entity Request Request for approval to transfer capital from bank to parent entity Components of regulatory capital [Abstract] Components of regulatory capital [Abstract] Add (deduct) [Abstract] Add (deduct) [Abstract] 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 Common Equity Tier 1 Capital as defined in the regulations. Common Equity Tier One Capital Common equity tier 1 capital Actual, Amount Common Equity Tier One Capital [Abstract] Common equity tier 1 capital to risk-weighted assets [Abstract] 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 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 minimum amount of Common Equity Tier 1 Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. Common Equity Tier One Capital Required For Capital Adequacy Minimum for Adequately Capitalized Institutions, Amount 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 The amount of Common Equity Tier 1 Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. Common Equity Tier One Capital Required To Be Well Capitalized Minimum for Well-Capitalized Institutions, Amount Deferred tax assets not qualifying as common equity Tier 1 capital. Disallowed Deferred Tax Assets Disallowed deferred tax assets 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 Tabular disclosure of components of regulatory capital. Components of regulatory capital [Text Block] Components of regulatory capital 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 resort lending financing receivables. Resort Lending [Member] Resort Lending [Member] Financing arrangement that represents a contractual right to receive money either on demand or on fixed or determinable dates related to commercial land, land development and real estate construction. Commercial Land Land Development Real Estate Construction Financing Receivable [Member] Land, Land Development and Construction - Real Estate [Member] Class of financing receivables related to home equity - 2nd lien financing receivables. Home Equity, Second Lien [Member] Home Equity - 2nd Lien [Member] Class of financing receivables related to boat lending financing receivables. Boat Lending [Member] Boat Lending [Member] Class of financing receivables related to income producing real estate financing receivables. Commercial Income Producing Real Estate Receivable [Member] Income Producing - Real Estate [Member] Amount of allowance for loan losses allocated [Abstract] Amount of allowance for loan losses allocated [Abstract] Non-troubled debt restructured allowance based on collateral. Non Troubled Debt Restructuring Allowances Based On Collateral Non - TDR - allowance based on collateral Accrued total interest included in recorded investment in impaired loans at period end. Accrued Interest, Impaired Loans Accrued interest included in recorded investment 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 [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] Class of financing receivables related to 1-4 family financing receivables. Family 1 4 [Member] 1-4 Family [Member] Amount of troubled debt restructurings. Troubled Debt Restructuring, Amount TDR Impaired Loan With An Allocated Allowance [Abstract] Impaired loans with an allocated allowance [Abstract] Troubled debt restructured, allowance based on present value cash flow. Troubled Debt Restructuring Allowances Based on Present Value Cash Flow TDR - allowances based on present value cash flow 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 with allowance based on the collateral Troubled Debt Restructuring Allowances Based on Collateral TDR allowances based on collateral Total amount of allowance for loan losses allocated Allowance For Loan Losses Allocated Allowance for loan losses allocated Portfolio segment of the company's total financing receivables related to installment financing receivables. Installment Portfolio Segment [Member] Installment [Member] Class of financing receivables related to installment financing receivables. Installment Other [Member] Other [Member] 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 No Related Allowance 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 Class of financing receivables related to home equity - 1st lien financing receivables. Home Equity, First Lien [Member] Home Equity - 1st Lien [Member] 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 Non-troubled debt restructured, allowance based on collateral. Non Troubled Debt Restructuring Allowance Based on Collateral Non - TDR - allowance based on collateral 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) Refers to number of weighted average performance stock units. Weighted Average Number Of Performance Shares Stock Performance share units (in shares) The percentage share authorized to be repurchased under a stock repurchase plan. Stock Repurchase Program Percentage Of Shares Authorized To Be Repurchased Stock repurchase program percentage of shares authorized to be repurchased Refers to purchased options relating to Altitude CD product. Purchased Options [Member] Refers to written options relating to Altitude CD product. 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] 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 The period when loan payment is considered to be in default. Past due period for modified loans Past due period for modified loans 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. Financing Receivable Modifications Of Stated Interest Rate Period Modification of stated interest rate of loans, range of period 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 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 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 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 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 TDR that subsequently defaulted [Abstract] TDR that subsequently defaulted [Abstract] 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 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 Refers to payment plan receivables and other assets held-for-sale relating to the sale of Mepco. Payment Plan Receivables And Other Assets Held For Sale Payment plan receivables and other assets held for sale Amount classified as liabilities attributable to the sale of Mepco. Liabilities Held for Sale Other liabilities held for sale Total amount of reciprocal deposits . Reciprocal deposits Reciprocal 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 Amount before allowance of consumer mortgage. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. Loans and Leases Receivable, Mortgage Mortgage Represents the aggregate amount of funds due from counterparties for cancelled service contracts, net of any reserves. Vehicle Service Contract Counterparty Receivables Net Vehicle service contract counterparty receivables, net Aggregate amount of counterparty obligations Dividends Per Common Share [Abstract] Dividends Per Common Share Represents interchange fees earned on debit card transactions. Interchange Income Interchange income The amount of expenses incurred in the period for data processing services and related costs. Data Processing Data processing Amount of expense related to debit card transactions. Interchange Expense Interchange expense Charges in the period for credit card and bank service fees. Credit Card and Bank Service Fees Credit card and bank service fees 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 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] Aging analysis of loans by class [Abstract] Aging analysis of loans by class [Abstract] 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 but unpaid interest. Excludes loans and leases covered under loss sharing agreements. Loans And Leases Receivable Recorded Investment Total loans recorded investment Accrued total interest included in recorded investment in loans at period end. Accrued interest included in recorded in investment in loans Accrued interest included in recorded investment Accrued interest included in total Non performing loans [Abstract] Amount of interest that would have been accrued if non-performing loans continued to accrue interest according to their original terms. Accrued Interest, Non-Performing Loan Accrued interest included in recorded investment 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 Class of financing receivables related to purchased loans financing receivables. Purchased Loans [Member] Portfolio segment of the company's total financing receivables related to payment plan receivables. Payment Plan Receivables Portfolio Segment [Member] Payment Plan Receivables [Member] Allowance for loan losses [Abstract] Additions (deductions) [Abstract] 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 "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 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] Loan ratings/credit scores by loan class [Abstract] Loan ratings/credit scores by loan class [Abstract] Represents the FICO score of loans by category. Credit score 550 to 599 550-599 Represents the FICO score of loans categorized as unknown. Unknown Unknown 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 650 to 699 650-699 Represents the FICO score of loans by category. Credit score 500 to 549 500-549 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 Under 500 Under 500 Total recorded investments by credit score. Credit score by investment Total 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] 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 750 to 799 750-799 Refers to the other real estate of loan portfolios. Other Real Estate [Member] Class of assets, impaired loans. Impaired Loans [Member] The maximum dollar level at which collateral dependent commercial impaired loans will have their appraisal reports reviewed by the special assets group. Value of collateral dependent impaired loans that will be reviewed by special assets group, maximum Value of collateral-dependent impaired loans that will be reviewed by special assets group, maximum The minimum dollar level at which collateral dependent commercial impaired loans will have their appraisal reports reviewed by an independent third party. Value of collateral dependent impaired loans that will be reviewed by independent third party minimum Value of collateral-dependent impaired loans that will be reviewed by independent third party, minimum Impaired loans [Abstract] Impaired loans [Abstract] Mortgages [Abstract] Mortgage [Abstract] 1-4 family mortgage, fair value disclosure. Family 1 to 4, fair value disclosure 1-4 Family Commercial [Abstract] Commercial [Abstract] Resort lending mortgage, fair value disclosure. Resort Lending, Fair Value Disclosure Resort Lending Income producing real estate stated at fair value. Income producing real estate, Fair Value Disclosure Income producing - real estate Capitalized mortgage loan servicing rights, fair value disclosure. Capitalized Mortgage Loan Servicing Rights Fair Value Disclosure. Capitalized mortgage loan servicing rights Land development and construction real estate, stated at fair value. Land, land development and construction real estate, Fair Value Disclosure Land, land development & construction - real estate The installment payment period for service contract purchased by consumer. Installment payments period for service contract Installment payments period for service contract Amount of interest-bearing promissory note from one of the Company's counterparties. Promissory Note From Counterparty Notes payable amount of settlement to counterparties Non interest provision for loss reimbursement on sold loans. Provision for loss reimbursement on sold loans Provision for loss reimbursement on sold loans Reserve balance as of the reporting date for loss reimbursements on sold mortgage loans. Reserve For Loss Reimbursement On Sold Loans Reserve for loss reimbursement on sold mortgage loans Amount of expense to be paid to settle a class litigation matter. Litigation Settlement, Expenses Litigation settlement expense Represents a reserve on the remaining balance of a promissory note from one of the Company's counterparties. Reserve On Counterparty Promissory Notes Full reserve on the remaining balance The amount refers to class notification costs and certain other estimated expenses. Notification Costs And Other Estimated Expenses Notification costs and other estimated expenses Represents estimated losses incurred during the period relating to vehicle service contract counterparty receivables. Vehicle Service Contract Counterparty Contingencies Vehicle service contract counterparty contingencies Restatement Of Prior Year Financial Position [Abstract] Cumulative Effect Adjustments to Condensed Consolidated Statement of Financial Position [Abstract] The pre-tax effect of early adoption of guidance on financial statement line items. Adjustments for Change in Accounting Principle, Effect, Pre-tax [Member] Additional Premium Amoritization on AFS Securities, Pre-tax [Member] Refers to the amount of increase (decrease) in the amortization premium on available for sale securities. Increase (Decrease) in Premium Amortization on Available for Sale Securities Increase in premium amortization on securities available for sale The effect, net of tax, of early adoption of guidance on financial statement line items. Adjustments for Change in Accounting Principle, Effect, Net of Tax [Member] Additional Premium Amoritization on AFS Securities, Net of Tax [Member] Accounting Standards Update 2017-08 Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities. Accounting Standards Update 2017-08 [Member] ASU 2017-08 [Member] ASU 2017-08 [Member] The effect, after tax, of early adoption of guidance on financial statement line items. Adjustments for Change in Accounting Principle, Effect, After Tax [Member] AOCI Decrease, Unrealized Losses AFS Securites, After Tax [Member] Refers to changes from one acceptable accounting method to another based upon a revision in estimated future benefits or obligations and from an Accounting Standards Update. Change in Accounting Method Accounted for as Change in Estimate and Adjustments for New Accounting Pronouncements [Member] Change in Accounting Method and ASU 2017-08 [Member] Refers to the amount of additional premium amortization on available for sale securities. Adjustment in Amortization on Available for Sale Securities 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 number of private label mortgage backed securities that are forecasted to have complete recovery of cost basis. Private Label Mortgage Backed Securities Complete Recovery of Cost Basis Number of private label mortgage backed securities complete recovery of cost basis 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 Trust preferred securities that are rated. Rated Issues [Member] Rated Issues [Member] 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 Total debt maturities at amortized cost basis. Debt Maturities at Amortized Cost Total 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 Total debt maturities at fair value. Debt Maturities at Fair Value Total 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. Private label residential mortgage backed, Debt Maturities, without Single Maturity Date, Fair Value Private label residential mortgage-backed The number of private label mortgage backed securities with OTTI with unrealized gain. Private Label Mortgage Backed Securities With OTTI Unrealized Gains Number of private label mortgage backed securities currently with OTTI unrealized gains The number of impaired bonds. Number of bonds with impairment in excess of ten percent Number of securities with impairment in excess of ten percent The percentage of excess impairments on rated bonds. Percentage of excess impairment on bonds Percentage of excess impairment on securities Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement that were purchased prior to 2016. Number of securities purchased prior to 2016 Trust preferred securities [Abstract] The fair value of non-rated trust preferred securities at the end of the period. Non Rated Trust Preferred Securities Fair Value Non-rated trust preferred securities, fair value Net unrealized gain/loss on trust preferred securities. Trust Preferred Security Net Unrealized Gain Loss Net Unrealized Loss Fair value of trust preferred securities. Trust Preferred Security Fair Value Fair Value 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 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 non-rated Trust preferred securities that are not rated. Unrated Issues No OTTI [Member] Unrated Issues [Member] Private Label Mortgage Backed Securities Below Investment Grade [Abstract] Private Label Mortgage Backed Securities Below Investment Grade [Abstract] 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 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 bonds with impairment for more than 12 months. Number of Bonds with Impairment For More Than 12 Months Number of securities with impairment for more than 12 months The number of major credit rating agencies rating individual securities during the period with fair value less than amortized cost. Number Of Major Credit Rating Agencies Rating Securities With Fair Value Less Than Amortized Cost Number of major credit rating agencies rating securities with fair value less than amortized cost 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 residential mortgage backed, without Single Maturity Date, Amortized Cost Basis Private label residential mortgage-backed The number of securities rated below investment grade by rating agency. Number of securities rated below investment grade Number of securities rated as below investment grade Private label residential mortgage-backed securities that are senior securities. Senior Security [Member] Private label residential mortgage-backed securities that are senior support securities. Senior Support Security [Member] Private label residential mortgage-backed securities that are super senior securities. Super Senior Security [Member] The amount of credit related other than temporary impairments recognized in earnings. Credit Related OTTI Recognized in Earnings Credit related OTTI recognized in earnings The amortized cost of non-rated trust preferred securities at the end of the period. Non Rated Trust Preferred Securities Amortized Cost Non-rated trust preferred securities, amortized cost 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 For each line item in the statement of financial position, the amounts of gains and losses from fair value changes, for capitalized mortgage loan servicing rights with elected fair value option. Mortgage Loan Servicing Rights Net Fair Value Disclosure Mortgage Loan Servicing, net Refers to the capitalized mortgage loan servicing rights. Capitalized Mortgage Loan Servicing Rights [Member] The additional recovery (charges) of capitalized mortgage loan servicing rights, whose individual strata is measured at fair value. Capitalized Mortgage Loan Servicing Rights Additional Income Charges Capitalized mortgage loan servicing rights The valuation allowance on loans measured for impairment, using the fair value of collaterals. Collateral dependent loans, valuation allowance Loans which are measured for impairment using the fair value of collaterals. Collateral dependent loans, carrying amount Carrying amount of other real estate that are impaired, net reserves. Other Real Estate Impaired, Net Reserves Other real estate, carrying amount For each line item in the statement of financial position, the amounts of gains and losses from fair value changes, for those assets with elected fair value option. Fair Value Option Changes In Fair Value Gain Loss2 Net Gains (Losses) on Assets Estimated recorded book balance and fair value [Abstract] Estimated recorded book balances and fair values [Abstract] Refers to the amount of payment plan receivables and commercial loans held for sale. Payment Plan Receivables And Commercial Loans Held For Sale Payment plan receivables and commercial loans held for sale 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 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 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 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 Amount of all domestic deposit liabilities with no stated maturity. Domestic Deposit Savings No Stated Maturity Deposits with no stated maturity Gain on mortgage loans. Net Mortgage Loan Gains [Member] Net Gains on Mortgage Loans [Member] Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract] Fair Value Assets Measured On Recurring Basis Gain Loss Realized And Unrealized [Abstract] Total losses realized and unrealized [Abstract] Document and Entity Information [Abstract] Payment Plan Receivables and Other Assets Held for Sale [Abstract] Disclosure for payment plan receivables and other assets held for sale. Payment Plan Receivables And Other Assets Held For Sale [Text Block] Payment Plan Receivables and Other Assets Held for Sale 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] Represents carrying amount of vehicle service contract payment plans purchased from counterparties, net of discount. Payment Plan Receivables Payment plan receivables Refers to liabilities to be assumed related to the sale of the payment plan receivable processing business. Payment Plan Receivable, Liabilities Assumed Liabilities to be assumed Refers to certain other assets related to the sale of the payment plan receivables processing business. Payment Plan Receivable Certain Other Assets Other assets to be sold Schedule of the inputs used in the fair value measurement of assets and liabilities. This disclosure may include, but is not limited to, the fair value of the asset and liability, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs. Fair Value Inputs Assets and Liabilities Quantitative Information [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. Fair Value Inputs Assets and Liabilities Quantitative Information [Line Items] Represents the other real estate commercial loans. Other Real Estate Commercial [Member] Other Real Estate Commercial [Member] Quantitative information about Level 3 fair value measurements measured on a non recurring basis [Abstract] Unobservable Inputs Weighted Average [Abstract] Adjustment for differences between comparable sales used as an input to measure fair value. Fair Value Inputs Adjustment for Differences Between Comparable Sales Adjustment for differences between comparable sales Capitalization rate used as an input to measure fair value. Fair Value Inputs Capitalization Rate Capitalization rate Float rate used as an input to measure fair value. Fair Value Inputs Float Rate Float rate Impaired Loan [Abstract] Impaired loan [Abstract] Commercial impaired loans, fair value disclosure. Impaired Loans Commercial Commercial Amount before allowance of consumer mortgage and revolving loans issued to individuals, including, but not limited to credit card, automobile, boat, student, durable home appliance loans, fair value disclosure. Mortgage, Fair Value Disclosure Mortgage Amount before allowance of commercial loans and leases receivable includes, but not limited to, commercial and industrial loans, agricultural loans, mortgage loans, promissory notes, interbank and other loans to financial institutions, draws against credit facilities, trade financing, lease financings, fair value disclosure. Commercial, Fair Value Disclosure Commercial Ancillary income used as an input to measure fair value. Fair Value Inputs Ancillary Income Ancillary income Cost to service used as an input to measure fair value. Fair Value Inputs, Cost of Service Cost to service Mortgage impaired loans, fair value disclosure. Impaired Loans Mortgage Mortgage Represents the impaired loans mortgage loans. Impaired Loans Mortgage [Member] Impaired Loans Mortgage [Member] Represents the impaired loans commercial. Impaired Loans Commercial [Member] Impaired Loans Commercial [Member] Represents the sales comparison approach to measure fair value. Sales comparison approach [Member] Sales Comparison Approach [Member] Represents the present value of net servicing revenue used to measure fair value. Present Value of Net Servicing Revenue [Member] 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 Represents the other real estate mortgage. Other Real Estate Mortgage [Member] Other Real Estate Mortgage [Member] 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