Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Other Other Noninterest Expense, Adjusted Other Noninterest Expense, Adjusted Income tax expense (benefit) Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, Tax Independent Bank Independent Bank [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. FHLB, advances, fixed rate, terminated Federal Home Loan Bank, Advances, Fixed Rate, Terminated Federal Home Loan Bank, Advances, Fixed Rate, Terminated 700-749 FICO Score, 700 to 749 [Member] From 700 to 749 credit score as defined by the external credit rating agency, Fair Isaac Corporation (FICO). Element name and standard label in FICO Score [numeric lower end] to [numeric higher end] [Member] format. Award Timing Predetermined Award Timing Predetermined [Flag] Share-based compensation Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Percent Income tax expense OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax Entity File Number Entity File Number Long-Term Incentive Plans Long-Term Incentive Plans [Member] A reward system designed to improve employees' long-term performance by providing rewards that may not be tied to the entity's share price. Tabular List, Table Tabular List [Table Text Block] Other Noninterest Income, Other Operating Income, Adjusted Noninterest Income, Other Operating Income, Adjusted ADOPTION OF NEW ACCOUNTING STANDARDS New Accounting Pronouncements, Policy [Policy Text Block] ATM fees Fees ATM Cards Amount of income earned from ATM cards. Income Before Equity in Undistributed Net Income of Subsidiaries Income Loss from Continuing Operations Before Equity In Undistributed Net Loss Of Subsidiaries Sum of operating profit and nonoperating income or expense before equity in undistributed net loss of subsidiaries. Summary of Loans to Directors and Executive Officers Schedule of Related Party Transactions [Table Text Block] Estimated Fair Values and Recorded Book Balances Fair Value, by Balance Sheet Grouping [Table Text Block] Subordinated Borrowings [Abstract] Subordinated Borrowings [Abstract] Measurement Basis [Axis] Measurement Basis [Axis] Advances year one, rate Federal Home Loan Bank, Advance, Maturity, Average Interest Rate, Year One Adjustment to Compensation: Adjustment to Compensation [Axis] RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] REVENUE FROM CONTRACTS WITH CUSTOMERS Revenue from Contract with Customer [Text Block] Accretion of net unrealized losses on securities transferred to held to maturity OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax Share-based compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost Financing Receivable Portfolio Segment Financing Receivable Portfolio Segment [Domain] Recoveries credited to allowance Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery Trust preferred securities Trust Preferred Securities Including the current and noncurrent portions, the carrying value of preferred securities trust that embody an unconditional obligation requiring the issuer to redeem the securities by transferring the funds at a specified or determinable date (or dates) or upon an event that is certain to occur, that are issued by a consolidated trust to outside investors where the trust uses the proceeds of the issuance of those securities to purchase, from the financial institution that established the trust on balance sheets date. Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Summary of Reciprocal Deposits Summary Of Reciprocal Deposits [Table Text Block] Tabular disclosure of summary of reciprocal deposits. Maximum number of consecutive quarterly losses recorded for profitability requirement Maximum Number Of Consecutive Quarterly Losses Recorded For Profitability Requirement Refers to maximum number of consecutive quarterly losses recorded for profitability requirement. Minimum for adequately capitalized institutions, ratio Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum Interest rate cap agreements Interest Rate Cap [Member] Current expense Current Income Tax Expense (Benefit) Maturing after one year but within five years Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five Adjustment to Compensation, Amount Adjustment to Compensation Amount Debt Instrument, unamortized discount (premium) and debt issuance costs, net Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Increase in accrued income and other assets (Increase) decrease in accrued income and other assets Increase (Decrease) in Other Operating Assets PRINCIPLES OF CONSOLIDATION Consolidation, Policy [Policy Text Block] Schedule of Loans and Financing Receivables Serviced For Others [Line Items] Schedule Of Loans And Financing Receivables Serviced For Others [Line Items] 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. Share based compensation Share-Based Payment Arrangement, Noncash Expense Securities premium amortization Deferred Tax Asset, Securities Premium Amortization Deferred Tax Asset, Securities Premium Amortization Notional Amount Derivative Asset, Notional Amount Share-Based Payment Arrangement, Option Share-Based Payment Arrangement, Option [Member] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Net losses on securities available for sale Debt and Equity Securities, Realized Gain (Loss) STATEMENTS OF CASH FLOWS Cash and Cash Equivalents, Policy [Policy Text Block] Net Loans Financing Receivable, after Allowance for Credit Loss Federal income taxes Income Taxes Paid Percent Effective Income Tax Rate Reconciliation, Percent [Abstract] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Schedule of Other Key Terms for Subordinated Debentures and Trust Preferred Securities Schedule Of Subordinated Debentures And Trust Preferred Securities [Table Text Block] Tabular disclosure of subordinated debentures and trust preferred securities. Cash dividends declared Dividends, Common Stock, Cash Total Shareholders’ Equity Balances at beginning of period Balances at end of period Total shareholders’ equity Equity, Attributable to Parent Measurement Frequency [Axis] Measurement Frequency [Axis] Maturing after five years but within ten years Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10 Debt Securities, Available-for-Sale [Table] Debt Securities, Available-for-Sale [Table] Insider Trading Policies and Procedures [Line Items] Total securities held-to-maturity, amortized cost Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date Summary of Property and Equipment Property, Plant and Equipment [Table Text Block] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Visa Visa [Member] Visa Assets Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Issuance of common stock (in shares) Stock Issued During Period, Shares, New Issues Fannie Mae Fannie Mae [Member] Refers to Mortgage loans serviced for Fannie Mae. Reciprocal deposits included in deposits with stated maturity Reciprocal Deposits Included In Deposits, With Stated Maturity Total amount of reciprocal deposits included in deposits with stated maturity. Measured at Fair Value on a Recurring Basis Fair Value, Recurring [Member] Minimum for Well-Capitalized Institutions Banking Regulation, Tier 1 Leverage Capital, Well Capitalized, Minimum Liabilities and Shareholders’ Equity LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity [Abstract] Minimum for Well-Capitalized Institutions Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Well Capitalized, Minimum Common Stock Issued Common Stock Issued By Trust Aggregate stated amount of common stock issued by trusts. Cover [Abstract] Cover [Abstract] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Amortized Cost Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss Maximum Maximum [Member] Transfers to other real estate and repossessed assets Real Estate Owned, Transfer to Real Estate Owned Exercisable, period end (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Finite-lived intangible asset, useful life Finite-Lived Intangible Asset, Useful Life Property, Plant and Equipment, Net [Abstract] Property, Plant and Equipment, Net [Abstract] Total Finite-Lived Intangible Assets, Net Debt securities, available-for-sale, fair value, total Debt Securities, Available-for-Sale, Unrealized Loss Position Maturing after ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Restricted Stock Restricted Stock [Member] Commitments and Contingencies [Table] Commitments and Contingencies [Table] Commitments and Contingencies Minimum for Well-Capitalized Institutions Banking Regulation, Tier 1 Risk-Based Capital, Well Capitalized, Minimum Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] CONCENTRATIONS OF CREDIT RISK Concentration Risk Disclosure [Text Block] Commercial and industrial Commercial And Industrial [Member] Class of financing receivables related to commercial and industrial financing receivables. COMMITMENTS TO EXTEND CREDIT AND RELATED FINANCIAL INSTRUMENTS Off-Balance-Sheet Credit Exposure, Policy [Policy Text Block] Unrealized Losses on Securities Transferred to Securities HTM Accumulated Other Comprehensive Income Loss, Unrealized Losses on Securities Transferred to Securities Held to Maturity [Member] Accumulated Other Comprehensive Income Loss, Unrealized Losses on Securities Transferred to Securities Held to Maturity Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] External Credit Rating, Standard & Poor's External Credit Rating, Standard & Poor's [Domain] Comparability adjustment Measurement Input, Comparability Adjustment [Member] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Other assets Other Assets [Member] Time Interest Expense Domestic Deposit Liabilities, Time Deposit Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Troubled loan modification, term increase Financing Receivable, Modified, Weighted Average Term Increase from Modification Income Before Income Tax Income before income tax Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Actual, ratio Banking Regulation, Tier 1 Leverage Capital Ratio, Actual Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Common Stock, Number of Shares, Par Value and Other Disclosure [Abstract] Interest on securities Interest and Dividend Income, Securities, by Taxable Status [Abstract] 1-4 family owner occupied - non-jumbo Family 1 4, Owner Occupied, Non-Jumbo [Member] Class of financing receivables related to 1-4 family owner occupied non-jumbo financing receivables. Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Proceeds from the sale of property and equipment Proceeds from Sale of Property, Plant, and Equipment Held to maturity securities, without single maturity date, fair value Debt Securities, Held-to-Maturity, Maturity, without Single Maturity Date, Fair Value Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Unrealized loss on securities AFS Deferred Tax Asset, Debt Securities, Available-for-Sale, Unrealized Loss Total Interest Expense Interest expense Interest Expense, Operating Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Troubled loan modifications to total loans, percentage Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage Net Gains (Losses) on Assets -Mortgage Loans Family 1-4 [Member] Class of financing receivables related to 1-4 family financing receivables. Midwest Guaranty Trust I Subsidiaries Trust Four [Member] Subsidiaries trust which is controlled, directly or indirectly, by its parent. The usual condition for control is ownership of a majority (over 50%) of the outstanding voting stock. The power to control may also exist with a lesser percentage of ownership, for example, by contract, lease, agreement with other stockholders or by court decree. Document Fiscal Period Focus Document Fiscal Period Focus Goodwill and other intangibles Intangible Assets, Net (Including Goodwill) Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Average PSA rate Servicing Assets And Servicing Liabilities At Fair Value, Assumptions Used To Estimate Fair Value, Discount Rate, Average PSA Rate The average PSA rate used to estimate the fair value of servicing assets and servicing liabilities. Schedule of Fair Value Option, Disclosures Fair Value Option, Disclosures [Table Text Block] Award Timing Method Award Timing Method [Text Block] Total Non- Accrual Financing Receivable, Excluding Accrued Interest, Nonaccrual Award Type [Axis] Award Type [Axis] Hedging Relationship Hedging Relationship [Domain] Parent Company Parent Company [Member] SHARE BASED COMPENSATION Share-Based Payment Arrangement [Policy Text Block] Trading Symbol Trading Symbol 2029 Lessee, Operating Lease, Liability, to be Paid, Year Four Dividend Reinvestment Plan Dividend Reinvestment Plan [Member] A plan offered by a corporation that allows investors to reinvest their cash dividends by purchasing additional shares or fractional shares on the dividend payment date. Tax-exempt Interest Income, Securities, Operating, Tax Exempt Loan and collection Loan and collection Loan And Collection Expenses generally relating to the origination of loans (not subject to capitalization), the collection of loans and maintaining other real estate and repossessed assets. Share based compensation (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Entity Address, City or Town Entity Address, City or Town Asset Impairment Charges [Abstract] Asset Impairment Charges [Abstract] Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] Securities available for sale Net losses on sales of securities available for sale Marketable Security, Gain (Loss) 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 Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Advances, year five, rate Federal Home Loan Bank, Advance, Maturity, Average Interest Rate, Year Five Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Non-Employee Directors Non Employee Directors [Member] Person serving on the board of directors (who collectively have responsibility for governing the entity), but are non employees. Demand Reciprocal Demand Deposits Amount of reciprocal demand deposits. Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Debt Securities, Held-to-Maturity, Credit Quality Debt Securities, Held-to-Maturity, Credit Quality Indicator [Table Text Block] Reductions due to settlements Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Summary of the maturity of time deposits [Abstract] Maturities of Time Deposits [Abstract] Entity Emerging Growth Company Entity Emerging Growth Company FEDERAL RESERVE BANK (‘‘FRB’’) STOCK Federal Reserve Bank Stock [Policy Text Block] The entire policy disclosure represents an equity interest in the Federal Reserve Bank. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). Actual, ratio Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Actual OTHER REAL ESTATE AND REPOSSESSED ASSETS Other Real Estate And Repossessed Assets [Policy Text Block] Disclosure of accounting policy for other real estate and repossessed assets. Debt Securities, Held-to-Maturity Debt Securities, Held-to-Maturity [Table Text Block] Collateral dependent loans, valuation allowance Collateral Dependent Loans, Valuation Allowance The valuation allowance on loans measured for impairment, using the fair value of collaterals. Outstanding, beginning balance (in shares) Outstanding, ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number INDEPENDENT BANK CORPORATION (PARENT COMPANY ONLY) FINANCIAL INFORMATION Condensed Financial Information of Parent Company Only Disclosure [Text Block] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Gain (Loss) Recognized in Income Derivative, Gain (Loss) on Derivative, Net Total Non-interest Income Noninterest Income Common Class C Common Class C [Member] Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Accounts receivable, credit loss expense (reversal) Accounts Receivable, Credit Loss Expense (Reversal) Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] Mortgage loans Net gains on mortgage loans Net gains on mortgage loans Gain (Loss) on Sales of Loans, Net Net loans and loans held for sale Net Loans And Loans Held For Sale, Fair Value Disclosure 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. Debt securities, held-to-maturity, unrecognized losses Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss LOANS Loans, Notes, Trade and Other Receivables Disclosure [Text Block] NON-INTEREST EXPENSE Noninterest Expense [Abstract] Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Cash and due from banks Cash and Due from Banks Class of Financing Receivable Class of Financing Receivable [Domain] Investment and insurance commissions Investment And Insurance Commissions Investment and insurance commissions include fees and commissions from asset management, custody, recordkeeping, investment advisory and other services provided to our customers. Mortgage loans serviced Principal Amount Outstanding On Loans Serviced For Others This is the principal amount outstanding for mortgage loans serviced for others. 90+ and Still Accruing Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing Interest income Non Performing Loan Interest Income Recorded Amount of interest that was recorded on non-performing loans. Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] OTHER INTANGIBLES Intangible Assets, Finite-Lived, Policy [Policy Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Maturing after one year but within five years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Troubled loan modification, interest rate reduction, percent Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, 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] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Income tax expense Income tax expense Income tax benefit Income Tax Expense (Benefit) Pledged securities with book value Book Value Of Pledged Securities The net book value of securities were pledged to secure borrowings, public deposits and for other purposes as required by law. Performance-based compensation expense Incentive Based Compensation Expense Represents the expense recognized during the period arising from compensation arrangements for performance programs with employees, directors and certain consultants qualifying for treatment as employees. Interest rate spread, percent Debt Instrument, Basis Spread on Variable Rate Accrued income and other assets Accrued income and other assets Other Assets Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Credit Rating, Standard & Poor's [Axis] Credit Rating, Standard & Poor's [Axis] Servicing asset Servicing Asset, Measurement Input 2031 and thereafter Time Deposit Maturities, after Year Five Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Collateral-dependent Loans by Class [Abstract] Collateral-Dependent Loans By Class [Abstract] Collateral-dependent Loans by Class [Abstract] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Hedging Relationship [Axis] Hedging Relationship [Axis] Property and equipment, gross Property, Plant and Equipment, Gross Watch (7-8) Watch 7-8 [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. Investment sold (in shares) Investment Sold, Shares Investment Sold, Shares Maturing within one year Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Subordinated Debentures Subordinated Debentures [Member] Subordinated Debentures COMMON STOCK Stockholders' Equity, Policy [Policy Text Block] Current conversion ratio Equity Investment, Conversion Ratio Ratio applied to the conversion of one type or class of equity instrument into another type or class of equity instrument. Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Account service charges Account Service Charges [Member] Revenues are earned on depository accounts for commercial and retail customers and include fees for transaction-based, account maintenance services. Tier 1 capital to risk-weighted assets Banking Regulation, Tier 1 Risk-Based Capital [Abstract] Cash proceeds received Proceeds from Stock Options Exercised All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] 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 Long-Term Incentive Plan Long-Term Incentive Plan [Member] The entity's equity-based compensation arrangement plan. Tax-exempt interest income Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent LOSS CONTINGENCIES Commitments and Contingencies, Policy [Policy Text Block] Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Deferred tax liabilities Deferred Tax Liabilities, Gross [Abstract] Other Total other non-interest income Noninterest Income, Other Operating Income 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 Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Schedule of Components Of Regulatory Capital Components Of Regulatory Capital [Table Text Block] Tabular disclosure of components of regulatory capital. Maximum percentage of decline in net worth for two consecutive quarters Maximum Percentage Of Decline In Net Worth For Two Consecutive Quarters Refers to maximum percentage of decline in net worth for two consecutive quarters. Net Cash From Operating Activities Net Cash From Operating Activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Debt instrument, term Debt Instrument, Term Deposits with stated maturity Deposits, With Stated Maturity, Fair Value Disclosure Deposits, With Stated Maturity, Fair Value Disclosure Proceeds from the sale of securities available for sale Proceeds from Sale of Debt Securities, Available-for-Sale Securities available for sale Total securities available-for-sale, fair value Debt Securities, Available-for-Sale, Excluding Accrued Interest Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Estimated useful lives Property, Plant and Equipment, Useful Life Subsequent Event Subsequent Event [Member] Net Interest Income Interest expense Net interest income Interest Income (Expense), Operating Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Federal Home Loan Bank, Advances, Variable Rate Federal Home Loan Bank, Advances, Variable Rate [Member] Federal Home Loan Bank, Advances, Variable Rate PEO Total Compensation Amount PEO Total Compensation Amount Actual Banking Regulation, Tier 1 Risk-Based Capital, Actual Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Depreciation Depreciation Number of days past due Number of Past Due Days for Commercial Loan, Installment Loans and Payment Plan Receivables Number of past due days for commercial loan, installment loans and payment plan receivables when accrual of interest income is discontinued, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter. 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 Liability Derivatives Derivative Liability, Subject to Master Netting Arrangement, before Offset Net income per common share Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Equity Components [Axis] Equity Components [Axis] Financing receivable, year four, originated, three years before current fiscal year Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Standby letters of credit Standby Letters of Credit [Member] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Number of reportable segments Number of Reportable Segments Expired (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period Transaction expense Mortgage Loan Servicing Rights, Sale Transaction Expense Mortgage Loan Servicing Rights, Sale Transaction Expense IBC Capital Finance III Subsidiaries Trust Two [Member] Subsidiaries trust which is controlled, directly or indirectly, by its parent. The usual condition for control is ownership of a majority (over 50%) of the outstanding voting stock. The power to control may also exist with a lesser percentage of ownership, for example, by contract, lease, agreement with other stockholders or by court decree. Number of lives of group flexible premium non-participating variable life insurance contract Group Flexible Premium Non-Participating Variable Life Insurance Contract Number of lives of group flexible premium non-participating variable life insurance contract that the company purchased. Net increase in portfolio loans (loans originated, net of principal payments) Net (Increase) Decrease of Portfolio Loans, Originated net of Principal Payments The net cash inflow or outflow for the (increase) decrease in the beginning and end of period of portfolio loan balances originated net of principal payments. Entity Address, State or Province Entity Address, State or Province Total Interest Income Interest income Interest and Dividend Income, Operating Financial Asset, Aging Financial Asset, Aging [Domain] Servicing asset fair value Servicing Asset Loans receivable, fair value disclosure Loans Receivable, Fair Value Disclosure Distribution deferral period, maximum quarters Distribution Deferral Period Subordinated Debentures For an issue of Subordinated Debentures, maximum distribution deferral period (payments of interest). Other comprehensive income Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent [Abstract] Individual: Individual [Axis] 401(k) and employee stock ownership plans, amount expensed Defined Contribution Plan, Cost Document Annual Report Document Annual Report Present value of net servicing revenue Present Value Of Net Servicing Revenue [Member] Represents the present value of net servicing revenue used to measure fair value. Amortization Amortization Average coupon rate Servicing Assets And Servicing Liabilities At Fair Value, Assumptions Used To Estimate Fair Value, Average Coupon Rate The average coupon rate used to estimate the fair value of servicing assets and servicing liabilities. Real Estate Owned Valuation Allowance [Roll Forward] Real Estate Owned Valuation Allowance [Roll Forward] Commercial real estate Commercial Real Estate Loan [Member] Loan to finance the purchase of commercial real estate, including but not limited to, land or building. Available-for-sale securities, without single maturity, amortized cost Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost 750-799 FICO Score, 750 to 799 [Member] From 750 to 799 credit score as defined by the external credit rating agency, Fair Isaac Corporation (FICO). Element name and standard label in FICO Score [numeric lower end] to [numeric higher end] [Member] format. Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Minimum for Adequately Capitalized Institutions Banking Regulation, Tier 1 Risk-Based Capital, Capital Adequacy, Minimum Entity Interactive Data Current Entity Interactive Data Current Modification, number of loans Financing Receivable, Modifications, Number Of Contracts Financing Receivable, Modifications, Number Of Contracts Boat lending Boat Lending [Member] Class of financing receivables related to boat lending financing receivables. Provision for credit losses Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Credit Loss Expense (Reversal) INTEREST INCOME Interest and Dividend Income, Operating [Abstract] Exercisable, aggregate intrinsic value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Total Non-interest Expense Noninterest Expense Non accrual loan interest income Deferred Tax Assets, Non Accrual Loan Interest Income Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from non accrual loan interest income. Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] TRANSFERS OF FINANCIAL ASSETS Transfers and Servicing of Financial Assets, Policy [Policy Text Block] Deposits Total Interest Expense, Deposits Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] NON-INTEREST INCOME Noninterest Income [Abstract] Deposits with no stated maturity Deposits, No Stated Maturity, Fair Value Disclosure Amount of all domestic deposit liabilities with no stated maturity. Asset management revenue Asset Management Revenue [Member] Investment and insurance commissions include fees and commissions from asset management, custody, recordkeeping, investment advisory and other services provided to our customers. GOODWILL Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Condensed Financial Statements [Table] Condensed Financial Statements [Table] Common Stock Issued Common Stock Subject to Mandatory Redemption [Member] Customer Customer [Domain] Entity central index key Entity Central Index Key PEO Name PEO Name Visa Class B-2 Visa Class B-2 [Member] Visa Class B-2 Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Loan Ratings by Loan Class Financing Receivable Credit Quality Indicators [Table Text Block] Mortgage loan servicing, net Mortgage Loan Servicing Income Income from servicing real estate mortgages held by others net of any related impairment of capitalized service costs. Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Maximum matching contribution, percent Defined Contribution Plan, Maximum Annual Contributions, Employer, Percent Maximum percentage of employee gross pay the employer may contribute to a defined contribution plan. Land and land improvements Land and Land Improvements [Member] Disbursements for loans held for sale Payment for Origination, Loan, Mortgage, Held-for-Sale Minimum for Adequately Capitalized Institutions Banking Regulation, Tier 1 Leverage Capital, Capital Adequacy, Minimum Non-interest bearing Noninterest-Bearing Deposit Liabilities Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] FAIR VALUES OF FINANCIAL INSTRUMENTS Financial Instruments Disclosure [Text Block] Schedule of Derivative Instruments in Statement of Financial Condition, Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Minimum for adequately capitalized institutions, ratio Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum Purchase premiums, net Deferred Tax Liabilities Purchase Premiums Net Amount of deferred tax liability attributable to taxable temporary differences from purchase premiums, net. Common stock, par value (in dollars per share) Common Stock, No Par Value U.S. statutory rate applied to income before income tax Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Subsequent Event Type [Axis] Subsequent Event Type [Axis] Mandatory commitments to sell mortgage loans Mandatory Commitments To Sell Mortgage Loans [Member] Mandatory commitments to sell mortgage loans derivative financial instrument. Term of variable rate (in months) Debt Instrument, Term of Variable Rate Percentage Term of the interest rate that fluctuates over time as a result of an underlying benchmark interest rate or index, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Number of consecutive payments for mortgage loans missed Number Of Consecutive Mortgage Loan Payments Missed Number of consecutive payments for mortgage loans and the borrower's capacity to repay the loan and collateral values appear insufficient for each loan class. Fair Value Option, Disclosures [Table] Fair Value Option, Disclosures [Table] Summary of interest expense on deposits [Abstract] Interest Expense, Deposits [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Additional General Disclosures [Abstract] Balance Sheet Location [Axis] Statement of Financial Position Location, Balance [Axis] Subordinated Borrowing [Line Items] Subordinated Borrowing [Line Items] 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Three Balance at beginning of year, net of valuation allowance Balance at end of year, net of valuation allowance Real Estate Acquired Through Foreclosure Financing receivable, before allowance for credit loss Financing Receivable, before Allowance for Credit Loss Auditor Information [Abstract] Auditor Information Deferred tax assets Deferred Tax Assets, Net [Abstract] Gross Carrying Amount Finite-Lived Intangible Assets, Gross Purchases of interest bearing deposits - time Payments For In Interest Bearing Deposits In Banks Time The net cash outflow for the purchase of Interest-bearing Deposits-Time by banks in other financial institutions with maturities greater than three months including, for example, certificates of deposits. Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Originated servicing rights capitalized Servicing Asset at Amortized Cost, Additions Entity Address, Address Line One Entity Address, Address Line One LOANS HELD FOR SALE Financing Receivable, Held-for-Sale [Policy Text Block] Repayment of subordinated debt Repayments of Subordinated Debt Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Increase (decrease) in accrued expenses and other liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Non-deductible meals, entertainment and memberships Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Percent Investments Investments [Domain] Share-based compensation withholding obligation (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment Internal Credit Assessment [Domain] DERIVATIVE FINANCIAL INSTRUMENTS Derivative Instruments and Hedging Activities Disclosure [Text Block] Other liabilities Other Liabilities [Member] Fair Value as of Grant Date Award Grant Date Fair Value Non-rated External Credit Rating Agency, Non-rated Member [Member] 'Not rated by external credit rating agency. Derivative Instrument Detail [Abstract] Derivative Instrument Detail [Abstract] Health Care and Social Assistance Health Care and Social Assistance [Member] Refers to concentration of credit risk to health care and social assistance. Financing receivable, year five, originated, four years before current fiscal year Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year Property, Plant and Equipment, Useful Life [Abstract] Property, Plant and Equipment, Useful Life [Abstract] Property, Plant and Equipment, Useful Life [Abstract] Summary of Other Borrowings Schedule of Long-Term Debt Instruments [Table Text Block] Compensation and employee benefits Labor and Related Expense Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Private label mortgage-backed Mortgage-Backed Securities, Issued by Private Enterprises [Member] Total Adjustments Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity Effect of stock options (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Minimum for adequately capitalized institutions, ratio Banking Regulation, Tier 1 Leverage Capital Ratio, Capital Adequacy, Minimum Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Title of Individual Title and Position [Domain] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Share-based payment arrangement, nonvested award, cost not yet recognized, amount Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Related Party Transaction [Line Items] Related Party Transaction [Line Items] Debt securities, available-for-sale, fair value, less than twelve months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Percentage of loan portfolio secured by real estate Percentage Of Loan Portfolio Secured By Real Estate Refers to percentage of loan portfolio which was secured by real estate as on balance sheet date. Actual, ratio Banking Regulation, Tier 1 Risk-Based Capital Ratio, Actual Bank owned life insurance Bank Owned Life Insurance Income DEPOSITS Deposit Liabilities Disclosures [Text Block] Accrued Interest Non Performing Loan Interest Income Amount of interest that would have been accrued if non-performing loans continued to accrue interest according to their original terms. Schedule of Quantitative Information About Level 3 Fair Value Measurements Measured on a Recurring Basis and Non-recurring Basis Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Accrued interest receivable Interest Receivable, Current Financial Instrument Performance Status [Axis] Financial Instrument Performance Status [Axis] Mortgage loans serviced for: Counterparty Name [Domain] Financing Receivable, Nonaccrual Financing Receivable, Nonaccrual [Table Text Block] 2027 Lessee, Operating Lease, Liability, to be Paid, Year Two Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Loans [Abstract] Loans and Leases Receivable, Net Amount [Abstract] Condensed Financial Information Disclosure [Abstract] Condensed Financial Information Disclosure [Abstract] Reserved for Future Issuance [Abstract] Reserved for Future Issuance [Abstract] Reserved for Future Issuance [Abstract] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Outstanding, weighted-average remaining contractual term Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Investment Type [Axis] Investment Type [Axis] Investments Investments Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Shareholder equity threshold not exceeded by revenue or taxing authority amount, percentage State And Political Subdivision Shareholders' Equity Threshold Percentage of consolidated shareholders' equity to compare against investment obligations of state and political subdivisions. Non-PEO NEO Non-PEO NEO [Member] Outstanding, aggregate intrinsic value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Advances from the FHLB Advance from Federal Home Loan Bank Dividends from subsidiary Dividends From Subsidiary Dividends paid to the parent company by its wholly owned subsidiary. Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Schedule of 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. Debt securities, available-for-sale, unrealized gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Performance share units (in shares) Weighted Average Number Of Performance Shares Stock Refers to number of weighted average performance stock units. Award Type Award Type [Domain] 2026 Lessee, Operating Lease, Liability, to be Paid, Year One Unrealized losses arising during period Gain (loss) Recognized in Other Comprehensive Income (Effective Portion) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Purchased tax credits Purchased tax credits Effective Income Tax Rate Reconciliation, Purchased Tax Credit, Amount Effective Income Tax Rate Reconciliation, Purchased Tax Credit, Amount Equity Awards Adjustments Equity Awards Adjustments [Member] Subordinated Debentures Subordinated Debentures Subject to Mandatory Redemption [Member] Advertising Advertising Expense Aggregate Intrinsic Value [Abstract] Aggregate Intrinsic Value [Abstract] Aggregate intrinsic value [Abstract] Schedule of FHLB Advances Federal Home Loan Bank, Advance, Branch of FHLBank [Table Text Block] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Minimum for Well-Capitalized Institutions Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Fair Value Estimate of Fair Value Measurement [Member] Outstanding loan commitments to directors and executive officers Loans And Leases Receivable, Outstanding Loan Commitments, Related Parties The amount of outstanding loan commitments to related parties. MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Maturing after one year but within five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Fair Value, Option, Quantitative Disclosures [Line Items] Fair Value, Option, Quantitative Disclosures [Line Items] Reclassification adjustments for losses included in earnings Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax 2029 Time Deposit Maturities, Year Four Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Interest bearing deposits - time Interest bearing deposits time 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. Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Maturing after five years but within ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Loans transferred to other real estate Other Real Estate, Acquired Additions Additions of real estate assets taken in settlement of troubled loans through surrender or foreclosure. Accumulated other comprehensive loss Accumulated other comprehensive loss for regulatory purposes Accumulated Other Comprehensive Income (Loss), Net of Tax Condensed Financial Statements, Captions [Line Items] Condensed Financial Statements, Captions [Line Items] Financial Instruments [Domain] Financial Instruments [Domain] Unrealized gains recognized in other comprehensive income on securities available for sale, net of tax OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax Maturing after ten years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Gross deferred tax liabilities Deferred Tax Liabilities, Gross Interest rate cap agreements - short-term funding liabilities Interest Rate Cap, Short Term Funding [Member] Interest Rate Cap, Short Term Funding Performance Shares Performance Shares [Member] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Incentive compensation Deferred Tax Assets, Tax Deferred Expense, Compensation And Benefits, Incentive Compensation Deferred Tax Assets, Tax Deferred Expense, Compensation And Benefits, Incentive Compensation Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Banking Regulation, Regulatory Capital Requirement, Compliance [Table] Minimum Minimum [Member] Net Interest Income After Provision for Credit Losses Interest Income (Expense), after Provision for Loan Loss Tax credit transfer agreement liability Tax Credit Transfer Agreement, Liability Tax Credit Transfer Agreement, Liability Tax credit transfer agreement , purchase amount Tax Credit Transfer Agreement, Tax Credits Purchased, Amount Tax Credit Transfer Agreement, Tax Credits Purchased, Amount Accrued interest excluded from total Accrued interest excluded from total Financing Receivable, Accrued Interest, before Allowance for Credit Loss Federal reserve bank advances Federal Reserve Bank Advances [Member] Bank owned life insurance Effective Income Tax Rate Reconciliation, Nontaxable, Bank Owned Life Insurance, Percent Effective Income Tax Rate Reconciliation, Nontaxable, Bank Owned Life Insurance, Percent Aging Analysis of Loans By Class [Abstract] Aging Analysis Of Loans By Class [Abstract] Aging analysis of loans by class [Abstract] Non-Accrual with an Allowance for Credit Loss Financing Receivable, Nonaccrual, With Allowance For Credit Loss Amount of financing receivable on nonaccrual status with allowance for credit loss. Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Company Selected Measure Name Company Selected Measure Name Fair Value Measurement Fair Value Measurement [Domain] Summary of Financial Instruments with Off-Balance Sheet Risk Schedule of Fair Value, off-Balance-Sheet Risks [Table Text Block] Sales of originated servicing rights Servicing Asset at Fair Value, Sales of Originated Servicing Rights Servicing Asset at Fair Value, Sales of Originated Servicing Rights Minimum for Adequately Capitalized Institutions Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum OTHER BORROWINGS Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Change in fair value due to price Servicing Asset at Fair Value, Changes In Fair Value Due to Price Amount of increase (decrease) in fair value of servicing assets due to changes in price. Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Collateral Held Collateral Held [Domain] Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Estimated recorded book balances and fair values [Abstract] Estimated Recorded Book Balance And Fair Value [Abstract] Estimated recorded book balance and fair value [Abstract] Stock units for deferred compensation plan for non-employee directors (in shares) Stock Units For Deferred Compensation Plan For Non Employee Directors 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. COMMITMENTS AND CONTINGENT LIABILITIES Commitments and Contingencies Disclosure [Text Block] Other Noninterest Income, Other Operating Income, Other Income classified as other excluding interest income. Direct write-downs upon sale Real Estate Owned, Valuation Allowance, Amounts Applied OPERATING SEGMENTS Segment Reporting, Policy [Policy Text Block] Call option period Debt Instrument, Call Option Period Period of maturity which the issuer can call the outstanding debt instrument for repayment or conversion to equity, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter. Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Proceeds from bank-owned life insurance death benefits Proceeds from Life Insurance Policy Restricted Cash and Investments [Abstract] Restricted Cash and Investments [Abstract] Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Unrecognized tax benefits, income tax penalties and interest Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Securities HTM, Amortized Cost Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity [Abstract] Accrued interest, fiscal year before current fiscal year Financing Receivable, Accrued Interest, Fiscal Year Before Current Fiscal Year Amount, before allowance for credit loss, of accrued interest on financing receivable originated in fiscal year prior to current fiscal year. Average Maturity (years) Derivative, Average Remaining Maturity Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Document Transition Report Document Transition Report Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Maturing after one year but within five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Underlying Securities Award Underlying Securities Amount Gains realized on sale of securities available-for-sale Debt Securities, Available-for-Sale, Realized Gain Equity Component Equity Component [Domain] Document Period End Date Document Period End Date Time deposits, denominations amount Time Deposits Denominations Amount The denominations amount of aggregate domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $250,000 or more. Debt Securities, Held-to-Maturity, Allowance for Credit Loss Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Table Text Block] Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] SUBSEQUENT EVENTS Subsequent Events, Policy [Policy Text Block] INCOME TAX Income Tax Disclosure [Text Block] Service Charges on Deposit Accounts Service Charges On Deposits [Member] Revenues are earned on depository accounts for commercial and retail customers and include fees for transaction-based, account maintenance and overdraft services. Common Class A Common Class A [Member] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Income approach Valuation, Income Approach [Member] Short-term lease cost Short-Term Lease, Cost Exercisable, weighted-average remaining contractual term Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Risks and Uncertainties [Abstract] Risks and Uncertainties [Abstract] Document Type Document Type OTHER SEGMENT DISCLOSURES Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments [Abstract] Significant Un- observable Inputs (Level 3) Significant Un- observable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Name Outstanding Recovery, Individual Name Product and Service [Axis] Product and Service [Axis] Gross charge-offs, revolving Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff Revenue from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax Variable lease cost Variable Lease, Cost 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 Proceeds from sales of loans held for sale Proceeds from Sale, Loan, Held-for-Sale Assets and Liabilities, Lessee [Abstract] Assets and Liabilities, Lessee [Abstract] Financial Instruments Subject to Mandatory Redemption, Financial Instrument Financial Instruments Subject to Mandatory Redemption, Financial Instrument [Domain] Statistical Measurement [Axis] Statistical Measurement [Axis] Number of loan production facilities Number Of Loan Production Facilities Number Of Loan Production Facilities Retail Customer, Retail [Member] Single retail external customer or group of external retail customers. Credit Score, FICO [Domain] Credit Score, FICO [Domain] Gross charge-offs, fiscal year before current Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff Collateral Dependent Loan Collateral Dependent Loan [Member] Represents collateral dependent loan. Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Intrinsic value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value Share based compensation withholding obligation Share based compensation withholding obligation Payment, Tax Withholding, Share-Based Payment Arrangement Loans not Past Due Financial Asset, 1 to 29 Days Past Due [Member] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Derivative, term of contract Derivative, Term of Contract Proceeds from Federal Home Loan Bank advances Proceeds from FHLBank Borrowings, Financing Activities Interest rate floor agreements Interest Rate Floor [Member] Noninterest Income, Other [Abstract] Noninterest Income, Other [Abstract] Other comprehensive income Other comprehensive income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Cash and due from banks Cash and Due from Banks, Fair Value Disclosure Fair value portion of banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks. Variable Income Interest Rate Variable Income Interest Rate [Member] Weighted-Average Remaining Contractual Term [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract] Under 500 FICO Score, Under 500 [Member] Under 500 credit score as defined by the external credit rating agency, Fair Isaac Corporation (FICO). Element name and standard label in FICO Score [numeric lower end] to [numeric higher end] [Member] format. Schedule of Derivative Instruments, Gain (Loss) Derivative Instruments, Gain (Loss) [Table Text Block] Total Operating Expenses Operating Expenses Quoted Prices in Active Markets for Identical Assets (Level 1) Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] AAA Standard & Poor's, AAA Rating [Member] Payments of Federal Home Loan Bank advances Payments of FHLBank Borrowings, Financing Activities Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Table] Diluted (in dollars per share) Earnings Per Share, Diluted FDIC deposit insurance Federal Deposit Insurance Corporation Premium Expense Related party deposit liabilities Related Party Deposit Liabilities Interest expense Federal Reserve Bank, Interest Expense Federal Reserve Bank, Interest Expense Total FHLB advances Federal Home Loan Bank, Advance Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward] Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward] Maturing after five years but within ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Gains and Losses Realized on Sale of Securities Available for Sale Schedule of Realized Gain (Loss) [Table Text Block] Changes in AOCIL [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Recoveries credited to the allowance Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Allowance for Credit Loss, Recovery Troubled loan modification Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Contractual Principal Financing Receivable, Held-for-Sale Consolidation Items [Domain] Consolidation Items [Domain] Derivative Liability, Statement of Financial Position [Extensible Enumeration] Derivative Liability, Statement of Financial Position [Extensible Enumeration] Securities Investments, Debt and Equity Securities [Abstract] Auditor Location Auditor Location Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] Maximum percentage of decline in net worth for one consecutive quarter Maximum Percentage Of Decline In Net Worth For One Consecutive Quarter Refers to maximum percentage of decline in net worth for one consecutive quarter. COMPREHENSIVE INCOME Comprehensive Income, Policy [Policy Text Block] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Less imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Proceeds from sales of equity securities at fair value Proceeds from Sale of Equity Securities, FV-NI 2026 Time Deposit Maturities, Year One Commitments to extend credit Commitments to Extend Credit [Member] 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Two Time Interest-Bearing Domestic Deposit, Time Deposits Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer PROPERTY AND EQUIPMENT Property, Plant and Equipment Disclosure [Text Block] Total lease payments Lessee, Operating Lease, Liability, to be Paid Tax credit transfer agreement , purchase price percentage Tax Credit Transfer Agreement, Purchase Price Percentage Tax Credit Transfer Agreement, Purchase Price Percentage Schedule of Actual Capital Amounts and Ratios Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Interchange Income Interchange Income [Member] Interchange income primarily includes debit card interchange and network revenues. Proceeds from the sale of securities held to maturity previously charged off Proceeds, Debt Securities, Held-to-Maturity, Previously Written off, Recovery Loans Total loans Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss Schedule of Fair Value, Off-balance Sheet Risks [Table] Fair Value, off-Balance-Sheet Risk [Table] SUBORDINATED DEBT AND DEBENTURES Subordinated Borrowings Disclosure [Text Block] Number of shares owned (in shares) Investment Owned, Balance, Shares Eliminations Intersegment Eliminations [Member] Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Expiration Date Trading Arrangement Expiration Date Included in results of operations - gain on sale Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) On Sale, Included In Earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) On Sale, Included In Earnings Net decrease in other borrowings Proceeds from (Repayments of) Other Debt Minimum for well-capitalized institutions, ratio Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum Components of Regulatory Capital [Abstract] Components Of Regulatory Capital [Abstract] Components of regulatory capital [Abstract] Debt securities, held-to-maturity, allowance for credit loss Balance at beginning of period Balance at end of period Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest Reserve balances held at unrelated financial institutions Reserve Balances, Maintained At Other Financial Institutions Required reserve balances held at unrelated financial institutions. Property and equipment, net Property and equipment, net Property, Plant and Equipment, Net Collateral Dependent Loans Collateral Dependent Loans, Commercial Collateral Dependent Loans [Member] Represents the collateral dependent loans. Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Entity Current Reporting Status Entity Current Reporting Status Receivables [Abstract] Receivables [Abstract] Reciprocal Total Reciprocal Deposits Total amount of reciprocal deposits . Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Collateral Held [Axis] Collateral Held [Axis] Consolidated Entities Consolidated Entities [Domain] Maturing within one year Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One U.S. statutory rate applied to income before income tax Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Ginnie Mae Ginnie Mae [Member] Refers to Mortgage loans serviced for Ginnie Mae. Financial Instrument [Axis] Financial Instrument [Axis] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] Debt securities, available-for-sale, unrealized losses, twelve months or more Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss ALLOWANCE FOR CREDIT LOSSES Financing Receivable [Policy Text Block] Number of contracts Financing Receivable, Excluding Accrued Interest, Modifications, Nonaccrual, Number Of Contracts Financing Receivable, Excluding Accrued Interest, Modifications, Nonaccrual, Number Of Contracts Shares issued on deferral basis, credited percentage of current value Shares Issued On Deferral Basis, Credited Percentage Of Current Value The credited percentage of the current value of shares issued on a deferred basis. Float rate Measurement Input, Float Rate [Member] Measurement input using float rate to determine fair value. Tax credit investments, net of amortization Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount Current Fiscal Year End Date Current Fiscal Year End Date Debt securities, available-for-sale, unrealized losses, less than twelve months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Total Deposits Deposits Number of real estate assets sold during the period Number Of Real Estate Assets Sold The number of real estate assets financed by the entity sold during the period. Loan Portfolios Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Capitalized mortgage loan servicing rights Capitalized Mortgage Loan Servicing Rights, Fair Value Disclosure Capitalized mortgage loan servicing rights, fair value disclosure. Weighted- Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Legal and professional Professional Fees Derivatives Derivative financial instruments Derivative Liability Other Other Noninterest Expense Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Domain] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Mortgage Loan Servicing, net Capitalized Mortgage Loan Servicing Rights Capitalized Mortgage Loan Servicing Rights [Member] Refers to the capitalized mortgage loan servicing rights. Loan Restructuring Modification [Axis] Loan Restructuring Modification [Axis] Proceeds from the sale of capitalized mortgage loan servicing rights Proceeds from Sale of Mortgage Servicing Rights (MSR) Debt securities, available-for-sale, unrealized losses, total Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Balance at beginning of year Balance at end of year Unrecognized Tax Benefits Antidilutive shares excluded from computation of diluted income per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Other Borrowings The carrying amount on the balance sheet date for the aggregate of borrowings owed by the reporting entity that may include Treasury Tax and Loan or other borrowings not otherwise defined in the taxonomy. Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Schedule of Held-to-Maturity Securities [Line Items] Schedule of Held-to-Maturity Securities [Line Items] Advances year one, amount Federal Home Loan Bank, Advance, Maturity, Year One Aging Analysis of Loans by Class Financing Receivable, Past Due [Table Text Block] Percent of Loans to Total Portfolio Loans Financing Receivable, Percentage Of Loans To Portfolio Loans Percentage of loans to portfolio loans. LEASES Lessee, Operating Leases [Text Block] Net Cash From Financing Activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Measure: Measure [Axis] Other Borrowings Other Borrowings [Member] Other Borrowings Provision for credit losses Financing Receivable, Credit Loss, Expense (Reversal) Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Fair Value Derivative, Fair Value, Net Tier 1 capital to average assets Banking Regulation, Tier 1 Leverage Capital [Abstract] Long-Lived Tangible Asset Long-Lived Tangible Asset [Domain] Impaired loans Loans Receivable, Measurement Input Value of input used to measure investment in loans receivable measured at fair value. Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] Schedule of Reclassifications Out of Each Component of AOCIL Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Collateral Other Than Real Estate Collateral Other Than Real Estate [Member] Collateral Other Than Real Estate Total capital to risk-weighted assets Banking Regulation, Total Capital [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Entity Tax Identification Number Entity Tax Identification Number Accrued interest, revolving Financing Receivable, Accrued Interest, Revolving Amount, before allowance for credit loss, of accrued interest on financing receivable that can be withdrawn, repaid and redrawn. Discounted cash flow Valuation Technique, Discounted Cash Flow [Member] Gross charge-offs, three years before current Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff Available-for-sale securities, without single maturity, fair value. Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type [Axis] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type [Axis] Outstanding, beginning balance (in dollars per share) Outstanding, ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price TCSB Statutory Trust I Subsidiaries Trust Five [Member] Subsidiaries trust which is controlled, directly or indirectly, by its parent. The usual condition for control is ownership of a majority (over 50%) of the outstanding voting stock. The power to control may also exist with a lesser percentage of ownership, for example, by contract, lease, agreement with other stockholders or by court decree. Mortgage loan servicing rights sold, capitalized, percentage Mortgage Loan Servicing Rights, Sold, Capitalized, Percentage Mortgage Loan Servicing Rights, Sold, Capitalized, Percentage Common stock, shares issued (in shares) Common Stock, Shares, Issued Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative Asset, Statement of Financial Position [Extensible Enumeration] Weighted average remaining lease term (years) Operating Lease, Weighted Average Remaining Lease Term U.S. agency commercial mortgage-backed Commercial Mortgage-Backed Securities [Member] Construction Loan Concentration Risk Construction Loan Concentration Risk [Member] Construction Loan Concentration Risk Allowance for credit losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets Allowance For Loan Losses And Unfunded Lending Commitments Limited At Specific Risk Weighted Assets Allowance for loan losses and allowance for unfunded lending commitments included in total risk-based capital. GOODWILL AND OTHER INTANGIBLES Goodwill and Intangible Assets Disclosure [Text Block] Loans held for sale Loans Held-For-Sale, Unrealized Gain Loss Amount of unrealized gain (loss) on loans held for sale measured at fair value with change in fair value recognized in net income. U.S. agency residential mortgage-backed Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] Entity Public Float Entity Public Float Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Cost to service Measurement Input, Cost To Service Approach [Member] Measurement input using cost to service to determine present value of future cash flows. Securities HTM charged against the allowance Securities HTM charged against the allowance Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff Unrealized gains (losses) recognized in other comprehensive income on derivative instruments Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax, Parent Difference Fair Value, Option, Aggregate Differences, Loans and Long-Term Receivables Savings and interest-bearing checking Interest Expense, NOW Accounts, Money Market Accounts, and Savings Deposits Interest on securities Interest Income, Securities, Operating, Taxable And Tax Exempt Interest Income, Securities, Operating, Taxable And Tax Exempt Segment Reporting, Reconciling Item, Corporate Nonsegment Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Modification, nonaccrual, number of loans Financing Receivable, Modifications, Nonaccrual, Number Of Contracts Financing Receivable, Modifications, Nonaccrual, Number Of Contracts Security Exchange Name Security Exchange Name Total fixed rate advances, amount Federal Home Loan Bank, Advances, Fixed Rate Proceeds from the sale of portfolio loans Proceeds from sale of loans held-for-investment Proceeds from Sale, Loan, Held-for-Investment Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Variable Rate Contract Disclosure Off-Balance Sheet Risks Amount On Variable Rate Contract Disclosure Off-Balance Sheet Risks Amount On Variable Rate Additions (deductions) Additions (Deductions) [Abstract] Additions (deductions) [Abstract] Stock repurchased during period (in shares) Stock Repurchased During Period, Shares OPERATING EXPENSES Operating Expenses [Abstract] Residential Real Estate Loan Concentration Risk Residential Real Estate Loan Concentration Risk [Member] Residential Real Estate Loan Concentration Risk Tax credit transfer agreement, income taxes receivable Tax Credit Transfer Agreement, Income Taxes Receivable Tax Credit Transfer Agreement, Income Taxes Receivable Included in results of operations Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Summary of Credit Scores by Loan Class [Abstract] Credit Scores by Loan Class [Abstract] Credit Scores by Loan Class [Abstract] Statement [Line Items] Statement [Line Items] Foreclosed residential real estate Foreclosed Residential Real Estate Amount of residential real estate included in foreclosed assets. Accrued interest, current fiscal year Financing Receivable, Accrued Interest, Current Fiscal Year Amount, before allowance for credit loss, of accrued interest on financing receivable originated in current fiscal year. Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and Cash Equivalents Cash and Cash Equivalents at Beginning of Year Cash and Cash Equivalents at End of Year Cash and Cash Equivalent Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Number of additional shares approved for grant (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized Deferred income tax (benefit) expense Deferred income tax expense (benefit) Increase (Decrease) in Deferred Income Taxes Common Stock Common Stock [Member] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Brokered time Interest-Bearing Domestic Deposit, Brokered Loss on sale of originated servicing rights Servicing Asset at Fair Value, Gain (Loss) on Sale of Originated Servicing Rights Servicing Asset at Fair Value, Loss on Sale of Originated Servicing Rights Weighted average shares outstanding for calculation of diluted earnings per share (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Other repossessed assets Other Repossessed Assets Prepayment rate Measurement Input, Prepayment Rate [Member] Accrued interest, two years before current fiscal year Financing Receivable, Accrued Interest, Two Years Before Current Fiscal Year Amount, before allowance for credit loss, of accrued interest on financing receivable originated two years prior to current fiscal year. ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Statistical Measurement Statistical Measurement [Domain] Subjective Allocation Unallocated Financing Receivables [Member] 2031 and thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Payment for tax credit transfer agreement Payment For Tax Credit Transfer Agreement Payment For Tax Credit Transfer Agreement Condensed Statements of Financial Condition Condensed Balance Sheet [Table Text Block] Loan commitments to directors and executive officers Loans And Leases Receivable, Loan Commitments, Related Parties The amount of loan commitments to related parties. Total securities available-for-sale, amortized cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss Credit Rated and Non-rated Securities HTM Credit Quality, Externally Credit Rated and Non-rated Securities [Member] Refers to securities monitored for credit quality through external credit ratings and non-rated securities. Fair Value, Concentration of Risk, Financial Assets, Balance Sheet Groupings [Abstract] Fair Value, Concentration of Risk, Financial Assets, Balance Sheet Groupings [Abstract] Valuation Approach and Technique Valuation Approach and Technique [Domain] Pay-fixed interest rate swap agreement Interest rate swap agreement Interest Rate Swap [Member] Tax Jurisdiction of Domicile [Extensible Enumeration] Tax Jurisdiction of Domicile [Extensible Enumeration] Average unemployment rate, term Financing Receivable, Allowance For Credit Losses, Probability Of Default Assumptions, Average Unemployment Rate, Reversion Period Financing Receivable, Allowance For Credit Losses, Probability Of Default Assumptions, Average Unemployment Rate, Reversion Period Included in other comprehensive income (loss) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) FHLB stock as a percentage of unpaid principal balance Federal Home Loan Bank Stock As Percentages Of Unpaid Principal Balance Represents minimum percentage of unpaid principal balance of residential mortgage loans that needs to be held in the form of federal home loan bank stock. Bank-owned life insurance Bank Owned Life Insurance Equity in undistributed net income of subsidiaries Income (Loss) from Equity Method Investments Reclassifications out of AOCIL [Abstract] Reclassification Adjustment, Accumulated Other Comprehensive Income [Abstract] Reclassification Adjustment, Accumulated Other Comprehensive Income [Abstract] Other than temporary impairment charge on securities available for sale Deferred Tax Assets, Other Than Temporary Impairment Charge On Securities Available For Sale Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from other than temporary impairment charge on securities available for sale. Leases [Abstract] Leases [Abstract] BB Standard & Poor's, BB Rating [Member] Lessors of Residential Real Estate Lessors of Residential Real Estate [Member] Refers to concentration of credit risk to lessor residential real estate. INTEREST BEARING DEPOSITS Interest Bearing Deposits [Policy Text Block] Disclosure of accounting policy for interest bearing deposits. Non-Accrual with no Allowance for Credit Loss Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance 800 and above FICO Score, Greater than 800 [Member] Greater than 800 credit score as defined by the external credit rating agency, Fair Isaac Corporation (FICO). Element name and standard label in FICO Score Greater Than [low end numeric value] [Member] or FICO Score Less Than [high end numeric value] [Member] formats. Share based compensation withholding obligation Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Share Based Compensation [Abstract] Share-Based Payment Arrangement, Noncash Expense [Abstract] Debt securities, available-for-sale, unrealized losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Basic (in dollars per share) Earnings Per Share, Basic Maturity term (in years) Contract Disclosure Off Balance Sheet Risks Liability on Fixed Rate, Maturity, Term Contract Disclosure Off Balance Sheet Risks Liability on Fixed Rate, Maturity, Term Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Liabilities Liabilities, Fair Value Disclosure [Abstract] Common stock reserved for issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Interchange income Interchange income Interchange Income Represents interchange fees earned on debit card transactions. Gross deferred tax assets Deferred Tax Assets, Gross Discount rate Measurement Input, Discount Rate [Member] Tax benefit realized Share-Based Payment Arrangement, Exercise of Option, Tax Benefit Purchases, issuances, settlements, maturities and calls Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) Schedule of Segment Reporting Information Schedule of Segment Reporting Information, by Segment [Table Text Block] REGULATORY MATTERS [Abstract] Regulatory Matters [Abstract] Regulatory Matters [Abstract] Other Deposit Related Income Other Deposit Related Income [Member] Transaction-based fees, which includes services such as ATM use fees, stop payment charges and ACH fees are recognized at the time the transaction is executed as that is the time we fulfill our customer's request. Account maintenance fees, which includes monthly maintenance services are earned over the course of a month representing the period over which the performance obligation is satisfied. 2030 Time Deposit Maturities, Year Five Financing Receivable, Current, Allowance for Credit Loss Financing Receivable, Current, Allowance for Credit Loss [Table Text Block] Debt securities, held-to-maturity, unrecognized gains Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain Measurement Input Type [Domain] Measurement Input Type [Domain] Debt Securities, Available-for-Sale Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Amount of total gains (losses) for the period included in earnings attributable to the change in unrealized losses relating to assets and liabilities still held at December 31 Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Analysis of Capitalized Mortgage Loan Servicing Rights Schedule Of Capitalized Mortgage Loan Servicing Rights [Table Text Block] Tabular disclosure of an analysis of capitalized mortgage loan servicing rights. Deferred compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits Loans charged against the allowance Loans charged against the allowance Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff Other Intangibles [Abstract] Other Intangible Assets [Abstract] Other Intangible Assets [Abstract] U.S. agency US Government Corporations and Agencies Securities [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Administrative and other expenses Other General and Administrative Expense Current value of shares owned Investment Owned, Balance, Shares Value The value of the number of shares held at close of period. Business Customer, Business [Member] Single external business customer or group of external customers. Disaggregation of Revenue [Abstract] Disaggregation of Revenue [Abstract] Taxable Interest Income, Securities, Operating, Taxable Gain on sale of investments Gain on Sale of Investments Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing Receivables [Table] Other comprehensive income (loss) before reclassifications OCI, before Reclassifications, Net of Tax, Attributable to Parent Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Total compensation expense recognized Share-Based Payment Arrangement, Expense Hedging Designation Hedging Designation [Domain] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Interest rate cap agreements, noncommercial Interest Rate Cap, Noncommercial [Member] Interest Rate Cap, Noncommercial Schedule of Federal Home Loan Bank Advances, by Branch of FHLB Bank [Table] Federal Home Loan Bank, Advance, Branch of FHLBank [Table] Quantitative information about Level 3 fair value measurements measured on a non recurring basis Fair Value Measurement Inputs and Valuation Techniques [Abstract] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period Total Liabilities and Shareholders’ Equity Liabilities and Equity AA Standard & Poor's, AA Rating [Member] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Interest expense, federal home loan bank and federal reserve bank advances, long-term Interest Expense, Federal Home Loan Bank and Federal Reserve Bank Advances, Long-Term Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Amounts reclassified from AOCL Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Tax benefit on net realized losses Debt Securities, Available-For-Sale, Gain (Loss), Tax Expense (Benefit) Debt Securities, Available-For-Sale, Gain (Loss), Tax Expense (Benefit) Accrued interest, more than five years before current fiscal year Financing Receivable, Accrued Interest, More Than Five Years Before Current Fiscal Year Amount, before allowance for credit loss, of accrued interest on financing receivable originated more than five years prior to current fiscal year. Accounting Policies [Abstract] Accounting Policies [Abstract] New loans and advances Loans and Leases Receivable, Related Parties, Additions Schedule of Maturity Analysis of Lease Liabilities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Unused borrowing capacity Federal Reserve Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds Amount of advances or credit lines available from the Federal Reserve Bank. Non-deductible meals, entertainment and memberships Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Amount Financing receivable, year one, originated, current fiscal year Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year Pay vs Performance Disclosure [Line Items] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type [Domain] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type [Domain] Minimum for well-capitalized institutions, ratio Banking Regulation, Tier 1 Leverage Capital Ratio, Well Capitalized, Minimum Lease liabilities Total Operating Lease, Liability Deferred loan fees Deferred Tax Liabilities Deferred Expense Deferred Loan Origination Fees Costs Amount of deferred tax liability attributable to taxable temporary differences from deferred loan origination fees and costs. 90+ and Still Accruing Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Schedule of 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] Represents the difference between the aggregate fair value and aggregate remaining contractual principal balance for loans held for sale VISA Class B-1 Common Stock VISA Class B-1 [Member] Classification of common stock representing ownership interest in a corporation. Trading Activity, by Type Trading Activity, by Type [Domain] Fixed interest rate Contract Disclosure Off Balance Sheet Risks Liability Fixed Rate Contract Disclosure Off Balance Sheet Risks Liability Fixed Rate Troubled loan modifications, non-accrual, amount Financing Receivable, Excluding Accrued Interest, Modifications, Nonaccrual, Amount Financing Receivable, Excluding Accrued Interest, Modifications, Nonaccrual, Amount Reversion period Financing Receivable, Allowance For Credit Losses, Loss Given Default Assumptions, Reversion Period Financing Receivable, Allowance For Credit Losses, Loss Given Default Assumptions, Reversion Period REGULATORY MATTERS Regulatory Capital Requirements under Banking Regulations [Text Block] Total losses realized and unrealized: Fair Value Assets Measured On Recurring Basis Gain Loss Realized And Unrealized [Abstract] Fair Value Assets Measured On Recurring Basis Gain Loss Realized And Unrealized [Abstract] Financing receivable, year three, originated, two years before current fiscal year Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount 2028 Lessee, Operating Lease, Liability, to be Paid, Year Three Gross charge-offs, five years or more before current Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff Minimum for well-capitalized institutions, ratio Banking Regulation, Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Debt securities held-to-maturity, transferred unrealized loss Debt Securities, Held-to-Maturity, Transfer, Unrealized Loss Amount of unrealized loss from transfer of investment from available-for-sale to held-to-maturity debt security measured at amortized cost. Measurement Input Type [Axis] Measurement Input Type [Axis] Net gains (losses) on assets Gain (Loss) on Disposition of Assets for Financial Service Operations [Abstract] Interest bearing deposits Interest Bearing Deposits With Banks, Fair Value Disclosure 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. Name Measure Name Maturing within one year Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Additions charged to expense Real Estate Owned, Valuation Allowance, Provision Net increase in total deposits Increase (Decrease) in Deposits Proceeds from maturities, prepayments and calls of securities available for sale Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Class of Stock [Line Items] Class of Stock [Line Items] Trust preferred Trust Preferred Securities Subject to Mandatory Redemption [Member] Loan Receivable 1 Loan Receivable 1 [Member] Loan Receivable 1 Mortgage Loans Serviced For Others [Abstract] Mortgage Loans Serviced For Others [Abstract] Mortgage Loans Serviced For Others [Abstract] Substandard Accrual (9) Substandard Accrual 9 [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. Legal Entity [Axis] Legal Entity [Axis] Total Assets Total assets Assets Manufacturing Manufacturing [Member] Refers to concentration of credit risk to manufacturing. Condensed Statements of Cash Flows Condensed Cash Flow Statement [Table Text Block] Schedule of Nonvested Restricted Stock Units Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Allowance for credit losses Deferred Tax Asset, Tax Deferred Expense, Reserve and Accrual, Financing Receivable, Allowance for Credit Loss 2026 Finite-Lived Intangible Asset, Expected Amortization, Year One 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 Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Ancillary income Measurement Input, Ancillary Income [Member] Measurement input using ancillary income to determine present value of future cash flows. INCOME TAXES Income Tax, Policy [Policy Text Block] Financing Receivable, Allowance for Credit Loss [Roll Forward] Financing Receivable, Allowance for Credit Loss [Roll Forward] Components of Deferred Tax Assets and Liabilities [Abstract] Components of Deferred Tax Assets and Liabilities [Abstract] Receivable Type [Axis] Receivable Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] Other borrowings and subordinated debt and debentures Other borrowings and subordinated debt and debentures Interest Expense, Borrowings Assets Assets, Fair Value Disclosure [Abstract] Aggregate amount of time deposits of $0.25 million or more Time Deposits, $250,000 Or More The denominations amount of aggregate domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $250,000 or more. Subordinated Borrowing [Table] Subordinated Borrowing [Table] 2027 Time Deposit Maturities, Year Two Minimum for adequately capitalized institutions, ratio Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum Credit Score, FICO [Axis] Credit Score, FICO [Axis] Securities held-to-maturity, fair value Debt securities, held-to-maturity, fair value Total securities held-to-maturity, fair value Debt Securities, Held-to-Maturity, Fair Value Employee stock ownership plan dividends Effective Income Tax Rate Reconciliation, Deduction, Employee Stock Ownership Plan Dividend, Amount Cash dividends declared (in dollars per share) Cash Dividends Declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Right of use assets obtained in exchange for lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Lease, Cost [Abstract] Lease, Cost [Abstract] Financing receivable, accrued interest, four years before current fiscal year Financing Receivable, Accrued Interest, Four Years Before Current Fiscal Year Amount, before allowance for credit loss, of accrued interest on financing receivable originated four years prior to current fiscal year. Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Significant Other Observable Inputs (Level 2) Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Maturing after five years but within ten years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Mortgage loan servicing fees Mortgage Loan Servicing Fees Fees from servicing mortgage loans that have been sold. Lessee, Operating Lease, Liability, Payment, Due [Abstract] Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Commercial and industrial Residential Mortgage [Member] Schedule of Composition of Income Tax Expense Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Plan Name [Axis] Plan Name [Axis] PROPERTY AND EQUIPMENT Property, Plant and Equipment, Policy [Policy Text Block] PEO PEO [Member] Number of pending claims Loss Contingency, Pending Claims, Number Banking regulation, tier 1 leverage capital, actual Tier 1 capital Banking Regulation, Tier 1 Leverage Capital, Actual Investments Classified by Contractual Maturity Date Investments Classified by Contractual Maturity Date [Table Text Block] Income Before Income Tax and Equity in Undistributed Net Income of Subsidiaries Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income Tax Paid, by Individual Jurisdiction [Line Items] Income Tax Paid, by Individual Jurisdiction [Line Items] Communications Communication Total Non- Performing Loans Financing Receivable, Recorded Investment, Total Non Performing Loans Recorded investment in financing receivables that are past due and are not performing as per the loan agreement at the balance sheet date. Actual Common equity tier 1 capital Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Actual Common equity tier 1 capital to risk-weighted assets Banking Regulation, Common Equity Tier 1 Risk-Based Capital [Abstract] Total Time Deposits 1-4 family non-owner occupied 1-4 family non-owner occupied Family 1 4, Non-Owner Occupied [Member] Class of financing receivables related to 1-4 family non-owner occupied financing receivables. Total variable rate advances, amount Federal Home Loan Bank, Advances, Floating Rate Retained Earnings Retained Earnings [Member] Average reserve balances maintained Average Reserve Balance Required To Be Maintained Bank is required to maintain reserve balances in the form of vault cash and non-interest earning balances with the FRB. The amount refers to average reserve balances to be maintained. Schedule of Quarterly Financial Information Quarterly Financial Information [Table Text Block] Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Cash and Cash Equivalents at Beginning of Year Cash and Cash Equivalents at End of Year Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Income Statement [Abstract] Derivative financial instruments Derivative Asset Summary Of Information Regarding Subordinated Debentures [Abstract] Summary Of Information Regarding Subordinated Debentures [Abstract] Summary of information regarding subordinated debentures [Abstract] Debt securities, available-for-sale, fair value, twelve months or more Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Measured at Fair Value on a Non-recurring Basis: Fair Value, Nonrecurring [Member] Summary of Maturity of Time Deposits Time Deposit Maturities [Table Text Block] Loans Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss [Abstract] Percentage of decline in net worth during the period Percentage Of Decline In Net Worth During The Period Refers to percentage of decline in net worth during the period for profitability requirement. Service charges on deposit accounts Depositor Accounts, Fees and Commissions Includes amounts charged depositors for: (1) maintenance of their accounts (maintenance charges); (2) failure to maintain specified minimum balances on account; (3) exceeding the number of checks or transactions allowed to be processed in a given period; (4) checks drawn on no minimum balance deposit accounts; (5) withdrawals from non-transaction deposit accounts; (6) closing savings accounts before a specified minimum period of time has elapsed; (7) accounts which have remained inactive for extended periods of time or which have become dormant; (8) checks drawn against insufficient funds that the bank assesses regardless of whether it decides to pay, return or hold the check; (9) issuing stop payment orders; (10) certifying checks. This item does not include penalties assessed on the early withdrawal of time deposits. Other intangibles, net Intangible Assets, Net (Excluding Goodwill) Minimum for Adequately Capitalized Institutions Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Capital Adequacy, Minimum Product and Service Product and Service [Domain] Non-watch (1-6) Non-Watch 1-6 [Member] These loans are generally referred to as "non-watch" commercial credits that include very high or exceptional credit fundamentals through acceptable credit fundamentals. Debt Securities, Available-for-sale [Abstract] Debt Securities, Available-for-Sale [Abstract] Purchase of Federal Home Loan Bank stock Payments to Acquire Federal Home Loan Bank Stock Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Tax-exempt interest income Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount Income Tax Paid, by Individual Jurisdiction [Table] Income Tax Paid, by Individual Jurisdiction [Table] Revolving Loans Amortized Cost Basis Financing Receivable, Excluding Accrued Interest, Revolving Loan Revenue Recognition [Abstract] Loan Revenue Recognition [Abstract] Loan Revenue Recognition [Abstract] City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Subordinated debentures Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust CASH FLOW USED IN INVESTING ACTIVITIES CASH FLOW USED IN INVESTING ACTIVITIES Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] A Standard & Poor's, A Rating [Member] Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Defined contribution plan, employer matching contribution, percent of match Defined Contribution Plan, Employer Matching Contribution, Percent of Match Fair value hedge designation Fair Value Hedging [Member] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Bank Owned Life Insurance [Abstract] Bank Owned Life Insurances [Abstract] Bank Owned Life Insurances [Abstract] Total Lease, Cost Average borrowings Federal Reserve Bank, Average Borrowings Refers to the average borrowings amount during the period from the Federal Reserve Bank. Cash Flow Hedge Designation Cash Flow Hedging [Member] Accrued expenses and other liabilities Accrued expenses and other liabilities Other Liabilities Goodwill Goodwill Schedule of Lease, Cost Lease, Cost [Table Text Block] Collateral dependent loans, carrying amount Collateral Dependent Loans, Carrying Amount Loans which are measured for impairment using the fair value of collaterals. Mortgage loan servicing rights sold, capitalized amount Mortgage Loan Servicing Rights, Sold, Capitalized Amount Mortgage Loan Servicing Rights, Sold, Capitalized Amount Past due period for modified loans Past Due Period For Modified Loans The period when loan payment is considered to be in default, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter. Consolidated Consolidated Entities [Member] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Unrecognized Tax Benefits [Roll Forward] Mortgage loan servicing rights sold Mortgage Loan Servicing Rights, Sold, Amount Mortgage Loan Servicing Rights, Sold, Amount Other Other Installment Other [Member] Class of financing receivables related to other installment financing receivables. Auditor Name Auditor Name Share-based compensation Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Amount Accretion of discount on subordinated debt and debentures Accretion Expense Concentration Risk [Table] Concentration Risk [Table] Total securities available-for-sale, fair value Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value Equipment Equipment [Member] Maturity of interest bearing deposits - time Proceeds from (Payments for) in Interest-Bearing Deposits in Banks Cash paid during the year for Supplemental Cash Flow Information [Abstract] Other Performance Measure, Amount Other Performance Measure, Amount Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Data processing Data Processing The amount of expenses incurred in the period for data processing services and related costs. SECURITIES Marketable Securities, Policy [Policy Text Block] Common Stock, Class B-1 Common Stock, Class B-1 [Member] Classification of common stock representing ownership interest in a corporation. Other real estate and repossessed assets, net Repossessed Assets Amount Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Real Estate Real Estate [Member] Net Increase (Decrease) in Cash and Cash Equivalents Net Increase (Decrease) in Cash and Cash Equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Excluding Exchange Rate Effect, Including Discontinued Operation Derivative Instrument [Axis] Derivative Instrument [Axis] FAIR VALUE OF FINANCIAL INSTRUMENTS Fair Value of Financial Instruments, Policy [Policy Text Block] Liabilities Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Earnings Per Share Reconciliation [Abstract] Earnings Per Share Reconciliation [Abstract] Deferred loan costs Financing Receivable, Unamortized Loan Cost (Fee) and Purchase Premium (Discount) Exchange offer, conversion ratio, non-affiliated holder (in shares) Exchange Offer, Conversion Ratio, Non-Affiliated Holder Exchange Offer, Conversion Ratio, Non-Affiliated Holder Entity Entity [Domain] Investment in subsidiaries Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Net Cash Used In Investing Activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Schedule of Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Axis] Schedule of Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Axis] Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Employee stock ownership plan contributions Employee Stock Ownership Plan Contributions This item represents the percentage of contributions during the period made by the entity to the Employee Stock Ownership Plan (ESOP). Interest Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Lease right of use asset Operating Lease, Right-of-Use Asset Income tax expense Effective Income Tax Rate Reconciliation, Percent Operating lease cost Operating Lease, Cost Health care and life insurance expense Employee Compensation Benefit Health Care And Life Insurance Expense Expenditures for employee health care and life insurance benefits as provided for compensation. Fair Values Of Financial Instruments [Abstract] Fair Values Of Financial Instruments Recorded Book Balance Reported Value Measurement [Member] Plan Name Plan Name [Domain] Summary Information Regarding Subordinated Debentures Schedule of Subordinated Borrowing [Table Text Block] Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Real Estate [Abstract] Real Estate [Abstract] Securities HTM, Fair Value Debt Securities, Held-to-Maturity, Fair Value, Maturity [Abstract] Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Mortgage and Installment Residential Mortgage And Installment Portfolio Segment [Member] Residential Mortgage And Installment Portfolio Segment Other Other Collateral Loan [Member] Other loan represents as other collateral loan. Debt securities, held-to-maturity, accrued interest, after allowance for credit loss Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss Buildings Building [Member] DERIVATIVE FINANCIAL INSTRUMENTS Derivatives, Policy [Policy Text Block] SEGMENT REPORTING Segment Reporting Disclosure [Text Block] Net loss on sale of capitalized mortgage loan servicing rights Gain (Loss) On Sale Of Capitalized Mortgage Loan Servicing Rights Gain (Loss) On Sale Of Capitalized Mortgage Loan Servicing Rights Government guaranteed loans excluded from non-performing loans Financing Receivable, Government Guaranteed Loans Amount of financing receivables guaranteed by US Government Authorities. 600-649 FICO Score, 600 to 649 [Member] From 600 to 649 credit score as defined by the external credit rating agency, Fair Isaac Corporation (FICO). Element name and standard label in FICO Score [numeric lower end] to [numeric higher end] [Member] format. Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] No hedge designation Not Designated as Hedging Instrument [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Fixed coupon rate percentage, period Debt Instrument, Interest Rate, Stated Percentage, Period Period of contractual interest rate for funds borrowed, under the debt agreement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter. Unrealized gains (losses) recognized in other comprehensive income on derivative instruments, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Loans sold and serviced that have had servicing rights capitalized Mortgage Loans On Real Estate Serviced The carrying amount of mortgage loans on real estate that were being serviced for others at period end. ACCUMULATED OTHER COMPREHENSIVE LOSS Comprehensive Income (Loss) Note [Text Block] Weighted Average Weighted Average [Member] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Residential Adjustable Rate Mortgage Adjustable Rate Residential Mortgage [Member] Other Mortgage Loans Service's Principal Balances Schedule Of Other Mortgage Loans Services Principal Balances [Table Text Block] Tabular disclosure of other mortgage loans service's principal balances. Intangible amortization expense Amortization of Intangible Assets LEASES Lessee, Leases [Policy Text Block] Summary of reciprocal deposits [Abstract] Summary Of Reciprocal Deposits [Abstract] Summary of reciprocal deposits [Abstract] Repurchase of common stock Stock repurchased during period, value Stock Repurchased During Period, Value Schedule of Accumulated Other Comprehensive (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Sales comparison approach Sales Comparison Approach [Member] Represents the sales comparison approach to measure fair value. Non-performing TDR's Nonperforming Financial Instruments [Member] Lease right of use asset Deferred Tax Liability Lease Right of Use Asset Represents the amount of deferred tax liability lease right of use assets. Capitalized mortgage loan servicing rights Deferred Tax Liabilities Capitalized Mortgage Loan Servicing Rights Amount of deferred tax liability attributable to taxable temporary differences from capitalized mortgage loan servicing rights. Arrangement Duration Trading Arrangement Duration Fair value, concentration of risk, loans receivable Fair Value, Concentration of Risk, Loans Receivable Segments [Axis] Segments [Axis] FRB Federal Reserve Bank, Amount Outstanding At End Of Period Refers to the outstanding amount borrowed during the period from the Federal Reserve Bank. Available for sale and loans, pledged to secure other borrowings Assets Pledged As Collateral Assets, including available for sale securities, pledged to secure borrowings. Fair Value by Liability Class Fair Value by Liability Class [Domain] Unrealized loss on derivative financial instruments Deferred Tax Assets, Derivative Instruments Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Closing price (in dollars per share) Share Price SHARE BASED COMPENSATION AND BENEFIT PLANS Share-Based Payment Arrangement [Text Block] Accrued interest, three years before current fiscal year Financing Receivable, Accrued Interest, Three Years Before Current Fiscal Year Amount, before allowance for credit loss, of accrued interest on financing receivable originated three years prior to current fiscal year. Percentage of revenues excluded from ASC Topic 606 Percentage Of Revenue Excluded From ASU 2014-09 The percentage of the entity's revenue excluded from the scope of ASU 2014-09. Assets Assets Assets [Abstract] Loss reimbursement on sold loans reserve Deferred Tax Assets, Loss Reimbursement On Sold Loans Reserve Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from loss reimbursement on sold loans reserve. Advances year two, rate Federal Home Loan Bank, Advance, Maturity, Average Interest Rate, Year Two Unrealized gains recognized in other comprehensive income on securities available for sale OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax Underlying Security Market Price Change Underlying Security Market Price Change, Percent Balance at beginning of year Balance at end of year Loans and Leases Receivable, Related Parties Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value LOAN REVENUE RECOGNITION Revenue Recognition, Interest [Policy Text Block] FAIR VALUE DISCLOSURES Fair Value Disclosures [Text Block] Fixed Income Interest Rate Fixed Income Interest Rate [Member] Shareholders’ Equity Equity, Attributable to Parent [Abstract] Executive Officer Executive Officer [Member] Undivided profits Retained Earnings Accumulated Deficit Subsidiary The cumulative amount of the subsidiary reporting entity's undistributed earnings or deficit. Repayments Loans and Leases Receivable, Related Parties, Proceeds Summary of loans and leases receivable [Roll Forward] Loans and Leases Receivable, Related Parties [Roll Forward] Proceeds from the redemption of Federal Home Loan Bank stock Proceeds from Sale of Federal Home Loan Bank Stock Debt instrument, interest rate, stated percentage Debt Instrument, Interest Rate, Stated Percentage 30-59 days Financial Asset, 30 to 59 Days Past Due [Member] Entity Voluntary Filers Entity Voluntary Filers Qualifying trust preferred securities Qualifying Trust Preferred Securities Trust preferred securities qualifying as Tier 1 capital. Intangible Assets, Net (Excluding Goodwill) [Abstract] Intangible Assets, Net (Excluding Goodwill) [Abstract] Asset Derivatives Derivative Asset, Subject to Master Netting Arrangement, before Offset Net depreciation, amortization of intangible assets and premiums and accretion of discounts on securities and loans Depreciation, Amortization and Accretion, Net Property and Equipment [Abstract] Property, Plant and Equipment [Abstract] Entity Registrant Name Entity Registrant Name Cash flow hedge gain (loss) to be reclassified within 12 months Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Minimum for well-capitalized institutions, ratio Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum Other Real Estate [Roll Forward] Other Real Estate [Roll Forward] Reciprocal Interest Expense, Deposit Liabilities, Reciprocal Deposit Interest expense incurred on reciprocal deposit liabilities. Trading Activity [Axis] Trading Activity [Axis] Loan Receivable 2 Loan Receivable 2 [Member] Loan Receivable 2 FHLB Federal Home Loan Bank (FHLB) [Member] Refers to loans serviced for the federal home loan bank (FHLB). Debt securities, available-for-sale, unrealized loss position, number of positions Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Deposits Deposits [Abstract] Deposits [Abstract] Financial Asset, Past Due Financial Asset, Past Due [Member] 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 no stated maturity. Capitalized mortgage loan servicing rights, carried at fair value Balance at beginning of period Balance at end of year Servicing Asset at Fair Value, Amount 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 Bank owned life insurance Effective Income Tax Rate Reconciliation, Nontaxable, Bank Owned Life Insurance, Amount Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the tax effect of Bank Owned Life Insurance. Restatement Determination Date: Restatement Determination Date [Axis] Securities available for sale OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax [Abstract] Share based compensation Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] BANK OWNED LIFE INSURANCE Bank Owned Life Insurance [Policy Text Block] Disclosure of accounting policy for bank owned life insurance. Other Other [Member] Other deposit related income. Name Trading Arrangement, Individual Name Add (deduct) Add (Deduct) [Abstract] Add (deduct) [Abstract] Pay-fixed interest rate swap agreements - securities available for sale Interest Rate Swap, Noncommercial [Member] Forward based contracts in which two parties agree to swap periodic payments that are fixed at the outset of the swap contract with variable payments based on a market interest rate (index rate) over a specified period. Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings [Abstract] Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings [Abstract] Loans held for sale, carried at fair value Aggregate Fair Value Loan, Held-for-Sale, Fair Value Disclosure Trust Preferred Securities Issued Debt Instrument, Face Amount Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Range and Weighted Average Unobservable Inputs Weighted Average [Abstract] Unobservable Inputs Weighted Average [Abstract] Property and equipment Deferred Tax Assets, Property, Plant and Equipment Name Awards Close in Time to MNPI Disclosures, Individual Name Exchange offer, shares received (in shares) Exchange Offer, Shares Received Exchange Offer, Shares Received Outstanding, beginning balance (in dollars per share) Outstanding, ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Lease liabilities Deferred Tax Assets, Lease Liabilities Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from lease liabilities. Custodial deposit accounts Escrow Deposit Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Defined contribution plan, employer matching contribution, percent of employees' gross pay Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Freddie Mac Freddie Mac [Member] Refers to Mortgage loans serviced for Freddie Mac. BBB Standard & Poor's, BBB Rating [Member] Condensed Statements of Operations Condensed Income Statement [Table Text Block] Vested and expected to vest, aggregate intrinsic value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Liability Class [Axis] Liability Class [Axis] Auditor Firm ID Auditor Firm ID Segments [Domain] Segments [Domain] Number of restricted stock units issued to executive officers (in shares) Stock Units Or Restricted Shares Issued During Period Number of new stock units or restricted shares issued during the period. Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Commitments And Contingencies SECURITIES Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Fair Value Using Fair Value Hierarchy and NAV [Domain] Fixed Rate Contract Disclosure Off-Balance Sheet Risks Amount On Fixed Rate The contract value of financial standby letters of credit, which are not recognized in the financial statements (off-balance sheet). Balance Sheet Location Statement of Financial Position Location, Balance [Domain] IBC Capital Finance IV Subsidiaries Trust Three [Member] Subsidiaries trust which is controlled, directly or indirectly, by its parent. The usual condition for control is ownership of a majority (over 50%) of the outstanding voting stock. The power to control may also exist with a lesser percentage of ownership, for example, by contract, lease, agreement with other stockholders or by court decree. Unrealized Losses on Securities AFS AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] INTEREST EXPENSE Interest Expense, Operating and Nonoperating [Abstract] Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment NET INCOME PER COMMON SHARE Earnings Per Share, Policy [Policy Text Block] FEDERAL HOME LOAN BANK (‘‘FHLB’’) STOCK Federal Home Loan Bank, Advances Policy Text Block [Policy Text Block] The entire policy disclosure represents an equity interest in the Federal Home Loan Bank. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). OTHER REAL ESTATE Real Estate Owned [Text Block] VISA Class A Common Stock VISA Class A Stock [Member] Classification of common stock representing ownership interest in a corporation. Director Stock Purchase Plan Director Stock Purchase Plan [Member] Director Stock Purchase Plan Additions to valuation allowance charged to expense Other Real Estate, Acquired Valuation Adjustments Valuation adjustments made to real estate assets taken in settlement of troubled loans through surrender or foreclosure. Performance feature comparison period Performance Shares, Performance Feature Period of Comparison Performance Shares, Performance Feature Period of Comparison Balance at beginning of year Balance at end of year Real Estate Owned, Valuation Allowance Purchases of securities available for sale Payments to Acquire Debt Securities, Available-for-Sale OPERATING INCOME Operating Income (Loss) [Abstract] Preferred stock, no par value, 200,000 shares authorized; none issued or outstanding Preferred Stock, Value, Issued Asset Fair Value Fair Value, Net Asset (Liability) [Abstract] Obligations of states and political subdivisions US States and Political Subdivisions Debt Securities [Member] Accrued interest payable Interest Payable Schedule of Supplemental Balance Sheet Information Related to Operating Leases Lessee, Operating Lease, Balance Sheet Information [Table Text Block] Tabular disclosure of lessee's right of use assets and lease liabilities. Subordinated debt Subordinated Debt Restricted Stock and PSU's Restricted Stock And Performance Stock Units [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. Financing receivable, year two, originated, fiscal year before current fiscal year Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year Subordinated Debt Subordinated Debt [Member] Financial Asset, Aging [Axis] Financial Asset, Aging [Axis] All Executive Categories All Executive Categories [Member] Schedule of Deferred Tax Assets and Deferred Tax Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Other income Other Operating Income Common stock, no par value, 500,000,000 shares authorized; issued and outstanding: 20,548,893 shares at December 31, 2025 and 20,895,714 shares at December 31, 2024 Common Stock, Value, Issued Equity in undistributed net income of subsidiaries Income (Loss) from Equity Method Investments, Net of Dividends or Distributions Interest and fees on loans Interest and Fee Income, Loans and Leases Title of Individual [Axis] Title and Position [Axis] Net deferred loan fees Increase (Decrease) in Loans, Deferred Income Commitments and contingent liabilities Commitments and Contingencies Gross charge-offs, current fiscal year Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff Federal Home Loan Bank, Advances, Fixed Rate Federal Home Loan Bank, Advances, Fixed Rate [Member] Refers to federal home loan bank (FHLB) fixed interest rate advances. Summary of Other Real Estate Activity Other Real Estate, Roll Acquired Forward [Table Text Block] Tabular disclosure of the change in other real estate on properties owned taken in settlement of troubled loans through surrender or foreclosure by banks. Money market Reciprocal Money Market Deposits Amount of reciprocal money market deposits. NON-INTEREST INCOME - OTHER Other Non-Interest Income [Text Block] The entire disclosure for the components of other non-interest expense. Schedule of Other Non-Interest Income Schedule Of Other Non-Interest Income [Table Text Block] Tabular disclosure of the detailed components of other noninterest income. May include methodology, assumptions and amounts for noninterest income items. Mortgage loan servicing rights sold, percentage Mortgage Loan Servicing Rights, Sold, Percentage Mortgage Loan Servicing Rights, Sold, Percentage Mortgage loans in process of foreclosure, amount Mortgage Loans in Process of Foreclosure, Amount Concentration Risk [Line Items] Concentration Risk [Line Items] Unknown FICO Score, Unknown [Member] Unknown credit score as defined by the external credit rating agency, Fair Isaac Corporation (FICO). Element name and standard label in FICO Score [numeric lower end] to [numeric higher end] [Member] format. Deferred tax assets, net Deferred Tax Assets, Net PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Time Reciprocal Time Deposits Amount of reciprocal time deposits. Maturing after ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 R&S forecast period Financing Receivable, Allowance For Credit Losses, Probability Of Default Assumptions, Reasonable And Supportable, Forecast Period Financing Receivable, Allowance For Credit Losses, Probability Of Default Assumptions, Reasonable And Supportable, Forecast Period 1-4 family owner occupied - jumbo Family 1 4, Owner Occupied, Jumbo [Member] Class of financing receivables related to 1-4 family owner occupied jumbo financing receivables. Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Table] Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Table] Shares issues as retainer fees (in shares) Shares Issued In Place Of Retainer Fees Share issued to directors in place of quarterly cash retainer's fees during the period. 60-89 days Financial Asset, 60 to 89 Days Past Due [Member] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Hedging Designation [Axis] Hedging Designation [Axis] Other investments Other Interest and Dividend Income Borrowings Debt Instrument, Fair Value Disclosure Related party entity ownership percentage Percentage Of Voting Interest Owned By Related Party Director and officer ownership percentage exceeding a specific percentage amount. Schedule of Loans and Financing Receivables Serviced For Others [Table] Schedule Of Loans And Financing Receivables Serviced For Others [Table] Schedule itemizing specific types of notes receivable serviced for others. May include for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Federal home loan bank, advances, interest rate Federal Home Loan Bank Advances Home Equity Collateral Hair cut percentage used on qualifying mortgage and home equity loan collateral. Schedule of Unrecognized Tax Benefits Roll Forward Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Summary of Interest Expense on Deposits Summary Of Interest Expense On Deposits [Table Text Block] Tabular disclosure of interest expense on deposits. Advances, year five, amount Federal Home Loan Bank, Advance, Maturity, Year Five 650-699 FICO Score, 650 to 699 [Member] From 650 to 699 credit score as defined by the external credit rating agency, Fair Isaac Corporation (FICO). Element name and standard label in FICO Score [numeric lower end] to [numeric higher end] [Member] format. Installment Installment Portfolio Segment [Member] Portfolio segment of the company's total financing receivables related to installment financing receivables. Resort lending Resort Lending [Member] Class of financing receivables related to resort lending financing receivables. Amortized Cost of Collateral-dependent Loans by Class Amortized Cost Of Collateral-Dependent Loans By Class [Table Text Block] Tabular disclosure of amortized cost of collateral-dependent loans of different classes.. Derivative Contract Derivative Contract [Domain] Reclassification adjustment for expense recognized in earnings Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Proceeds from issuance of common stock Proceeds from issuance of common stock Proceeds from Issuance of Common Stock Other Other Miscellaneous Non-Interest Income Amount of other non-interest income which are not separately presented in any other noninterest income category. Transfers in and/or out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net Losses realized on sale of securities available-for-sale Debt Securities, Available-for-Sale, Realized Loss Maturing after ten years Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 Advances year two, amount Federal Home Loan Bank, Advance, Maturity, Year Two All Individuals All Individuals [Member] Long-term Debt, Type Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Capital expenditures Payments to Acquire Property, Plant, and Equipment Name Forgone Recovery, Individual Name Change in fair value due to pay downs Servicing Asset at Fair Value, Changes in Pay Downs Amount of increase (decrease) in fair value of servicing assets due to pay downs. Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Reclassified From AOCL Reclassification out of Accumulated Other Comprehensive Income [Member] Summary of Other Borrowings [Abstract] Summary Of Other Borrowings [Abstract] Summary of other borrowings [Abstract] Tax credit investments, net of amortization Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent Interest Rate Cap, Terminated Q2 2023 Interest Rate Cap, Terminated Q2 2023 [Member] Interest Rate Cap, Terminated Q2 2023 Non-Accrual (10-11) Non Accrual 10-11 [Member] These loans are generally referred to as "substandard - non-accrual" and "doubtful" commercial credits. This rating includes loans to borrowers with weaknesses that make collection of debt in full, on the basis of current facts, conditions and values at best questionable and at worst improbable. All of these loans are placed in non-accrual. Gross charge-offs, four years before current Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff Debt Securities, Held-to-Maturity [Table] Debt Securities, Held-to-Maturity [Table] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Schedule of Finite-Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] Proceeds from sale of held-to-maturity Proceeds from Sale of Held-to-Maturity Securities Other borrowings Total Other Borrowings QUARTERLY FINANCIAL DATA (UNAUDITED) Quarterly Financial Information [Text Block] Commercial Commercial Portfolio Segment [Member] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Purchased tax credits Effective Income Tax Rate Reconciliation, Purchased Tax Credit, Percent Effective Income Tax Rate Reconciliation, Purchased Tax Credit, Percent Variable interest rate Contract Disclosure Off Balance Sheet Risks Liability Variable Rate Refers to variable rate on standby letters of credit. Fixed Rate Residential Mortgage Fixed Rate Residential Mortgage [Member] Preferred stock, par value (in dollars per share) Preferred Stock, No Par Value Troubled loan modification, amount Financing Receivable, Excluding Accrued Interest, Modified In Period, Amount Financing Receivable, Excluding Accrued Interest, Modified In Period, Amount Troubled loan modifications to total loans, percentage Financing Receivable, Modified In Period, To Total Financing Receivables, Percentage Financing Receivable, Modified In Period, To Total Financing Receivables, Percentage Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Transaction based revenue Transaction Based Revenue [Member] Transaction-based fees, which includes services such as ATM use fees, stop payment charges and ACH fees are recognized at the time the transaction is executed as that is the time we fulfill our customer's request. Security12bTitle Title of 12(b) Security Provision for credit losses Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) Holdback amount Mortgage Loan Servicing Rights, Sale Holdback, Amount Mortgage Loan Servicing Rights, Sale Holdback, Amount Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table] Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table] Finite Lived Intangible Asset Useful Life [Abstract] Finite Lived Intangible Asset Useful Life [Abstract] Finite Lived Intangible Asset Useful Life [Abstract] Furniture, fixtures and equipment Equipment Expense Analysis Of Capitalized Mortgage Loan Servicing Rights [Roll Forward] Analysis Of Capitalized Mortgage Loan Servicing Rights [Roll Forward] Analysis of capitalized mortgage loan servicing rights [Abstract] Net income per common share Earnings Per Share [Abstract] 2030 Lessee, Operating Lease, Liability, to be Paid, Year Five ATM fees ATM Fees [Member] Transaction-based fees, which includes services such as ATM use fees. 500-549 FICO Score, 500 to 549 [Member] From 500 to 549 credit score as defined by the external credit rating agency, Fair Isaac Corporation (FICO). Element name and standard label in FICO Score [numeric lower end] to [numeric higher end] [Member] format. Quarterly Financial Information Disclosure [Abstract] Gross charge-offs, two years before current Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff Employee stock ownership plan dividends Effective Income Tax Rate Reconciliation, Deduction, Employee Stock Ownership Plan Dividend, Percent Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Loss given default forecast period Financing Receivable, Allowance For Credit Losses, Loss Given Default Assumptions, Forecast Period Financing Receivable, Allowance For Credit Losses, Loss Given Default Assumptions, Forecast Period Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Award Timing Disclosures [Line Items] Sales of other real estate Other Real Estate, Acquired Disposals Disposals of real estate assets taken in settlement of troubled loans through surrender or foreclosure. Effect of derivative financial instruments on the consolidated financial statements of operations [Abstract] Effect Of Derivative Financial Instruments On Consolidated Financial Statements Of Operations [Abstract] Effect Of Derivative Financial Instruments On Consolidated Financial Statements Of Operations [Abstract] Measurement Frequency Measurement Frequency [Domain] Federal Home Loan Banks [Abstract] Federal Home Loan Banks [Abstract] Assets and liabilities measured at fair value [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] Brokered time Interest Expense Domestic Deposit Liabilities, Brokered SHAREHOLDERS’ EQUITY AND NET INCOME PER COMMON SHARE Equity [Text Block] Overdraft fees Overdraft Fees [Member] Revenues are earned on depository accounts for commercial and retail customers and include fees for overdraft services. Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Loans outstanding, net Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss Net Income Net income Reclassifications, net of tax Net Income (Loss) Attributable to Parent Collateral Dependent Loans [Abstract] Collateral Dependent Loans [Abstract] Collateral dependent loans [Abstract] Actual, ratio Banking Regulation, Total Risk-Based Capital Ratio, Actual Schedule of Reconciliation of Income Tax Expense Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Common Stock, Class C Common Stock, Class C [Member] Common Stock, Class C Repurchase of common stock Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date RECLASSIFICATION Reclassification, Comparability Adjustment [Policy Text Block] Contract with customer, asset, after allowance for credit loss Contract with Customer, Asset, after Allowance for Credit Loss Schedule of Valuation Allowance for Other Real Estate Owned Other Real Estate Valuation Allowance Roll Forward [Table Text Block] Tabular disclosure of the change in real estate valuation allowance. Financing Receivable, Past Due [Table] Financing Receivable, Past Due [Table] Commercial real estate Residential Home Equity And Other Junior Mortgages [Member] Residential home equity and other junior mortgages. Customer [Axis] Customer [Axis] Investment and Insurance Commissions Investment And Insurance Commissions [Member] Investment and insurance commissions include fees and commissions from asset management, custody, recordkeeping, investment advisory and other services provided to our customers. Revenue is recognized on an accrual basis at the time the services are performed and are generally based on either the market value of the assets managed or the services provided. Total Operating Income Operating Income (Loss) Total FHLB advances, rate Federal Home Loan Bank, Advances, Interest Rate Derivative instruments Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax [Abstract] Retained earnings Retained Earnings (Accumulated Deficit) Mortgage Residential Portfolio Segment [Member] FHLB stock as a percentage of outstanding advances Federal Home Loan Bank Stock As Percentages Of Outstanding Advances Represents minimum percentage of unpaid principal balance of FHLB advances that needs to be held in the form of federal home loan bank stock. Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Average servicing fee Servicing Assets And Servicing Liabilities At Fair Value, Assumptions Used To Estimate Fair Value, Average Servicing Fee Rate The average servicing fee rate used to estimate the fair value of servicing assets and servicing liabilities. Number of analysts used in forecast Financing Receivable, Allowance For Credit Losses, Probability Of Default Assumptions, Number Of Analysts Used In Forecast Financing Receivable, Allowance For Credit Losses, Probability Of Default Assumptions, Number Of Analysts Used In Forecast Unrealized loss on securities HTM transferred from AFS Deferred Tax Asset, Debt Securities, Held-to-Maturity Transferred From Available-for-Sale, Unrealized Loss Deferred Tax Asset, Debt Securities, Held-to-Maturity Transferred From Available-for-Sale, Unrealized Loss Average discount rate Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate Purchases of securities held to maturity Payments to Acquire Held-to-Maturity Securities Lessors of Nonresidential Real Estate Lessors of Nonresidential Real Estate [Member] Refers to concentration of credit risk to lessor nonresidential real estate. Unrealized Gains (Losses) on Derivative Instruments Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Subsequent Event Type Subsequent Event Type [Domain] Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] Capital conservation buffer Banking Regulation, Capital Conservation Buffer, Capital Conserved, Minimum 1-4 family - 2nd lien Family 1 4, Second Lien [Member] Class of financing receivables related to 1-4 family second lien financing receivables. Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Construction and Land Development Construction and Land Development Loans [Member] Refers to concentration of credit risk to construction and land development loans. Other Deferred Tax Liabilities, Other Statement [Table] Statement [Table] Off-Balance Sheet Risks [Abstract] Off-Balance Sheet Risks [Abstract] Off-balance Sheet Risks [Abstract] RESTRICTIONS ON CASH AND DUE FROM BANKS Restricted Assets Disclosure [Text Block] Deferred expense (benefit) Deferred Income Tax Expense (Benefit) ADJUSTMENTS TO RECONCILE NET INCOME TO NET CASH FROM OPERATING ACTIVITIES ADJUSTMENTS TO RECONCILE NET INCOME TO NET CASH FROM OPERATING ACTIVITIES Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Reductions due to the statute of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations CASH FLOW FROM FINANCING ACTIVITIES CASH FLOW USED IN FINANCING ACTIVITIES Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Other Other Mortgage Loans Serviced [Member] Refers to other mortgage loans serviced. Reserve for unfunded lending commitments Deferred Tax Assets, Reserve for Unfunded Lending Commitments Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from reserve for unfunded lending commitments. Contract with customer, liability Contract with Customer, Liability Securities AFS, Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Held to maturity securities, without single maturity date, amortized cost Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, without Single Maturity Date Schedule of Reconciliation for all Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] All Adjustments to Compensation All Adjustments to Compensation [Member] Contractual Interest Rate Reduction Contractual Interest Rate Reduction [Member] Total securities held-to-maturity, fair value Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value Amendment flag Amendment Flag Tax benefit relating to compensation expense recognized Share-Based Payment Arrangement, Expense, Tax Benefit Securities AFS, Fair Value Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Debt securities, available-for-sale, accrued interest receivable Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss Schedule of Acquired Finite-Lived Intangible Assets by Major Class Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] Termination Date Trading Arrangement Termination Date Interest bearing deposits Interest-Bearing Deposits in Banks and Other Financial Institutions Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Advances, year six, amount Federal Home Loan Bank, Advance, Maturity, Year Six Federal Home Loan Bank, Advance, Maturity, Year Six 2028 Time Deposit Maturities, Year Three Allowance for credit losses Allowance for Credit Losses Balance at beginning of period Balance at end of period Allowance for Credit Losses Amount Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Maturing within one year Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One Receivable [Domain] Receivable [Domain] Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Share-based Payment Arrangement, Option, Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Unrecognized tax benefits, income tax penalties and interest accrued Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Unrecognized tax benefits that would impact effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Reconciliation of Basic and Diluted Net Income Per Common Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Director Director [Member] Dispropor- tionate Tax Effects from Securities AFS Accumulated Other Comprehensive Income Loss, Disproportionate Tax Effects From Securities Available For Sale [Member] Amount of disproportionate tax effects from securities available for sale. Exercisable, period end (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Operating Segments [Abstract] Segment Reporting [Abstract] Summary of estimated core deposit intangible amortization [Abstract] Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Capitalized mortgage loan servicing rights Servicing Asset, Unrealized Gain Loss Amount of unrealized gain (loss) on capitalized servicing rights measured at fair value with change in fair value recognized in net income. Unused borrowing capacity with FHLB Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds Proceeds from the sale of other real estate and repossessed assets Proceeds from Sale of Foreclosed Assets Debt instrument, discount Discount on TCSB Statutory Trust I Debt Instrument, Unamortized Discount Unrealized gain arising during period OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Percentage of outstanding common stock authorized to be repurchased Stock Repurchase Program, Percentage Of Shares Authorized To Be Repurchased The percentage share authorized to be repurchased under a stock repurchase plan. Consolidated Entities [Axis] Consolidated Entities [Axis] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Equity securities at fair value Net gains on equity securities at fair value Net gains on equity securities at fair value Equity Securities, FV-NI, Realized Gain (Loss) Securities HTM, number of defaulted securities Debt Securities, Held-to-Maturity, Defaulted, Number Of Securities Debt Securities, Held-to-Maturity, Defaulted, Number Of Securities Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross USE OF ESTIMATES Use of Estimates, Policy [Policy Text Block] Actual Total risk-based capital Banking Regulation, Total Capital, Actual Dividends paid Payments of Dividends Occupancy, net Occupancy, Net Schedule of Fair Value Measurements, Recurring and Nonrecurring Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Insider Trading Arrangements [Line Items] Financing receivable, originated, more than five years before current fiscal year Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year Interchange expense Interchange Expense Amount of expense related to debit card transactions. Debt securities, available-for-sale, allowance for credit loss Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest Total Liabilities Liabilities Antidilutive Securities, Name Antidilutive Securities, Name [Domain] Mortgage Loan Servicing Rights [Abstract] Mortgage Loan Servicing Rights [Abstract] Mortgage Loan Servicing Rights [Abstract] Rate-lock mortgage loan commitments Interest Rate Lock Commitments [Member] Securities available-for-sale, amortized cost Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Additions based on tax positions related to the current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Subordinated Debt [Abstract] Subordinated Debt Information [Abstract] Subordinated Debt Information [Abstract] Financial Instrument Performance Status Financial Instrument Performance Status [Domain] Savings and interest-bearing checking Deposits, Savings Deposits Issuance of common stock Stock Issued During Period, Value, New Issues Other asset backed Asset-Backed Securities [Member] Consolidation Items [Axis] Consolidation Items [Axis] Accommodation and Food Services Accommodation and Food Services [Member] Concentration of credit risk to accommodation and food services. Recreational vehicle lending Recreational Vehicle Lending [Member] Class of financing receivables related to recreational vehicle lending financing receivables. Counterparty Name [Axis] Counterparty Name [Axis] Proceeds from maturities, prepayments and calls of securities held to maturity Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities Securities held to maturity (fair value of $282,830 at December 31, 2025 and $301,860 at December 31, 2024) Carrying Value Carrying value Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code CAPITALIZED MORTGAGE LOAN SERVICING RIGHTS Capitalized Mortgage Loan Servicing Rights [Policy Text Block] Disclosure of accounting policy for capitalized mortgage loan servicing rights. Non-NEOs Non-NEOs [Member] Corporate Corporate Debt Securities [Member] Schedule of Cash Proceeds and Tax Benefit from share-Based Payment Awards Exercised Cash Proceeds Received and Tax Benefit from Share-Based Payment Awards [Table Text Block] 550-599 FICO Score, 550 to 599 [Member] From 550 to 599 credit score as defined by the external credit rating agency, Fair Isaac Corporation (FICO). Element name and standard label in FICO Score [numeric lower end] to [numeric higher end] [Member] format. UNITED STATES