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 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 AM Best Rating A+ [Member] AM Best, A+ Rating [Member] AM Best Rating, A Ratings [Member] AM Best Rating, B Rating [Member] AM Best, B Rating [Member] AM Best Rating, B+ Rating [Member] AM Best Rating, A- Rating [Member] Award Type [Axis] Number of securities with market fair value less than amortized cost ACCOUNTING POLICIES [Abstract] Accounts, Notes, Loans and Financing Receivable [Line Items] Unrealized Gains (Losses) on Securities Available For Sale [Member] Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment ACCUMULATED OTHER COMPREHENSIVE LOSS [Abstract] Accumulated Other Comprehensive Loss [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 Accumulated other comprehensive loss Accumulated other comprehensive loss for regulatory purposes 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 TO RECONCILE NET INCOME TO NET CASH FROM (USED) IN OPERATING ACTIVITIES Adjustments for New Accounting Pronouncements [Axis] Total Adjustments Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities Total FHLB advances, Amount Advances from the FHLB Advertising Total compensation expense (recovery) recognized Allocated Share-based Compensation Expense Increase (decrease) in allowance for loan losses Allowance for loan losses and recorded investment in loans by portfolio segment Amortization Amortization of Mortgage Servicing Rights (MSRs) Intangible amortization expense Amortization of Intangible Assets 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 Impairment charges recognized [Abstract] Other Asset Backed [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 Fair value Securities available for sale 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] 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 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 Bank owned life insurance Bank Owned Life Insurance Income REGULATORY MATTERS [Abstract] Buildings [Member] Building [Member] Counterparty Name [Axis] Total risk-based capital Capital Total capital to risk-weighted assets [Abstract] Minimum for Adequately Capitalized Institutions, Ratio 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 Recorded Book Balance [Member] Reported Value Measurement [Member] Cash and Cash Equivalents at Beginning of Year Cash and Cash Equivalents at End of Year Cash and Cash Equivalents Cash and Cash Equivalents, at Carrying Value STATEMENTS OF CASH FLOWS 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 Cash Flow Hedge [Member] Cash Flow Hedging [Member] Chief Executive Officer [Member] Class of Stock [Line Items] Stock Reserved [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] COMMITMENTS AND CONTINGENT LIABILITIES Commitments and Contingencies Disclosure [Text Block] Commitments and contingent liabilities Commitments to Extend Credit [Member] COMMITMENTS AND CONTINGENT LIABILITIES [Abstract] Declared (in dollars per share) Common Stock [Member] Common stock, shares issued (in shares) Common stock, par value (in dollars per share) Common Stock Subject to Mandatory Redemption [Member] Common stock, shares authorized (in shares) Common stock, no par value, 500,000,000 shares authorized; issued and outstanding: 21,258,092 shares at December 31, 2016 and 22,251,373 shares at December 31, 2015 Common stock Common stock reserved for issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Common stock, shares outstanding (in shares) Common Stock [Abstract] Communications Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Components of deferred tax assets and liabilities [Abstract] ACCUMULATED OTHER COMPREHENSIVE LOSS Comprehensive Income (Loss) Note [Text Block] Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent COMPREHENSIVE INCOME Concentration Risk Type [Axis] CONCENTRATIONS OF CREDIT RISK Concentration Risk Disclosure [Text Block] Concentration Risk [Line Items] Concentration Risk [Table] Concentration Risk Type [Domain] INDEPENDENT BANK CORPORATION (PARENT COMPANY ONLY) FINANCIAL INFORMATION Condensed Financial Information of Parent Company Only Disclosure [Text Block] Condensed Financial Statements, Captions [Line Items] INDEPENDENT BANK CORPORATION (PARENT COMPANY ONLY) FINANCIAL INFORMATION [Abstract] Consolidated [Member] Consolidated Entities [Member] PRINCIPLES OF CONSOLIDATION Consumer [Member] Retail [Member] Corporate [Member] Credit Rating, AM Best [Axis] Credit Rating, AM Best [Domain] Cumulative effect of change in accounting principle Current expense (benefit) Issue Date Debt Instrument, Issuance Date OTHER BORROWINGS Debt Disclosure [Text Block] OTHER BORROWINGS [Abstract] Interest Rate Term of note Interest Rate Spread Debt Instrument, Basis Spread on Variable Rate Trust Preferred Securities Issued Debt Instrument, Face Amount Maturity Date 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 Deferred tax assets [Abstract] Gross deferred tax assets net of valuation allowance Deferred Tax Assets, Net of Valuation Allowance Loss carryforwards Gross deferred tax assets Deferred Tax Assets, Gross Deferred tax assets, net Deferred tax assets, net Deferred tax assets Allowance for loan losses Share based payments Litigation settlement Deferred compensation Alternative minimum tax credit carry forward Other Deferred Tax Assets, Other Deferred tax liabilities [Abstract] Unrealized loss on trading securities Other Deferred Tax Liabilities, Other Valuation allowance Deferred Tax Assets, Valuation Allowance Maximum matching contribution, percent Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Maximum contribution of employees' eligible wages Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 401(k) and employee stock ownership plans amount expensed Defined Contribution Plan, Cost Recognized DEPOSITS Deposit Liabilities Disclosures [Text Block] DEPOSITS [Abstract] Deposits 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 bearning deposits - time Depreciation, Amortization and Accretion, Net Depreciation expense Derivative Instrument [Axis] 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] Derivatives Derivative financial instruments DERIVATIVE FINANCIAL INSTRUMENTS [Abstract] Notional Amount Derivatives Derivative financial instruments Derivative Liability Gain (Loss) Recognized in Income Fair Value Asset Derivatives Derivative Asset, Fair Value, Gross Asset Liability Derivatives Fair value of derivative instruments, balance sheet location [Abstract] Loss Recognized in Other Comprehensive Income (Loss) (Effective Portion) Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion) Derivative Instruments, Gain (Loss) [Line Items] Derivative Contract [Domain] Hedging Relationship [Axis] Derivative Instruments, Gain (Loss) [Table] Derivatives, Fair Value [Line Items] DERIVATIVE FINANCIAL INSTRUMENTS Director [Member] SHARE BASED COMPENSATION AND BENEFIT PLANS Disclosure of Compensation Related Costs, Share-based Payments [Text Block] SHARE BASED COMPENSATION AND BENEFIT PLANS [Abstract] Cash dividends declared NET INCOME PER COMMON SHARE Earnings Per Share, Policy [Policy Text Block] Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Earnings Per Share Reconciliation [Abstract] Net income per common share Statutory federal income tax rate 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 Equipment [Member] Furniture, fixtures and equipment Equipment Expense Equity Component [Domain] Custodial Escrow Balances Fair Value Measurements [Member] Fair Value [Member] Executive Officers [Member] Asset (Liability) Fair Value [Abstract] Asset Class [Axis] Liability Class [Axis] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Discount rate Measurement Frequency [Axis] FAIR VALUE DISCLOSURES [Abstract] Total Change in Fair Values Included in Current Period Earnings Fair Value, Option, Changes in Fair Value, Gain (Loss) Measurement Basis [Axis] 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 fair values and recorded book balances Fair Value, by Balance Sheet Grouping [Table Text Block] Concentration of risk loans receivable Fair Value Measurement [Domain] 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 Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Changes in fair value for financial assets 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 FHLB advances terminated Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Repayment and Penalties FDIC deposit insurance 2016, Amount Advances from Federal Home Loan Bank ("FHLB") [Member] Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract] Federal home loan bank stock Unused borrowing capacity with FHLB Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds 2018, Amount Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Three Federal Reserve Bank Advances [Member] Federal Reserve Bank Advances [Member] 2019, Amount 2017, Rate 2020, Rate 2017, Amount Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due [Abstract] 2020, Amount 2018, Rate Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, Two to Three Years from Balance Sheet Date 2016, Rate Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due within One Year of Balance Sheet Date Title insurance fees Fees and Commissions, Other Service charges on deposit accounts LOANS HELD FOR SALE Finance, Loan and Lease Receivables, Held-for-sale, Policy [Policy Text Block] 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] Financial Instrument [Axis] 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 Class of Financing Receivable, Type [Axis] 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] 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] Reclassification to loans held for sale Financing Receivable, Reclassification to Held-for-sale Financing Receivable, Impaired [Line Items] Post-modification recorded balance Financing Receivable, Modifications, Post-Modification Recorded Investment Balance at beginning of period Balance at end 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 2022 and thereafter 2018 Total Finite-Lived Intangible Assets, Net Accumulated Amortization 2017 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Other Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Gross Carrying Amount Estimated useful lives 2021 Summary of estimated core deposit intangible amortization [Abstract] Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] 2020 2019 Fixed Income Interest Rate [Member] Other real estate and repossessed assets Other real estate and repossessed assets Foreign Government [Member] Gain on securities [Member] Gain (Loss) on Investments [Member] Net gains on securities Gain on securities Net gains on securities Gain on extinguishment of debt Gain on extinguishment of debt Gains on extinguishment of debt Net (gains) losses on other real estate and repossessed assets Gains (Losses) on Sales of Other Real Estate Net gains (losses) on assets INTANGIBLE ASSETS [Abstract] Hedging Relationship [Domain] 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 recorded 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 Impaired Financing Receivable, Recorded Investment Unpaid Principal Balance, with no related allowance recorded 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] Equity in undistributed net income of subsidiaries Income (Loss) from Equity Method Investments Income Before Income Tax Income (Loss) Before Income Tax and Equity in Undistributed Net Income of Subsidiaries Total reclassifications before tax Income Statement Location [Domain] Income Approach [Member] 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 tax expense Income tax benefit Income tax expense Income tax expense (benefit) CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract] CONDENSED STATEMENTS OF OPERATIONS [Abstract] Statutory rate applied to income before income tax Income tax expense (benefit) [Abstract] Reconciliation of income tax benefit [Abstract] Effective Income Tax Rate Reconciliation, Amount [Abstract] Net change in valuation allowance Non-deductible meals, entertainment and memberships Other, net INCOME TAXES Income Tax, Policy [Policy Text Block] Income taxes Tax-exempt income Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount Deferred income tax expense Deferred income tax benefit Increase (Decrease) in Deferred Income Taxes Increase (decrease) in accrued expenses and other liabilities Increase (decrease) in accrued expenses and other liabilities Net increase in total deposits Fair value option - 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 Decrease 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 INTANGIBLE ASSETS Intangible Assets, Finite-Lived, Policy [Policy Text Block] Other intangibles Intangible assets INTEREST EXPENSE Interest Expense [Abstract] Interest and fees on loans INTEREST INCOME Total Interest Income Interest income Interest and Dividend Income, Operating Total Interest Expense Interest expense Interest expense Interest on securities Accrued interest payable Interest expense on FHLB advances Summary of interest expense on deposits [Abstract] Interest Expense, Deposits [Abstract] Other borrowings Interest Expense, Borrowings Total Deposits Interest Expense, Deposits Time deposits of $100,000 or more Interest Expense, Time Deposits, $100,000 or More Savings and interest bearing checking Interest Expense, NOW Accounts, Money Market Accounts, and Savings Deposits Net Interest Income Interest Income (Expense), Net Interest Income [Member] Time deposits under $100,000 Interest Expense, Time Deposits, Less than $100,000 Net Interest Income After Provision for Loan Losses Interest Income (Expense), after Provision for Loan Loss Taxable Interest-Rate Cap Agreement [Member] 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 Investment in subsidiaries Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Subordinated debentures Subordinated debentures Subordinated Debentures Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Compensation and employee benefits Land [Member] LEASES [Abstract] LEASES Leases of Lessee Disclosure [Text Block] Total Liabilities Liabilities Total Liabilities and Shareholders' Equity Total Liabilities and Shareholders' Equity LIABILITIES AND SHAREHOLDERS' EQUITY LIABILITIES AND SHAREHOLDERS' EQUITY [Abstract] Liabilities and Equity [Abstract] Liabilities [Abstract] Liabilities, Fair Value Disclosure [Abstract] Litigation Status [Axis] Litigation Status [Domain] Repayments Loans and Leases Receivable, Related Parties, Proceeds Total ending allowance balance Allowance for loan losses Loans and Leases Receivable, Allowance Installment ALLOWANCE FOR LOAN LOSSES Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block] Net of deferred loan fees Loans [Abstract] Loans and Leases Receivable, Other Information [Abstract] New loans and advances Loans [Abstract] Loans Net Loans Loans and Leases Receivable, Net Amount Summary of loans and leases receivable [Roll Forward] Loans and Leases Receivable, Related Parties [Roll Forward] Total Loans Total Loans Total Loans Loans and Leases Receivable, Net of Deferred Income Balance at end of year Balance at beginning of year Loans and Leases Receivable, Related Parties Loans held for sale, carried at fair value Loans held for sale Loans held for sale Loans Held For Sale [Member] Contractual Principal Loans Receivable Held-for-sale, Amount LOANS AND PAYMENT PLAN RECEIVABLES Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Commercial Commercial loans Loans Receivable, Gross, Commercial, Financial and Agricultural Commercial and industrial Total Long-term Debt Summary of repayments of FHLB Advances [Abstract] 2019 Long-term Debt, Maturities, Repayments of Principal in Year Three 2018 Long-term Debt, Maturities, Repayments of Principal in Year Two 2020 Long-term Debt, Maturities, Repayments of Principal in Year Four 2017 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months Loss Contingencies [Table] Loss Contingencies [Line Items] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Estimate of reasonably possible loss Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Trust preferred securities Marketable Securities [Table Text Block] SECURITIES Marketable Securities, Policy [Policy Text Block] Net gains on securities Securities Marketable Securities, Gain (Loss), Excluding Other than Temporary Impairments Summary of the maturity of time deposits [Abstract] Maturities of Time Deposits [Abstract] Maximum [Member] Minimum [Member] Mortgage loans in process of foreclosure Mortgage Loans on Real Estate, Loan Type [Domain] Weighted average interest rate Mortgage Loans on Real Estate, Loan Type [Axis] Private Label Mortgage-Backed [Member] U.S. Agency Residential Mortgage-Backed [Member] Vehicle service contract counterparty reserve [Roll Forward] Movement in Valuation Allowances and Reserves [Roll Forward] Non-performing TDR's [Member] CASH FLOW FROM FINANCING ACTIVITIES CASH FLOW USED IN FINANCING ACTIVITIES [Abstract] Net Cash 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 USED IN INVESTING ACTIVITIES CASH FLOW FROM INVESTING ACTIVITIES [Abstract] Net income Net Income Total reclassifications for the period, net of tax Net Income (Loss) Attributable to Parent Net income per common share [Abstract] Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Net income New Accounting Pronouncements or Change in Accounting Principle [Table] ADOPTION OF NEW ACCOUNTING STANDARDS New Accounting Pronouncements, Policy [Policy Text Block] Mortgage loans servicing rights, change in retained deficit, net of tax New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets New Accounting Standrads [Abstract] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Non-interest bearing NON-INTEREST INCOME NON-INTEREST EXPENSE OTHER NON-INTEREST INCOME [Abstract] Total Non-interest Expense Noninterest Expense Total Non-Interest Income Noninterest Income Other Total other non-interest income Noninterest Income, Other Operating Income Promissory Note [Member] 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 OPERATING INCOME [Abstract] Total Operating Leases, Future Minimum Payments Due OPERATING EXPENSES [Abstract] 2018 Operating Leases, Future Minimum Payments, Due in Two Years Total Operating Expenses Operating Expenses Summary of future minimum lease payments under non-cancelable operating leases [Abstract] Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2017 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2022 and thereafter Operating Leases, Future Minimum Payments, Due Thereafter Rental expense on operating leases Operating Leases, Rent Expense, Net Total Operating Loss Carryforwards 2019 Operating Leases, Future Minimum Payments, Due in Three Years Total Operating Income Operating Income (Loss) 2020 Operating Leases, Future Minimum Payments, Due in Four Years 2021 Operating Leases, Future Minimum Payments, Due in Five Years Income tax expense (benefit) Other Comprehensive Income (Loss), Available-for-sale Securities, Tax Other real-estate [Abstract] Income tax expense Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Reclassification adjustments for gains included in earnings Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Other Real Estate [Roll Forward] Unrealized gains recognized in other comprehensive income (loss) on derivative instruments Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax Unrealized gains (losses) recognized in other comprehensive income (loss) on securities available for sale, 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] Other than temporary impairment loss on securities Securities impairment recognized in earnings Net impairment loss recognized in earnings OTTI changes recorded in earnings Total impairment loss Net impairment loss recognized in earnings Other than Temporary Impairment Losses, Investments, Available-for-sale Securities Balance at beginning of period Balance at end of period Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held Loss recognized in other comprehensive income (loss) Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Including Portion Attributable to Noncontrolling Interest Additions to credit losses on securities for which no previous OTTI was recognized Unrealized gains (losses) recognized in other comprehensive income (loss) 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 Total Other borrowings Other Borrowings Accrued income and other assets Accrued income and other assets Unrealized gains 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 Derivative instruments Unrealized gain (loss) arising during period Other investments Administrative and other expenses Accrued expenses and other liabilities Accrued expenses and other liabilities Other Other Noninterest Expense Other income Other Operating Income Other Assets [Member] Other comprehensive income (loss) Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent [Abstract] Other Liabilities [Member] Other comprehensive income (loss) Other comprehensive income (loss) Net current period 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 Past Due Financing Receivables [Table Text Block] Parent Company [Member] Parent Company [Member] Disbursements for loans held for sale Payments for Origination of Mortgage Loans Held-for-sale Share based compensation withholding obligation 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 Redemptions of trust preferred securities at par value 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 Pending Litigation [Member] 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, Shares Issued 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 President [Member] RECLASSIFICATION 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 issuance of common stock Proceeds from Federal Home Loan Bank advances Proceeds from Federal Home Loan Bank Borrowings 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 Proceeds from the sale of property and equipment Legal and professional Estimated useful lives Property, Plant and Equipment, Useful Life Property, Plant and Equipment, Type [Domain] PROPERTY AND EQUIPMENT PROPERTY AND EQUIPMENT [Abstract] Property and Equipment [Abstract] Summary of property and equipment Property, Plant and Equipment [Table Text Block] Property and equipment, net Property and equipment, Net Property, Plant and Equipment [Line Items] Property and equipment, Gross Property, Plant and Equipment, Type [Axis] PROPERTY AND EQUIPMENT Property, Plant and Equipment Disclosure [Text Block] Provision for loan losses Provision for loan losses Additional provision for loan losses on impaired loans Range [Axis] Range [Domain] OTHER REAL ESTATE [Abstract] Additions charged to expense Real Estate Owned, Valuation Allowance, Provision Real Estate Owned Valuation Allowance [Roll Forward] Direct write-downs upon sale Real Estate Owned, Valuation Allowance, Amounts Applied OTHER REAL ESTATE Real Estate Owned [Text Block] Balance at end of year Balance at beginning of year Other real estate, valuation allowance Real Estate Owned, Valuation Allowance Credit losses recognized in earnings on securities available for sale LOANS AND PAYMENT PLAN RECEIVABLES [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 [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] Changes in unrecognized tax benefits [Roll Forward] REGULATORY MATTERS Regulatory Capital Requirements under Banking Regulations [Text Block] RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] Directors and executive officers deposit Related Party Transaction [Line Items] RELATED PARTY TRANSACTIONS [Abstract] Payments of Federal Home Loan Bank Advances Repayments of Federal Home Loan Bank Borrowings Redemption of subordinated debt Repayments of Subordinated Debt Counterparty Name [Domain] Residential Real Estate [Member] Residential First Mortgages [Member] Residential Mortgage [Member] Mortgage [Member] Mortgage [Member] Cumulative Retrospective Adjustments [Member] Restatement Adjustment [Member] RESTRICTIONS ON CASH AND DUE FROM BANKS Restricted Assets Disclosure [Text Block] Restricted Stock [Member] RESTRICTIONS ON CASH AND DUE FROM BANKS [Abstract] Accumulated Deficit [Member] Accumulated deficit LOAN REVENUE RECOGNITION CONCENTRATIONS OF CREDIT RISK [Abstract] Exercisable, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value 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 Outstanding, Weighted-Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Exercisable, Weighted-Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Estimated amortization of other intangible assets Scenario, Unspecified [Domain] Originally Presented [Member] Scenario, Previously Reported [Member] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Composition of income tax expense (benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of accumulated other comprehensive loss (AOCL), net of tax Summary of deferred tax assets and deferred tax liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Summary of non-vested restricted stock and stock units and transactions Schedule of Finite-Lived Intangible Assets [Table] 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] Summary of loans to directors and executive officers Schedule of Related Party Transactions [Table Text Block] Schedule of Financing Receivables Past Due [Table] CONDENSED STATEMENTS OF FINANCIAL CONDITION Condensed Balance Sheet [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of changes in unrecognized tax benefits CONDENSED STATEMENTS OF CASH FLOWS Condensed Cash Flow Statement [Table Text Block] Reconciliation of basic and diluted loss 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] Summary of future minimum lease payments under non-cancelable operating leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Investments in a continuous unrealized loss position CONDENSED STATEMENTS OF OPERATIONS Condensed Income Statement [Table Text Block] Reconciliation of income tax benefit computed by applying the statutory federal income tax rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Schedule of Available-for-sale Securities [Table] Schedule of Condensed Financial Statements [Table] Schedule of Available-for-sale Securities [Line Items] Actual capital amounts and ratios 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] 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 Short-term Debt [Table] Schedule of Related Party Transactions, by Related Party [Table] Schedule of information regarding subordinated debentures Schedule of Subordinated Borrowing [Table Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Axis] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Fair value of derivative instruments Schedule of Stock by Class [Table] Loan portfolios Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Effect of derivative financial instruments on consolidated statement of operation Operating Segments [Abstract] Segment Reporting [Abstract] OPERATING SEGMENTS Geographical [Domain] Originated servicing rights capitalized Capitalized mortgage loan servicing rights Balance at end of year Balance at beginning of year Fair value of capitalized mortgage loan servicing rights Average discount rate Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate Change in valuation allowance Mortgage loan servicing, net Information regarding options exercised [Abstract] Share based compensation Share-based Compensation Forfeited (in dollars per share) Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 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] 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) 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, beginning balance (in shares) Outstanding, ending 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) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted-Average Remaining Contractual Term (Years) [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Intrinsic value Vested (in dollars per share) 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 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Outstanding, beginning balance (in shares) Outstanding, ending 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)