Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Type of Borrower [Axis] Type of Borrower [Axis] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Qualified affordable housing investments obtained in exchange for funding commitments Consideration Received for Beneficial Interest Obtained for Transferring Financial Asset Loans held for sale Financing Receivable, Held-for-Sale Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Title of 12(b) Security Title of 12(b) Security Diluted net income per common share Net Income (Loss) Available to Common Stockholders, Diluted Carrying Amount Reported Value Measurement [Member] Summary of Description of Valuation Methodologies Used for Instruments Measured at Fair Value on a Non-Recurring Basis and Recognized in the Balance Sheets Fair Value Measurements, Nonrecurring [Table Text Block] Adjustment to Compensation, Amount Adjustment to Compensation Amount Nonaccrual Loans with no Allowance for Credit Losses Financing Receivable, Nonaccrual, No Allowance Financial Instrument [Axis] Financial Instrument [Axis] Segment Reporting [Abstract] Interest payable Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Liabilities, Interest Payable Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Liabilities, Interest Payable Summary of Estimated Future Amortization Expense Intangible Asset, Finite-Lived, and Capitalized Cost, Software to be Sold, Leased, or Marketed, Estimated Amortization Expense [Table Text Block] Number of loan segments Number Of Loan Segments Number Of Loan Segments State & Local taxes, net of Federal income tax effect Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Principal balance Financing Receivable, Reclassification to Held-for-Sale Fair Value Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] Redemptions of Federal Reserve Bank stock Proceeds from Sale of Federal Reserve Bank Stock Derivative Instrument [Axis] Derivative Instrument [Axis] Loss on transfer Financing Receivable, Transfer to Held-for-Sale, Valuation Allowance, Expense Investment securities Business Combination, Recognized Asset Acquired, Investment in Debt and Equity Securities, Current Measurement Frequency [Axis] Measurement Frequency [Axis] Net change in loans Payments for (Proceeds from) Loans Receivable Pre-tax premium on FHLB Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Federal Home Loan Bank Advances, Premium (Discount) Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Federal Home Loan Bank Advances, Premium (Discount) Subordinated notes Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Subordinated Notes Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Subordinated Notes Financial Asset Acquired with Credit Deterioration Financial Asset Acquired with Credit Deterioration [Member] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Par value of acquired PCD loans at acquisition Financing Receivable, Purchased with Credit Deterioration, Amount at Par Value Percent Effective Income Tax Rate Reconciliation, Percent [Abstract] Premises and equipment Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Doubtful Doubtful [Member] Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Interest Rate Reduction Contractual Interest Rate Reduction [Member] Percentage of the Corporation's investment securities available for sale in an unrealized loss position Percentage Of Total Investment Portfolio Fair Value Percentage of Total Investment Portfolio, Fair Value Prior, charge-offs Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff Total Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Proceeds from the sale of other real estate owned Proceeds from Sale of Other Real Estate Gross Unrealized Losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] Prior Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year Available for Sale Available-for-Sale Securities, Debt Maturities [Abstract] Common Stock, stated value (in dollars per share) Common Stock, Par or Stated Value Per Share Amount Reclassified from Accumulated Other Comprehensive Loss Reclassification out of Accumulated Other Comprehensive Income [Member] Combination Interest Rate Reduction, Term Extension & Payment Delay Interest Rate Reduction, Extended Maturity And Payment Deferral [Member] Interest Rate Reduction, Extended Maturity And Payment Deferral Other intangibles Intangible Asset, Excluding Goodwill, after Accumulated Amortization Unvested RSAs, beginning balance (in shares) Unvested RSAs, ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Summary of Modified Loans Financing Receivable, Modified [Table Text Block] Business Combination, Acquisition-Related Cost Type [Domain] Business Combination, Acquisition-Related Cost Type [Domain] Business Combination, Acquisition-Related Cost Type [Domain] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Construction Construction Loans [Member] Number of reportable segments Number of Reportable Segments Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss Comprehensive Income (Loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Securities Sold Under Repurchase Agreements Securities Sold under Agreements to Repurchase [Member] Entity Address, City or Town Entity Address, City or Town Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Federal Home Loan Bank stock Federal Home Loan Bank Stock Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Construction Construction Portfolio Segment [Member] Construction Portfolio Segment Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Receivables [Abstract] Receivables [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Tax credits recognized Investment Program, Proportional Amortization Method, Elected, Income Tax Credit Current fiscal year, charge-offs Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff Total core deposit and other intangibles Intangible Asset, Finite-Lived, after Accumulated Amortization Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Federal Home Loan Bank advances Federal Home Loan Bank Borrowings, Fair Value Disclosure Stock issued under dividend reinvestment and stock purchase plans Proceeds from Stock Plans Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Total other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] 90 Days or More Past Due Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Percent Total debt securities with a single maturity date Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value Proceeds from sale of mortgage loan Proceeds from Sale, Loan, Mortgage, Held-for-Sale Equipment Equipment Expense Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Level One Level One Bancorp, Inc. [Member] Level One Bancorp, Inc. Loans Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Loans Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Loans Net loss on mortgage loans reclassified to held for sale Gain (Loss) on Sale of Mortgage Loans Other comprehensive income (loss), net of tax Period change Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Tax exempt Interest And Fee Income Loans And Leases Tax Exempt Interest and Fee Income, Loans and Leases, Tax Exempt Combination Payment Delay & Term Extension Payment Deferral And Extended Maturity [Member] Payment Deferral And Extended Maturity Proceeds from issuance of subordinated notes, net of issuance costs Proceeds from Debt, Net of Issuance Costs Less: Allowance for credit losses - loans ACL - Loans Allowance on Collateral Dependent Loans Beginning balance Ending balance Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Document Period End Date Document Period End Date Preferred Stock, outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Preferred Stock, Shares Outstanding Debt face amount Debt Instrument, Face Amount Revolving loans converted to term Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan Gross losses Debt Securities, Available-for-Sale, Realized Loss Fair Value Derivative, Fair Value, Net [Abstract] Reclassification Out Of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Securities sold under repurchase agreements Securities sold under repurchase agreements Securities Sold under Agreements to Repurchase Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Other Effective Income Tax Rate Reconciliation, Other Adjustments, Amount % of Total Class of Financing Receivable Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage Due after five through ten years Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 5 through 10 Years, Amortized Cost NET INCOME PER COMMON SHARE Earnings Per Share [Text Block] Per Share Data: Earnings Per Share [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total Liabilities Liabilities Trading Symbol Trading Symbol Discount rate Measurement Input, Discount Rate [Member] Due after one through five years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Rolling after One through Five Years Investment securities available for sale Fair Value Total investment securities Debt Securities, Available-for-Sale, Excluding Accrued Interest Reclassification of loans from held for sale to loans Loan, Transfer from Held-for-Sale to Held-in-Portfolio Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Summary of Preliminary Valuations of the Fair Value of Assets Acquired and Liabilities Assumed Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] Company Selected Measure Name Company Selected Measure Name Included in other comprehensive income (loss) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Purchase of securities available for sale Payments to Acquire Debt Securities, Available-for-Sale Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Deposits Interest Expense, Deposits Current fiscal year Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year Non-refundable facility fee Line of Credit Facility, Commitment Fee Percentage Credit Facility [Domain] Credit Facility [Domain] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Stock and ESPP Options Stock Options And Employee Stock Purchase Plan [Member] Stock Options and Employee Stock Purchase Plan [Member] Cash Flows from Operating Activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Nonaccrual Loans Financing Receivable, Nonaccrual Net change in interest-bearing deposits Proceeds from (Payments for) in Interest-Bearing Deposits in Banks Cash Dividends Paid (in dollars per share) Cash dividends on common stock (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Financing Receivable, Troubled Debt Restructuring [Line Items] Financing Receivable, Modified [Line Items] Entities [Table] Entities [Table] Ameriana Capital Trust I Ameriana Capital Trust I [Member] Ameriana Capital Trust I [Member] Stock options vesting percentage Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Loan commitments to extend credit Commitments to Extend Credit [Member] Increase (decrease) in individually evaluated for impairment Financing Receivable, Increase (Decrease) Individually Evaluated For Credit Loss Financing Receivable, Increase (Decrease) Individually Evaluated For Credit Loss Acquisition-related professional and advisory services Business Combination, Acquisition-Related Cost, Professional And Advisory Services [Member] Business Combination, Acquisition-Related Cost, Professional And Advisory Services Effect of potentially dilutive stock options and restricted stock awards (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment GOODWILL AND OTHER INTANGIBLES Goodwill [Text Block] Other Intangible Assets Other Intangible Assets [Member] U.S. Government-sponsored mortgage-backed securities Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost Award Timing Predetermined Award Timing Predetermined [Flag] Reduction of the weighted average contractual interest rate after modification Financing Receivable, Modified During The Period, Weighted-Average Interest Rate After Modification Financing Receivable, Modified During The Period, Weighted-Average Interest Rate After Modification INTEREST INCOME Interest and Dividend Income, Operating [Abstract] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Amount Due after ten years Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value Income tax expense and effective tax rate Effective Income Tax Rate Reconciliation, Percent Non-rated Non Rated [Member] Non Rated CECL Day 1 PSL ACL - loans Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Loan Purchased Available for sale securities Debt Securities, Available-for-sale [Abstract] Debt Securities, Available-for-Sale [Abstract] Off-Balance Sheet, Credit Loss, Liability [Roll Forward] Off-Balance-Sheet, Credit Loss, Liability [Roll Forward] Repurchases of common stock Stock Repurchased and Retired During Period, Value Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Due after five through ten years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Rolling after 5 through 10 Years Aaa Moody's, Aaa Rating [Member] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Total debt securities with a single maturity date Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost Beginning balance (in dollars per share) Ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Maximum common stock purchases through advance payroll deductions in a calendar year Employee Stock Purchase Plan Employee Contribution Amount The maximum amount allowed for advance payroll deductions in a calendar year for employee stock purchase plan. Cumulative Preferred Stock Cumulative Preferred Stock [Member] Purchase price Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] INVESTMENT SECURITIES Investment in Debt and Equity Securities and Other Trading Assets [Text Block] Outstanding balance on the line of credit Long-Term Line of Credit Cash dividends on common stock Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date 2030 Long-Term Debt, Maturity, Year Four Adoption of the CECL Cumulative Effect, Period of Adoption, Adjustment [Member] Gross Unrealized Gains Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain Cash and due from banks Cash and Cash Equivalents, Fair Value Disclosure Subordinated Debenture Subordinated Debt [Member] Exercisable, number of shares (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Net charge-offs Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Derivative [Table] Derivative [Table] Interest-bearing Interest-Bearing Deposit Liabilities Residential Real Estate Loan [Member] Deposits Deposits, Fair Value Disclosure Commercial Real Estate Commercial Real Estate [Member] Cash Flows from Investing Activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] U.S. Bank, N.A U.S. Bank, N.A Credit Agreement [Member] U.S. Bank, N.A Credit Agreement Net income Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax Interest rate swaps Interest Rate Swap [Member] Federal Home Loan Bank, Advances, Option [Domain] Federal Home Loan Bank, Advances, Option [Domain] Cash surrender value of life insurance Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Cash Surrender Value of Life Insurance Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Cash Surrender Value of Life Insurance BORROWINGS Debt Disclosure [Text Block] Taxable Interest And Fee Income Loans And Leases Taxable Interest and Fee Income, Loans and Leases, Taxable Business Combination [Table] Business Combination [Table] ACQUISITIONS Mergers, Acquisitions and Dispositions Disclosures [Text Block] Loans: Interest and Fee Income, Financing Receivable [Abstract] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Secured Debt Secured Debt [Member] Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] RSAs Restricted Stock Awards Restricted Stock Awards [Member] Restricted Stock Awards [Member] Weighted-Average Remaining Contractual Term (in Years) Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Remaining Contractual Term [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract] Individuals' loans for household and other personal expenditures Consumer Loan [Member] Interest rate on notes (as a percent) Debt Instrument, Interest Rate, Stated Percentage Cash dividends on common stock Dividends, Common Stock, Cash Total Stockholders' Equity Beginning balance Ending balance Equity, Attributable to Parent Other assets Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent Securities or Other Assets Sold under Agreements to Repurchase [Axis] Securities or Other Assets Sold under Agreements to Repurchase [Axis] ASSETS Assets [Abstract] CECL Day 1 PCD ACL - loans Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date Payment Delay Payment Deferral [Member] Issuance of common stock related to acquisitions (in shares) Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares Summary of Credit Quality of Loan Portfolio by Loan Class Financing Receivable Credit Quality Indicators [Table Text Block] Nonrecurring Fair Value, Nonrecurring [Member] Insider Trading Policies and Procedures [Line Items] Change in deferred taxes Deferred Income Tax Expense (Benefit) Other non-taxable/non-deductible items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Commercial Real Estate Commercial Real Estate Portfolio Segment [Member] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] RSAs excluded from the diluted average common share calculation (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Summary of Changes in Goodwill Goodwill [Table Text Block] US Muni BQ curve Debt Instrument, Credit Rating Entity Central Index Key Entity Central Index Key NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES Interest Income (Expense), after Provision for Loan Loss Equity [Abstract] Equity [Abstract] 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] Federal statutory income tax at 21% Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount GENERAL LITIGATION AND REGULATORY EXAMINATIONS Legal Matters and Contingencies [Text Block] Stock issued under employee benefit plans Proceeds From Issuance Of Common Stock Under Employee Benefit Plans Proceeds from Issuance of common stock under employee Benefit plans 2026 Long-Term Debt, Maturity, Remainder of Fiscal Year Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Schedule of Investments [Line Items] Schedule of Investments [Line Items] Cash dividends on preferred stock Dividends, Preferred Stock, Cash Purchase price of PCD loans at acquisition Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price Amount Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Financing Receivable, Troubled Debt Restructuring [Table] Financing Receivable, Modified [Table] Grant date fair value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value Number of Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Basis spread on variable rate (as a percent) Debt Instrument, Basis Spread on Variable Rate Loans originated for sale Payment for Origination and Purchase, Loan, Held-for-Sale Accumulated Other Comprehensive Loss Total AOCI Attributable to Parent [Member] Federal funds purchased Interest Expense, Federal Funds Purchased All Individuals All Individuals [Member] Available for Sale Securities Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Due in one year or less Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value Summary of Gross Gains and Losses on Sales and Redemptions of Available for Sale Securities Realized Gain (Loss) on Investments [Table Text Block] Unrecognized compensation expense expected recognition period Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Federal Home Loan Bank stock Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Federal Home Loan Bank Stock Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Federal Home Loan Bank Stock Less: Common stock issued Business Combination, Consideration Transferred, Equity Interest Statement [Line Items] Statement [Line Items] TOTAL ASSETS Assets Term Extension Extended Maturity [Member] Total Interest Expense Interest Expense, Operating Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Aa1 Moody's, Aa1 Rating [Member] Assets Sold under Agreements to Repurchase [Line Items] Assets Sold under Agreements to Repurchase [Line Items] Non-cash investing activities using trade date accounting Supplemental Non Cash Investing Activities Supplemental Non Cash Investing Activities Summary of Components of Share Based Compensation Awards Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Reclassification adjustment for losses included in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Schedule of Assets Sold under Agreements to Repurchase [Table] Asset Sold under Agreement to Repurchase [Table] Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax SHARE-BASED COMPENSATION Share-Based Payment Arrangement [Text Block] U.S. Government-sponsored mortgage-backed securities Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value Net change in: Increase (Decrease) in Deposits [Abstract] Other comprehensive loss before reclassifications OCI, before Reclassifications, Net of Tax, Attributable to Parent Net occupancy Occupancy, Net PEO PEO [Member] Noninterest-bearing Noninterest-Bearing Deposit Liabilities 2028 Long-Term Debt, Maturity, Year Two Total Borrowings Debt, Long-Term and Short-Term, Combined Amount Interest-bearing deposits Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Interest Bearing Deposits Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Interest Bearing Deposits Goodwill Goodwill Balance, January 1 Balance, September 30 Goodwill Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Number of Securities Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Non-Cumulative Preferred Stock Noncumulative Preferred Stock [Member] Fair value of assets acquired Fair Value of Assets Acquired Retained Earnings Retained Earnings [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common Stock, outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Summary of Estimated Fair Values of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Corporate obligations Corporate Debt Securities [Member] Diluted Net Income Available to Common Stockholders (in dollars per share) Diluted net income per common share (in dollars per share) Earnings Per Share, Diluted Aggregate Intrinsic Value Share Based Compensation Arrangement By Share Based Payment Award Options Aggregate Intrinsic Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] FDIC assessments Federal Deposit Insurance Corporation Premium Expense Held to Maturity Debt Securities, Held-to-Maturity, Fair Value, Rolling Maturity [Abstract] Provision for credit losses Provision for credit losses - loans Financing Receivable, Credit Loss, Expense (Reversal) Intangible asset amortization Intangible Asset, Finite-Lived, Amortization Expense Three years before current fiscal year Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year Basic (in dollars per share) Business Combination, Pro Forma Information, Pro Forma Earnings Per Share, Basic Fair Value Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract] Other intangibles acquired Intangible Asset, Finite-Lived, Acquired Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Other income Revenue from Contract with Customer, Excluding Assessed Tax Maturity/Call date Debt Securities, Available-for-Sale, Term Summary of Reconciliation of Beginning and Ending Balances of Recurring Fair Value Measurements Recognized in the Balance Sheets Using Significant Unobservable Level 3 Inputs Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Table Text Block] Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation Commercial and industrial loans Commercial And Industrial Loans [Member] Commercial and Industrial Loans [Member] Summary of Affordable Housing Investments Equity Method Investments [Table Text Block] Assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] U.S. Government-sponsored mortgage-backed securities Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] Change in interest payable Increase (Decrease) in Interest Payable, Net Service charges on deposit accounts Deposit Account [Member] Commercial lending relationships Financing Receivable, Allowance For Credit Loss, Writeoff, Number Of Contracts Financing Receivable, Allowance For Credit Loss, Writeoff, Number Of Contracts Notional Amount Notional Disclosures [Abstract] Due after one through five years Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost State & Local taxes, net of Federal income tax effect Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Due after one through five years Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value Excise tax on stock repurchases Share Repurchase Program, Excise Tax Summary of Contractual Maturities of Borrowings Schedule of Maturities of Long-Term Debt [Table Text Block] Other non-taxable/non-deductible items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent Increase (decrease) in past due loans Financing Receivable, Past Due, Increase (Decrease) Financing Receivable, Past Due, Increase (Decrease) Proceeds from borrowings Proceeds from Issuance of Debt Stock issued under dividend reinvestment and stock purchase plan (in shares) Stock Issued Under Dividend Reinvestment And Stock Purchase Plan In Shares Stock Issued Under Dividend Reinvestment And Stock Purchase Plan In Shares Collateral Held [Axis] Collateral Held [Axis] Foreign investment Debt Security, Government, Non-US [Member] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Revolving loans amortized cost basis Financing Receivable, Excluding Accrued Interest, Revolving Summary of Changes in Allowance for Loan Losses Financing Receivable, Allowance for Credit Loss [Table Text Block] Common Stock, issued (in shares) Common Stock, Shares, Issued Balance, beginning of period Balance, end of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Entity Information [Line Items] Entity Information [Line Items] Forward contracts related to mortgage loans to be delivered for sale Forward Contracts [Member] 12 Months or Longer Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss ACCUMULATED OTHER COMPREHENSIVE LOSS Comprehensive Income (Loss) Note [Text Block] Schedule Of Available For Sale Securities And Held To Maturity Securities [Table] Schedule Of Available For Sale Securities And Held To Maturity Securities [Table] Schedule of Available for Sale Securities and Held To Maturity Securities [Table] Due after ten years Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value Product and Service [Domain] Product and Service [Domain] NONINTEREST EXPENSE Noninterest Expense [Abstract] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Amount of Gain (Loss) Recognized into Income on Derivatives Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Card payment fees Credit Card [Member] Payment defaults Financing Receivable, Modified, Subsequent Default Termination Date Trading Arrangement Termination Date Fair Value Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value, Rolling Maturity [Abstract] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Other intangibles Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived Federal statutory income tax at 21% Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] U.S. Government-sponsored mortgage-backed securities US Government-sponsored Enterprises Debt Securities [Member] Stock option term Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Fair Value as of Grant Date Award Grant Date Fair Value Allowance on Collateral Dependent Loans Collateral Pledged [Member] Summary of Investment Securities in a Continuous Unrealized Loss Position Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Schedule of Goodwill [Table] Goodwill [Table] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Less than 12 Months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Vested and expected to vest Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Gross carrying amount Intangible Asset, Finite-Lived, before Accumulated Amortization Tax-exempt interest income Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Tax asset, deferred and receivable Business Combination, Recognized Asset Acquired, Deferred Tax Asset Loan Restructuring Modification [Axis] Loan Restructuring Modification [Axis] Total debt securities with a single maturity date Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value Vested period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Goodwill [Roll Forward] Goodwill [Roll Forward] Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived, Class [Domain] Exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted-Average Remaining Contractual Term Summary of Fair Value Measurements of Assets and Liabilities Recognized in the Balance Sheets Measured at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Award Type [Domain] Award Type [Domain] Termination value of derivatives in a net liability position Derivative, Net Liability Position, Aggregate Fair Value FAIR VALUES OF FINANCIAL INSTRUMENTS Fair Value Disclosures [Text Block] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Amortized Cost Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date [Abstract] U.S. Government-sponsored agency securities US Government Agencies Debt Securities [Member] 2027 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year One Aa2 Moody's, Aa2 Rating [Member] Summary of Allowance for Credit Losses, Off-balance Sheet Schedule of Allowance for Credit Losses, Off-balance Sheet [Table Text Block] Schedule of Allowance for Credit Losses, Off-balance Sheet Allowance for credit losses Allowance for Credit Losses Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest Other assets Other Assets 30-59 Days Past Due Financial Asset, 30 to 59 Days Past Due [Member] Legal Entity [Axis] Legal Entity [Axis] Up to 30 Days Maturity Less than 30 Days [Member] Federal Home Loan Bank stock Interest Income, Federal Home Loan Bank Stock Interest Income, Federal Home Loan Bank Stock NONINTEREST INCOME Noninterest Income [Abstract] Cash and Cash Equivalents, January 1 Cash and Cash Equivalents, September 30 Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Measurement input Impaired Loans, Measurement Input Impaired Loans, Measurement Input Summary of Reclassification Out of Accumulated Other Comprehensive Loss Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Non-NEOs Non-NEOs [Member] Financing Receivable, Allowance for Credit Loss [Roll Forward] Financing Receivable, Allowance for Credit Loss [Roll Forward] Overnight and Continuous Maturity Overnight [Member] Cash paid in acquisition Payments to Acquire Businesses, Gross Certificates of deposit and other time deposits Increase (Decrease) in Time Deposits 2028 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Two Due after ten years Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost Summary of Borrowings Schedule of Debt [Table Text Block] Demand and savings deposits Increase (Decrease) in Savings Deposits Reduction of the weighted average contractual interest rate before modification Financing Receivable, Modified During The Period, Weighted-Average Interest Rate Before Modification Financing Receivable, Modified During The Period, Weighted-Average Interest Rate Before Modification 2027 Long-Term Debt, Maturity, Year One Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Repurchase of common stock Payments for Repurchase of Common Stock Risk free rate Measurement Input, Risk Free Interest Rate [Member] Statistical Measurement [Axis] Statistical Measurement [Axis] Summary of Effect of Derivative Financial Instruments on the Income Statement Derivative Instruments, Gain (Loss) [Table Text Block] Award Type [Axis] Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Depositary Shares, each representing a 1/100th interest in a share of Non-Cumulative Perpetual Preferred Stock, Series A Depositary Shares [Member] Depositary Shares Assets Sold under Agreements to Repurchase, Type [Domain] Assets Sold under Agreements to Repurchase, Type [Domain] Retained earnings Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Securities sold under repurchase agreements Interest Expense, Securities Sold under Agreements to Repurchase Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock, $0.125 stated value per share Common Stock Common Stock [Member] Investment securities available for sale Debt Securities, Available-for-Sale Schedule of Fair Value, Off-balance Sheet Risks [Table] Fair Value, off-Balance-Sheet Risk [Table] Performing Residential Mortgage Loans Performing Residential Mortgage Loans [Member] Performing Residential Mortgage Loans Reclassification Out Of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Four years before current fiscal year, charge-offs Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff Amortization Expense Intangible Asset, Finite-Lived, after Accumulated Amortization, Estimated Amortization Expense, Fiscal Year Maturity [Abstract] Derivative Contract [Domain] Derivative Contract [Domain] Past Due Financial Asset, Past Due [Member] Net losses on sales of securities available for sale Net losses on sales of investment securities available for sale Debt Securities, Available-for-Sale, Realized Gain (Loss) TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity Stock Options Share-Based Payment Arrangement, Option [Member] Assets acquired in a business combination Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Collateral dependent loans Collateral dependent loans Collateral Dependent Loans [Member] Collateral Dependent Loans Remaining Contractual Maturity of the Agreements Secured Debt, Repurchase Agreements Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital Summary of Amortized Cost, Gross Unrealized Gains and Losses and Approximate Fair Value of Investment Securities Unrealized Gain (Loss) on Investments [Table Text Block] 2029 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Three 2026 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Remainder of Fiscal Year Name Awards Close in Time to MNPI Disclosures, Individual Name 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] Outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Tax-exempt earnings and gains on life insurance Effective Income Tax Rate Reconciliation, Tax Exempt Earnings And Gains On Life Insurance Effective Income Tax Rate Reconciliation, Tax Exempt Earnings And Gains On Life Insurance Due after one through five years Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Loans transferred to other real estate owned Real Estate Owned, Transfer to Real Estate Owned Preferred stock value Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Federal Home Loan Bank stock Investment in Federal Home Loan Bank Stock, Fair Value Disclosure Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Hedging Designation [Axis] Hedging Designation [Axis] 60-89 Days Past Due Financial Asset, 60 to 89 Days Past Due [Member] Credit Facility [Axis] Credit Facility [Axis] Collateral dependent loans Fair Value Assets, Fair Value Disclosure Summary of Collateral Pledged for Repurchase Agreements Schedule of Repurchase Agreements [Table Text Block] Name Measure Name Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Amounts of commitments Fair Value Disclosure, off-Balance-Sheet Risks, Amount, Liability Stock issued under employee benefit plans (in shares) Stock Issued During Period, Shares, Employee Benefit Plan Debt Instrument [Line Items] Debt Instrument [Line Items] Additional Paid-in Capital Additional Paid-in Capital [Member] Agricultural land, production and other loans to farmers Farming And Agriculture [Member] Farming and Agriculture [Member] Non-deductible FDIC premiums Effective Income Tax Rate Reconciliation, Nondeductible Expense, FDIC Premiums Effective Income Tax Rate Reconciliation, Nondeductible Expense, FDIC Premiums A1 Moody's, A1 Rating [Member] Summary of Financial Instruments With Off-balance Sheet Risk Schedule of Fair Value, off-Balance-Sheet Risks [Table Text Block] Interest receivable Interest Receivable Name Trading Arrangement, Individual Name Unrecognized compensation expense related to RSAs Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Subordinated notes, debentures and other borrowings Other Liabilities, Fair Value Disclosure Subordinated notes, debentures and other borrowings Interest Expense, Subordinated Notes and Debentures Company Selected Measure Amount Company Selected Measure Amount Vested and expected to vest Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Share-based compensation (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing Receivables [Table] Increase in cash surrender value of life insurance Life Insurance, Corporate or Bank Owned, Change in Value Non-PEO NEO Non-PEO NEO [Member] Total Noninterest Expense Noninterest Expense Award Timing Method Award Timing Method [Text Block] Net Change in Cash and Cash Equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Weighted-average discount by loan balance Measurement Input, Discount By Loan Balance [Member] Measurement Input, Discount By Loan Balance Included in other liabilities Derivative Liability, Notional Amount U.S. Government-sponsored mortgage-backed securities Debt Securities, Held-to-Maturity, Maturity, without Single Maturity Date, Fair Value NET INCOME Net income Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Financing Receivable, Past Due [Table] Financing Receivable, Past Due [Table] Restatement Determination Date: Restatement Determination Date [Axis] Summary of Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Business Assets and Other Business Assets and Other Collateral Held [Member] Business Assets and Other Collateral Held Exercisable, weighted-average exercise price (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Recoveries on loans Financing Receivable, Allowance for Credit Loss, Recovery Federal funds purchased Federal funds purchased Federal Funds Purchased Derivative collateral posted Collateral Already Posted, Aggregate Fair Value Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Net Income Available to Common Stockholders Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Weighted-Average Common Shares Weighted Average Number of Shares Outstanding, Diluted [Abstract] Tax effect OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax Statistical Measurement [Domain] Statistical Measurement [Domain] Document Fiscal Year Focus Document Fiscal Year Focus Integration and transaction‑related expenses Business Combination, Acquisition-Related Cost, Expense Total share-based compensation expense, net of income taxes Share-Based Payment Arrangement, Expense, after Tax Number of Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Total Deposits Deposits Common Stock, $0.125 stated value: Authorized - 100,000,000 shares Issued and outstanding - 0 and 56,951,939 shares Common Stock, Value, Issued Line of Credit Line of Credit [Member] Restatement Determination Date Restatement Determination Date Tax Jurisdiction of Domicile [Extensible Enumeration] Tax Jurisdiction of Domicile [Extensible Enumeration] Federal Home Loan Bank advances Interest Expense, Federal Home Loan Bank and Federal Reserve Bank Advances, Long-Term Due after five through ten years Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 5 through 10 Years, Fair Value Acquisition-date allowance for credit losses Allowance for credit losses - loans Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Allowance For Credit Losses - Loans Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Allowance For Credit Losses - Loans Summary of Reconciliation of Federal Statutory to Actual Tax Expense Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Other expenses Other Noninterest Expense Vested and expected to vest, weighted-average exercise price (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price First Merchant Capital Trust II First Merchant Capital Trust II [Member] First Merchant Capital Trust II [Member] Amendment Flag Amendment Flag Goodwill [Line Items] Goodwill [Line Items] Fair value Securities Continuous Unrealized Loss Position Fair Value Securities, Continuous Unrealized Loss Position, Fair Value Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Standby letters of credit Standby Letters of Credit [Member] External Credit Rating, Moody's [Domain] External Credit Rating, Moody's [Domain] Non-credit fair value discount Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Loans Held-For-Sale, Discount (Premium) Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Loans Held-For-Sale, Discount (Premium) Federal Home Loan Bank Advances Federal Home Loan Bank Advances [Member] Issuance of stock related to acquisition Stock Issued During Period, Value, Acquisitions Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province PEO Total Compensation Amount PEO Total Compensation Amount Investment Investment, Proportional Amortization Method, Elected, Amount U.S. Government-sponsored mortgage-backed securities Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date Net income available to common stockholders (in shares) Weighted Average Number of Shares Outstanding, Basic Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Net realized losses on sales of available for sale securities Noninterest income - net realized losses on sales of available for sale securities Debt Securities, Available-for-Sale, Unrealized Gain (Loss) Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Interest-bearing deposits Interest-Bearing Deposits in Banks and Other Financial Institutions Other customer fees Financial Service, Other [Member] Interest income recognized on non-accrual loans Financing Receivable, Nonaccrual, Interest Income Change in interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Total Noninterest Income Noninterest Income Corporate obligations Corporate Obligations and U.S. Government-Sponsored Mortgage Backed Securities [Member] Corporate Obligations and U.S. Government-Sponsored Mortgage Backed Securities [Member] Purchases of Federal Home Loan Bank stock Payments to Acquire Federal Home Loan Bank Stock LOANS AND ALLOWANCE FOR CREDIT LOSSES Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Net income available to common stockholders Business Acquisition, Pro Forma Net Income (Loss) Available To Common Stockholders Business Acquisition, Pro Forma Net Income (Loss) Available To Common Stockholders Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Financial Statement Preparation Basis of Accounting, Policy [Policy Text Block] Cash dividends on preferred stock Payments of Ordinary Dividends, Preferred Stock and Preference Stock Class of Stock [Axis] Class of Stock [Axis] Stock issued under dividend reinvestment and stock purchase plan Stock Issued Under Dividend Reinvestment And Stock Purchase Plan Stock Issued Under Dividend Reinvestment And Stock Purchase Plan Debt issuance costs Debt Issuance Costs, Gross Increase (decrease) in non-accrual Financing Receivable, Nonaccrual, Increase (Decrease) Financing Receivable, Nonaccrual, Increase (Decrease) NET INCOME AVAILABLE TO COMMON STOCKHOLDERS Net income available to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Debt Securities, Held-to-maturity [Table] Debt Securities, Held-to-Maturity [Table] Pre-tax discount Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Interest Bearing Deposits, Discount (Premium) Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Interest Bearing Deposits, Discount (Premium) Accumulated amortization Intangible Asset, Finite-Lived, Accumulated Amortization Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Due in one year or less Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Rolling within One Year Net loans Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss Increase (decrease) allowance for credit loss, recovery Financing Receivable, Increase (Decrease) Individually Evaluated For Credit Loss, Allowance For Credit Loss Financing Receivable, Increase (Decrease) Individually Evaluated For Credit Loss, Allowance For Credit Loss Loans charged off Financing Receivable, Allowance for Credit Loss, Writeoff Recent Accounting Changes Adopted and New Accounting Pronouncements Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Debt outstanding Debt outstanding Long-Term Debt 30-90 Days Maturity 30 to 90 Days [Member] Two years before current fiscal year Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year A2 Moody's, A2 Rating [Member] Securities sold under repurchase agreements Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure Historical cost Investment Historical Cost Investment Historical Cost Net cash provided (used) by investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Residential Residential Real Estate Residential Real Estate [Member] Security Exchange Name Security Exchange Name Amortized Cost Total Total investment securities Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss Credit Loss Status [Domain] Credit Loss Status [Domain] Net loss on mortgage loans reclassified to held for sale Gain (Loss) on Loan, Mortgage, Transferred To Held-for-Sale Gain (Loss) on Loan, Mortgage, Transferred To Held-for-Sale Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] 12 Months or Longer Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Name Outstanding Recovery, Individual Name Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] 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] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Unrecognized compensation expense related to stock options Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Amounts reclassified from accumulated other comprehensive loss Amount reclassified from accumulated other comprehensive loss Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Schedule of Investments [Table] Schedule of Investments [Table] Cash dividends on preferred stock (in dollars per share) Preferred Stock, Dividends, Per Share, Cash Paid Borrowings: Debt, Long-Term and Short-Term, Combined Amount [Abstract] Unrealized Gains (Losses) on Defined Benefit Plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Number of loans Financing Receivable, Nonaccrual, Number Of Loans Financing Receivable, Nonaccrual, Number Of Loans Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Carrying value of securities pledged as collateral Securities Pledged As Collateral Securities Pledged as Collateral Average Diluted Common Shares Outstanding (in shares) Diluted net income per common share (in shares) Weighted Average Number of Shares Outstanding, Diluted Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Loans Total Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss Underlying Security Market Price Change Underlying Security Market Price Change, Percent DERIVATIVE FINANCIAL INSTRUMENTS Derivative Instruments and Hedging Activities Disclosure [Text Block] Gross Unrealized Losses Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss Summary of Purchase Deteriorated Loans Financing Receivable, Purchased With Credit Deterioration [Table Text Block] Financing Receivable, Purchased With Credit Deterioration Derivative liabilities Derivative Liability, Subject to Master Netting Arrangement, before Offset Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] Schedule Of Available For Sale Securities And Held To Maturity Securities Provision for credit losses on unfunded commitments Day 1 allowance for credit losses - unfunded commitments Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) Financing receivable delayed amounts Financing Receivable, Modified in Period, Amount ACL - Loans increase Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Period Increase (Decrease) Intangible Asset, Goodwill and Other [Abstract] Intangible Asset, Goodwill and Other [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Included in other assets Derivative Asset, Notional Amount Proceeds from sales of loans held for sale Proceeds from Sale, Loan, Held-for-Sale Total debt securities with a single maturity date Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date Two years before current fiscal year, charge-offs Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff Collateral Held [Domain] Collateral Held [Domain] Unvested RSAs, beginning balance (in dollars per share) Unvested RSAs, 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 Subordinated Notes, Debentures and Other Borrowings Subordinated Debentures And Term Loans [Member] Subordinated Debentures and Term Loans [Member] All Executive Categories All Executive Categories [Member] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Public finance and other commercial loans Public Finance And Other Commercial Loans [Member] Public Finance and Other Commercial Loans [Member] Interest rate lock commitments Interest Rate Lock Commitments [Member] Deposits Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Liabilities, Assumed Deposits Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Liabilities, Assumed Deposits Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Reclassification of loans to held for sale Loan and Lease, Transfer from Held-in-Portfolio to Held-for-Sale Other integration-related expenditures Business Combination, Acquisition-Related Cost, Other [Member] Business Combination, Acquisition-Related Cost, Other Outside data processing fees Information Technology and Data Processing Summary of Reconciliation of Basic and Diluted Net Income Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Debt Disclosure [Abstract] Stock issued under employee benefit plans Stock Issued During Period, Value, Employee Benefit Plan SEGMENT INFORMATION Segment Reporting [Text Block] Securities available for sale Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Minimum Minimum [Member] Earnings per common share: Earnings Per Share, Pro Forma [Abstract] LIABILITIES Liabilities [Abstract] Income Statement Location [Axis] Location, Statement of Income, Balance [Axis] Amortization expense Investment Program, Proportional Amortization Method, Applied, Amortization Expense Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted-Average Remaining Contractual Term 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] Other liabilities Other Liabilities Federal Home Loan Bank advances Federal Home Loan Bank advances Advance from Federal Home Loan Bank Business Combination [Line Items] Business Combination [Line Items] Other income Noninterest Income, Other Operating Income Held to maturity securities Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] Redemptions of Federal Home Loan Bank stock Proceeds from Sale of Federal Home Loan Bank Stock Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Common Stock, authorized (in shares) Common Stock, Shares Authorized Useful life of core deposit intangibles and other intangibles Intangible Asset, Finite-Lived, Useful Life Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Class of Financing Receivable, Type of Borrower [Domain] Class of Financing Receivable, Type of Borrower [Domain] Tax-exempt earnings and gains on life insurance Effective Income Tax Rate Reconciliation, Tax Exempt Earnings And Gains On Life Insurance, Percent Effective Income Tax Rate Reconciliation, Tax Exempt Earnings And Gains On Life Insurance, Percent Gross gains Debt Securities, Available-for-Sale, Realized Gain Schedule of Held-to-maturity Securities [Line Items] Schedule of Held-to-Maturity Securities [Line Items] Due after five through ten years Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Rolling after 5 through 10 Years, Fair Value Individually evaluated for impairment Financing Receivable, Individually Evaluated for Credit Loss Exercise Price Award Exercise Price Investment securities held to maturity, net of allowance for credit losses of $245 and $245 (fair value of $1,495,477 and $1,718,287) Net Carrying Amount Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss Recurring Fair Value, Recurring [Member] Document Quarterly Report Document Quarterly Report Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] 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] Professional and other outside services Professional and Contracted Services Expense State and municipal State and municipal securities US States and Political Subdivisions Debt Securities [Member] Change in income tax receivable Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable Special Mention Special Mention [Member] Three years before current fiscal year, charge-offs Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff Proceeds from sales of securities available for sale Proceeds from Sale of Debt Securities, Available-for-Sale Interest payable Interest Payable Preferred stock, liquidation value (in dollars per share) Preferred Stock, Liquidation Preference Per Share Unamortized debt issuance costs and acquisition-related fair value adjustments Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Number of consecutive trading days Business Combination, Number Of Consecutive Trading Days Business Combination, Number Of Consecutive Trading Days Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Equity Component [Domain] Equity Component [Domain] Measurement Input Type [Domain] Measurement Input Type [Domain] Gains or losses included in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Net loans Loans Receivable, Fair Value Disclosure Proceeds from mortgage portfolio loan sale Proceeds from Sale, Loan and Lease, Held-for-Investment Adoption Date Trading Arrangement Adoption Date Investments reported at less than historical cost Investments In Debt And Equity Securities Reported At Less Than Historical Cost [Member] Investments in Debt and Equity Securities, Reported at Less than Historical Cost [Member] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Interest rate, minimum (as a percent) Federal Home Loan Bank, Advance, Branch of FHLBank, Interest Rate Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Beginning balance (in shares) Ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Investment securities held to maturity - fair value Fair Value Total investment securities Investment securities held to maturity, net of allowance for credit losses Debt Securities, Held-to-Maturity, Fair Value Other real estate owned Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Real Estate Owned Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Real Estate Owned Taxable Interest Income, Securities, Operating, Taxable Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] A3 Moody's, A3 Rating [Member] Commercial Commercial Portfolio Segment [Member] Unfunded Commitment Investment Program, Proportional Amortization Method, Elected, Commitment Financial Asset Acquired and No Credit Deterioration Financial Asset Acquired and No Credit Deterioration [Member] Repayment of borrowings Repayments of Debt Business Combination [Domain] Business Combination [Domain] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] After 2030 Finite-Lived Intangible Asset, Expected Amortization, After Year Four Finite-Lived Intangible Asset, Expected Amortization, After Year Four Financial Asset, Aging [Domain] Financial Asset, Aging [Domain] Weighted-average Weighted Average [Member] All Adjustments to Compensation All Adjustments to Compensation [Member] Core Deposits Core Deposits [Member] Business Combination [Axis] Business Combination [Axis] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Substandard Substandard [Member] Other real estate owned and foreclosure expenses Other Real Estate Owned And Foreclosure Expenses Other Real Estate Owned And Foreclosure Expenses Deposits with financial institutions Interest Income, Deposits with Financial Institutions Income Statement [Abstract] Income Statement [Abstract] STOCKHOLDERS' EQUITY Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report First Savings Subordinated Notes First Savings Subordinated Notes [Member] First Savings Subordinated Notes Tax asset, deferred and receivable Deferred Income Tax Assets, Net Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Summary of Core Deposit and Other Intangibles Intangible Asset, Finite-Lived [Table Text Block] Diluted (in dollars per share) Business Combination, Pro Forma Information, Pro Forma Earnings Per Share, Diluted Weighted-average coupon Measurement Input, Coupon Rate [Member] Measurement Input, Coupon Rate [Member] Per Share Amount Earnings Per Share, Basic And Diluted EPS [Abstract] Earnings Per Share, Basic And Diluted EPS City Area Code City Area Code Marketing Marketing Expense Name Forgone Recovery, Individual Name Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] 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] Interest payable Interest Payable Fair Value Disclosure Interest Payable Fair Value Disclosure Entity [Domain] Entity [Domain] Exchange ratio Business Combination, Exchange Ratio Business Combination, Exchange Ratio Preferred Stock, issued (in shares) Preferred Stock, Shares Issued Investment securities: Interest and Dividend Income, Securities, by Taxable Status [Abstract] Total Interest Income Interest and Dividend Income, Operating Borrowings: Borrowed Funds [Abstract] Borrowed Funds [Abstract] Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Loans > 90 Days or More Past Due and Accruing Financing Receivable, 90 Days or More Past Due, Still Accruing Federal Home Loan Bank advances Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Liabilities, Federal Home Loan Bank Advances Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Liabilities, Federal Home Loan Bank Advances Cash surrender value of life insurance Cash Surrender Value of Life Insurance 2031 and after Long-Term Debt, Maturity, After Year Four Long-Term Debt, Maturity, After Year Four Gross unrealized losses Securities Continuous Unrealized Loss Position, Accumulated Loss Securities Continuous Unrealized Loss Position, Accumulated Loss Pre-tax compensation expense Share-Based Payment Arrangement, Expense Measurement Basis [Axis] Measurement Basis [Axis] Repurchases of common stock (in shares) Stock Repurchased and Retired During Period, Shares Goodwill acquired Goodwill, Acquired During Period Stock options exercised (in shares) Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] 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 Unrealized holding gain (loss) arising during the period OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Federal funds purchased Federal Funds Purchased, Fair Value Disclosure 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 Revolving loans amortized cost basis, charge-offs Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff Series A Preferred Stock Series A Preferred Stock [Member] Unrealized Gains (Losses) on Securities Available for Sale Unrealized gains (losses) on available for sale securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Cash and due from banks Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Summary of Unobservable Inputs Used in Recurring and Nonrecurring Level 3 Fair Value Measurements Other Than Goodwill Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Current Reporting Status Entity Current Reporting Status Net cash provided (used) by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Shares withheld on equity award settlements Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation New Suboridinated Debt Fixed-to-Floating Rate Subordinated Notes Due 2036 [Member] Fixed-to-Floating Rate Subordinated Notes Due 2036 Due after ten years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years Total investment securities Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss Summary of Pro Forma Financial Information Business Combination, Pro Forma Information [Table Text Block] Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] 2029 Long-Term Debt, Maturity, Year Three Term Extension Financing Receivable, Modified, Weighted-Average Term Increase from Modification Cash Flows from Financing Activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Premises and equipment Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Financial Instruments [Domain] Financial Instruments [Domain] CECL Day 1 PCD ACL - loans Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration Four years before current fiscal year Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year Net gains on sales of loans held for sale Gain (Loss) On Sales Of Loans Held-For-Sale Gain (Loss) On Sales Of Loans Held-For-Sale Intangible Asset, Finite-Lived, Class [Axis] Intangible Asset, Finite-Lived, Class [Axis] Stock options exercised Stock Issued During Period, Value, Stock Options Exercised Underlying Securities Award Underlying Securities Amount Accrued interest on investment securities Debt Securities, Available-For-Sale And Held-To-Maturity, Accrued Interest Debt Securities, Available-For-Sale And Held-To-Maturity, Accrued Interest Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Combination Interest Rate Reduction & Term Extension Extended Maturity and Interest Rate Reduction [Member] Preferred Stock Preferred Stock [Member] Other adjustments Payment for (Proceeds from) Other Investing Activity Issuance of stock related to acquisition (in shares) Stock Issued During Period, Shares, Acquisitions Schedule of Gain (Loss) on Securities [Table] Schedule of Gain (Loss) on Securities [Table] Loan Modifications Made to Borrowers Experiencing Financial Difficulty Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount Provision for credit losses Provision for credit losses Provision for Loan, Lease, and Other Losses Home equity Home Equity Loan [Member] Balance, beginning of period Balance, end of period Off-Balance-Sheet, Credit Loss, Liability Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Less than 12 Months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Current Fiscal Year End Date Current Fiscal Year End Date Summary of Amortized Cost of Investment Securities Held to Maturity Aggregated by Credit Quality Indicator Debt Securities, Held-to-Maturity, Credit Quality Indicator [Table Text Block] Number of banking centers Number Of Banking Centers Number Of Banking Centers Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Derivative [Line Items] Derivative [Line Items] Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] Summary of Investments in Debt and Equity Securities Reported in the Financial Statements at an Amount Less Than Their Historical Cost Schedule Of Investments Cost And Fair Value [Table Text Block] Schedule Of Investments Cost And Fair Value [Table 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] Entity File Number Entity File Number Due in one year or less Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value Loans held for sale Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Loans Held-For-Sale Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Loans Held-For-Sale Share-based compensation Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Summary of Amortized Cost and Fair Value of Available for Sale Securities and Held to Maturity Securities by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Proceeds from life insurance benefits Proceeds from Life Insurance Policy Summary of Stock Option Activity Under Stock Option Plans Share-Based Payment Arrangement, Option, Activity [Table Text Block] Weighted-Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Measurement input Debt Securities, Available-for-Sale, Measurement Input Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Measure: Measure [Axis] QUALIFIED AFFORDABLE HOUSING INVESTMENTS Equity Method Investments and Joint Ventures Disclosure [Text Block] Interest receivable Interest Receivable Fair Value Disclosure Interest Receivable, Fair Value Disclosure Tax exempt Interest Income, Securities, Operating, Tax Exempt Payment of capital calls to qualified affordable housing investments Payment for Affordable Housing Program Obligation by Federal Home Loan Bank Equity Components [Axis] Equity Components [Axis] Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] Income tax paid Income Tax Paid, after Refund Received Standby letters of credit usual term Standby Letters of Credit, Term Standby Letters of Credit, Term Entity Interactive Data Current Entity Interactive Data Current Entity Small Business Entity Small Business Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Shares withheld on equity award settlements (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Sales of investment securities available for sale: Debt Securities, Available-for-Sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment [Abstract] NET INTEREST INCOME Interest Income (Expense), Operating MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Derivative hedge fees Derivative Hedging [Member] Derivative Hedging [Member] Document Type Document Type 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] Commercial Borrower Commercial Borrower [Member] Commercial real estate, owner occupied Commercial Real Estate Owner Occupied [Member] Commercial Real Estate Owner Occupied Credit Rating, Moody's [Axis] Credit Rating, Moody's [Axis] First Savings First Savings Financial Group, Inc. [Member] First Savings Financial Group, Inc. Proceeds from maturities and redemptions of: Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale [Abstract] Exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Contract termination and similar charges Business Combination, Acquisition-Related Cost, Contract Termination [Member] Business Combination, Acquisition-Related Cost, Contract Termination Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Income Before Income Taxes Income Before Income Taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest COMMITMENTS AND CONTINGENT LIABILITIES Commitments and Contingencies Average balance Short-Term Debt, Average Outstanding Amount Net tangible assets acquired Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Tangible Assets, Net Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Tangible Assets, Net Unrealized gains (losses) on securities available for sale: OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax [Abstract] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Reclassification Out Of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] 2030 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Four Gain (Loss) on Securities [Line Items] Gain (Loss) on Securities [Line Items] Accounting Standards Update and Change in Accounting Principle [Table] Accounting Standards Update and Change in Accounting Principle [Table] Fiduciary and wealth management fees Fiduciary and Trust [Member] Executive Category: Executive Category [Axis] Summary of Unvested RSAs Outstanding Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Consumer & Residential Consumer And Residential Portfolio Segment [Member] Consumer And Residential Portfolio Segment Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Net gains and fees on sales of loans Gain (Loss) on Sales of Loans, Net Acquisition‑date expected credit losses on acquired loans Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) Additional cash flow information: Supplemental Cash Flow Information [Abstract] PEO Name PEO Name Liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Net cash and cash equivalents received in acquisition Cash Acquired from Acquisition Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Interest rate after modification Financing Receivable, Modified, Weighted-Average Interest Rate after Modification Cash and due from banks Cash and Due from Banks Summary of Past Due Aging of Loan Portfolio by Loan Class Financing Receivable, Past Due [Table Text Block] Current Financial Asset, Not Past Due [Member] Income tax expense (benefit) Share-Based Payment Arrangement, Expense, Tax Benefit Credit Loss Status [Axis] Credit Loss Status [Axis] Exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Preferred stock dividends Preferred Stock Dividends, Income Statement Impact Non-deductible FDIC premiums Effective Income Tax Rate Reconciliation, Nondeductible Expense, FDIC Premiums, Percent Effective Income Tax Rate Reconciliation, Nondeductible Expense, FDIC Premiums, Percent Principal payments Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Principal Payments Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Principal Payments Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Interest receivable Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Interest Receivable Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Interest Receivable Federal Home Loan Bank, Advances, Option [Axis] Federal Home Loan Bank, Advances, Option [Axis] Earnings on bank-owned life insurance Bank Owned Life Insurance Income Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] 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] GENERAL Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Debt Instrument [Axis] Debt Instrument [Axis] Measurement Frequency [Domain] Measurement Frequency [Domain] Collateral based measurements Collateral Based Measurements [Member] Collateral Based Measurements [Member] Other liabilities Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent Share-based compensation Share-Based Payment Arrangement, Noncash Expense Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] INTEREST EXPENSE Interest Expense, Operating and Nonoperating [Abstract] Salaries and employee benefits Labor and Related Expense Percentage of average closing price to be paid by employees Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent ESPP Employee Stock [Member] Securities held to maturity Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities Summary of Fair Value of Derivative Financial Instruments and Classification on the Balance Sheet Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Basic Net Income Available to Common Stockholders (in dollars per share) Net income available to common stockholders (in dollars per share) Earnings Per Share, Basic Measurement Input Type [Axis] Measurement Input Type [Axis] Insider Trading Arrangements [Line Items] Discount to reflect current market conditions and ultimate collectability Measurement Input, Comparability Adjustment [Member] 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] Total available remaining borrowing capacity from FHLB Debt Instrument, Unused Borrowing Capacity, Amount Subordinated notes, debentures and other borrowings Subordinated notes, debentures and other borrowings Other Borrowings Fair Value Measurement [Domain] Fair Value Measurement [Domain] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Gains on life insurance benefits Gain (Loss) On Insurance Benefits Gain (Loss) On Insurance Benefits Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Fiscal year before current fiscal year, charge-offs Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff Equity Awards Adjustments Equity Awards Adjustments [Member] Interest rate before modification Financing Receivable, Modified, Weighted-Average Interest Rate before Modification Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Revolving loans converted to term, charge-offs Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff Pass Pass [Member] Commercial real estate, non-owner occupied Commercial Real Estate Non Owner Occupied [Member] Commercial Real Estate Non Owner Occupied Summary of Composition of Loan Portfolio by Loan Class Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Printing and office supplies Noninterest Expense Printing and Fulfillment Tax-exempt interest income Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent Salaries and benefits Business Combination, Acquisition-Related Cost, Salarires And Benefits [Member] Business Combination, Acquisition-Related Cost, Salarires And Benefits Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Preferred Stock, authorized (in shares) Preferred Stock, Shares Authorized Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Number of borrower relationships Financing Receivable, Number of Loans Placed on Nonaccrual Status Financing Receivable, Number of Loans Placed on Nonaccrual Status Putable Advances Federal Home Loan Bank, Advances, Putable Option [Member] Hedging Designation [Domain] Hedging Designation [Domain] Class of Stock [Domain] Class of Stock [Domain] Liabilities assumed Business Acquisition, Assets (Liabilities) Assumed During Period Business Acquisition, Assets (Liabilities) Assumed During Period Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Interest-bearing deposits Interest Bearing Deposits With Banks Fair Value Disclosure Interest Bearing Deposits with Banks, Fair Value Disclosure Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Vested and expected to vest, number of shares (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Maximum amount of outstanding agreements Short-Term Debt, Maximum Amount Outstanding During Period INCOME TAXES Income Tax Disclosure [Text Block] Other adjustments Other Noncash Income (Expense) Other real estate owned Real Estate Acquired Through Foreclosure Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Purchase price Business Combination, Consideration Transferred Entity Filer Category Entity Filer Category Total Debt Securities, Available-for-Sale, Unrealized Loss Position Due in one year or less Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost Business Combination, Acquisition-Related Cost Type [Axis] Business Combination, Acquisition-Related Cost Type [Axis] Business Combination, Acquisition-Related Cost Type Interest rate during the period Debt Instrument, Interest Rate During Period Amortized Cost Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Rolling Maturity [Abstract] Maturities in Years Ending December 31: Long-Term Debt, Fiscal Year Maturity [Abstract] Greater Than 90 Days Maturity Greater than 90 Days [Member] Financial Asset, Period Past Due [Axis] Financial Asset, Aging [Axis] Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 Not Designated as Hedging Instrument [Member] Equity Method Investments and Joint Ventures [Abstract] Schedule of Available-for-sale Securities [Table] Investments, Debt and Equity Securities [Abstract] Deposits: Deposits [Abstract] Securities sold under repurchase agreements Security Sold under Agreement to Repurchase, Subject to Master Netting Arrangement, Asset Offset Share price (in dollars per share) Business Combination, Price Per Share Total revenue (net interest income plus noninterest income) Business Combination, Pro Forma Information, Pro Forma Revenue Entity Address, Address Line One Entity Address, Address Line One ROU assets obtained in exchange for new operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 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 Income tax expense Related income tax benefit (expense) Income tax expense and effective tax rate Income Tax Expense (Benefit) Total, charge-offs Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff Accumulated Other Comprehensive Loss AOCI Attributable to Parent, Net of Tax [Roll Forward] Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Discounted cash flow Valuation Technique, Discounted Cash Flow [Member] Statement [Table] Statement [Table] Stock options exercised Cash receipts of stock options exercised Proceeds from Stock Options Exercised Fiscal year before current fiscal year Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year Summary of Non-Accrual Loans by Loan class Financing Receivable, Nonaccrual [Table Text Block] Aa3 Moody's, Aa3 Rating [Member] Derivative assets Derivative Asset, Subject to Master Netting Arrangement, before Offset Loans held for sale Loan, Held-for-Sale, Fair Value Disclosure plus premium for illiquidity (basis points) Measurement Input, Discount for Lack of Marketability [Member] Proceeds from issuance of subordinated debt Proceeds from Issuance of Subordinated Long-Term Debt Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] UNITED STATES