Financing Receivable Term Loans by Origination Year Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract] Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Time deposits, brokered Time Deposits, Brokered Time Deposits, Brokered Interest-bearing demand Interest Expense, Demand Deposit Accounts SECURITIES Debt and Equity Securities, FV-NI [Line Items] Schedule of Amortized Cost and Fair Values of Securities Available-for-Sale, with Gross Unrealized Gains and Losses Debt Securities, Available-for-Sale [Table Text Block] Proceeds from sales of bank premises held for sale Proceeds from Sale, Property, Held-for-Sale Award Timing Predetermined Award Timing Predetermined [Flag] Restricted stock Restricted Stock Fair Value Disclosure Fair value portion of assets classified as restricted stock. Entity File Number Entity File Number Surplus Additional Paid-in Capital [Member] Tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Amount Tabular List, Table Tabular List [Table Text Block] Loans, including fees: Interest and Fee Income, Loans and Leases [Abstract] Card income Card income The amount represents card income. Impact of Recent Adopted Accounting Standards and Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Schedule of Information on the Carrying Amounts and Estimated Fair Values of the Company's Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Interest rate swaps with a commercial borrower counterparty Commercial Borrower [Member] Goodwill [Line Items] Goodwill [Line Items] Subordinated Borrowings [Abstract] Other expense Other Expenses Measurement Basis [Axis] Measurement Basis [Axis] Weighted average rate Federal Home Loan Bank, Advance, Maturity, Average Interest Rate, Year One Adjustment to Compensation: Adjustment to Compensation [Axis] Fair value of securities underlying the agreements Assets Sold under Agreements to Repurchase, Market Value RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Net amortization of debt securities Net Amortization Of Debt Securities Amount of amortization expense attributable to debt securities. Reclassification adjustment for amortization of net unrealized losses on debt securities transferred to held-to-maturity OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax Held-to-Maturity Debt Securities, Held-to-Maturity, Maturity [Abstract] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Recoveries Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery Consideration paid: Business Combination, Consideration Transferred [Abstract] West Plains Investors Statutory Trust I WPI Statutory Trust I [Member] Represents the information pertaining to WPI Statutory Trust I. Due after 1 year through 5 years Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five Adjustment to Compensation, Amount Adjustment to Compensation Amount Decrease in other assets Increase (Decrease) in Other Operating Assets Basis of Consolidation Consolidation, Policy [Policy Text Block] Municipal, consumer, and other Municipal, Consumer, And Other [Member] This member stands for municipal, consumer, and other. Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Notional Amount Derivative Asset, Notional Amount Employee Stock Option Share-Based Payment Arrangement, Option [Member] Interest-bearing deposits: Interest-Bearing Deposit Liabilities, by Component [Abstract] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Grantee Status [Domain] Grantee Status [Domain] Federal income tax expense: Effective Income Tax Rate Reconciliation, Percent [Abstract] Assets Pledged Asset Pledged as Collateral without Right [Member] Intrinsic value of restricted stock units Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested Total stockholders’ equity Beginning balance Ending balance Stockholders' equity Stockholders’ equity Equity, Attributable to Parent Measurement Frequency [Axis] Measurement Frequency [Axis] Due after 5 years through 10 years Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10 Insider Trading Policies and Procedures [Line Items] Schedule of Bank Premises and Depreciation Expense Property, Plant and Equipment [Table Text Block] Common stock, authorized (in shares) Common Stock, Shares Authorized Financial assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Fair Value, Recurring Fair Value, Recurring [Member] Business and Significant Concentrations of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] To be well capitalized under prompt corrective action provisions, amount Banking Regulation, Tier 1 Leverage Capital, Well Capitalized, Minimum LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] To be well capitalized under prompt corrective action provisions, amount Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Well Capitalized, Minimum Readily determinable fair value Equity Securities, Readily Determinable Fair Value, Unrealized Gain (Loss) Amount of unrealized gain (loss) on investment in equity security with readily determinable fair value. Cover [Abstract] Cover [Abstract] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Maximum Maximum [Member] Transfers of loans to foreclosed assets Transfers from loans Real Estate Owned, Transfer to Real Estate Owned Debt securities held-to-maturity (fair value of $426,799 at 2025 and $445,186 at 2024) Amortized Cost Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss Finite-lived intangible asset, useful life (in years) Finite-Lived Intangible Asset, Useful Life Consideration transferred, equity shares issued per acquiree share (in shares) Business Combination, Consideration Transferred, Equity Interests Issued And Issuable Upon Shareholder Election, Entity Shares Issued Per Acquiree Share Business Combination, Consideration Transferred, Equity Interests Issued And Issuable Upon Shareholder Election, Entity Shares Issued Per Acquiree Share Accrued interest receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accrued Interest Receivable The amount of accrued interest receivable recognized as of the acquisition date. Total Debt Securities, Available-for-Sale, Unrealized Loss Position Intangible assets, net Beginning balance Ending balance Total Finite-Lived Intangible Assets, Net Due after 10 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Collateral amount Debt Instrument, Collateral Amount Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] To be well capitalized under prompt corrective action provisions, amount Banking Regulation, Tier 1 Risk-Based Capital, Well Capitalized, Minimum Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] SUBORDINATED NOTES Debt Instrument [Line Items] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Wealth Management Assets and Fees Wealth Management Assets and Fees, Policy [Policy Text Block] Wealth Management Assets and Fees, Policy Unfunded Lending-related Commitments and Allowance for Credit Losses - Unfunded Lending-related Commitments Off-Balance-Sheet Credit Exposure, Policy [Policy Text Block] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Retirement Benefits [Abstract] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Interest-bearing deposits in bank Interest Income, Deposits with Financial Institutions INCOME BEFORE INCOME TAX EXPENSE Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Actual, ratio (as a percent) Banking Regulation, Tier 1 Leverage Capital Ratio, Actual Debt securities: Interest and Dividend Income, Securities, by Taxable Status [Abstract] Revolving Loans Converted to Term Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Schedule of Gains (Losses) on Foreclosed Assets Schedule of Gain (Loss) on Foreclosed Assets [Table Text Block] Tabular disclosure of gain loss on sale of foreclosed assets Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Write-down of foreclosed assets Write Down of Foreclosed Assets The amount of the direct write-down of foreclosed assets. Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Net unrealized losses on debt securities Deferred Tax Asset, Debt Securities, Available-for-Sale, Unrealized Loss Total interest expense Interest expense Interest Expense, Operating Brokered Interest Expense, Domestic Deposits Letter of Credit Letter of Credit [Member] Schedule of Stock-Based Compensation Expense (Benefit) Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Transfers of Financial Assets and Participating Interests Transfers and Servicing of Financial Assets, Transfers of Financial Assets, Sales, Policy [Policy Text Block] Individually evaluated for impairment Allowance for Credit Losses Financing Receivable, Allowance for Credit Loss, Individually Evaluated Period of borrower payment performance Financing Receivable, Period Of Borrower Payment Performance Financing Receivable, Period Of Borrower Payment Performance Document Fiscal Period Focus Document Fiscal Period Focus Weighted average rate as of end of year Assets Sold under Agreements to Repurchase, Interest Rate DERIVATIVE FINANCIAL INSTRUMENTS Derivatives, Fair Value [Line Items] Award Timing Method Award Timing Method [Text Block] Litigation Case [Domain] Litigation Case [Domain] Total Nonaccrual Total Nonaccrual Financing Receivable, Excluding Accrued Interest, Nonaccrual Total Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss Award Type [Axis] Award Type [Axis] Accounting Standards Update [Axis] Accounting Standards Update [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Consolidated HBT Financial, Inc. Parent Company [Member] PROVISION FOR CREDIT LOSSES Provision for credit losses Credit Loss, Expense (Reversal) Amount of credit loss expense (reversal of expense) for financing receivable, including adjustments to allowance for purchased credit-deteriorated loans. Schedule of Acquisition Related Expenses Business Combination, Pro Forma Information [Table Text Block] Foreclosed assets Foreclosed Real Estate Expense Allowance for credit losses Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Assets, Allowance For Credit Losses On Loans Amount of allowance for credit losses on loans acquired at the acquisition date. Trading Symbol Trading Symbol Federally tax exempt Interest Income, Securities, Operating, Tax Exempt Investments in unconsolidated subsidiaries Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Investments In Unconsolidated Subsidiaries The amount of investments in unconsolidated subsidiaries recognized as of the acquisition date. Entity Address, City or Town Entity Address, City or Town Schedule of Face Value Carrying Value of Subordinated Notes Schedule of Carrying Value of Subordinated Borrowings [Table Text Block] Tabular disclosure of carrying value of subordinated borrowings. Marketable Securities [Line Items] Marketable Securities [Line Items] Internal review threshold Internal Review Threshold Represents the internal review threshold on the amount of annual due diligence needed for commercial credits. Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] GOODWILL AND OTHER INTANGIBLE ASSETS Intangible Assets Disclosure [Text Block] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Restricted stock units Restricted Stock Units (RSUs) [Member] Time deposits, at or above FDIC insurance limit Time Deposits, at or Above FDIC Insurance Limit Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Total consideration paid Total consideration paid Business Combination, Consideration Transferred CNB Bank Shares, Inc. CNB Bank Shares, Inc. [Member] CNB Bank Shares, Inc. Securities pledged, served as collateral Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged Entity Emerging Growth Company Entity Emerging Growth Company Schedule of Amortized Cost and Fair Values of Securities Held-to-Maturity, with Gross Unrealized Gains and Losses Debt Securities, Held-to-Maturity [Table Text Block] CONDENSED PARENT COMPANY ONLY FINANCIAL STATEMENTS Condensed Financial Information of Parent Company Only Disclosure [Text Block] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Allowance for credit losses on unfunded commitments Unfunded Loan Commitment [Member] Unamortized issuance costs Debt Issuance Costs, Net Net gains (losses) Derivative, Gain (Loss) on Derivative, Net Loans modified to borrowers within last 12 months Financing Receivable, Excluding Accrued Interest, Modified, Accumulated Time Interest Expense, Time Deposits Total noninterest income Noninterest Income Common stock, outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Gross Unrecognized Losses Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss NONINTEREST EXPENSE Noninterest Expense [Abstract] Cash and due from banks Cash and Due from Banks Gross losses Derivative, Loss on Derivative Legal fees and other noninterest expense Legal Fees Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Schedule of Amortization of Intangible Assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Due after 1 year through 5 years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Interest Rate Debt Instrument, Interest Rate, Effective Percentage Pledged Status [Domain] Pledged Status [Domain] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date INCOME TAX EXPENSE Income tax expense TAX BENEFIT Income Tax Expense (Benefit) Purchase of loans Payments to Acquire Loans Receivable Spread on interest rate basis Debt Instrument, Basis Spread on Variable Rate Other assets Other Assets Accrued interest receivable Accrued Interest Receivable Fair Value Disclosure Fair value portion of assets classified as accrued interest receivable. Loan collection and servicing Expense Related to Distribution or Servicing and Underwriting Fees Measurement input Servicing Asset, Measurement Input Thereafter Time Deposit Maturities, after Year Five Preferred stock, issued (in shares) Preferred Stock, Shares Issued Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Hedging Relationship [Axis] Hedging Relationship [Axis] Loan Held for Sale Loan Held For Sale [Policy Text Block] Loan Held For Sale Total bank premises and equipment Property, Plant and Equipment, Gross 30 - 89 Days Past Due 30 - 89 Days Past Due Financing Receivables 30 To 89 Days Past Due. Due in 1 year or less Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Heartland Bancorp, Inc. Capital Trust B Heartland Bancorp, Inc. Capital Trust B Represents the information pertaining to Heartland Bancorp, Inc. Capital Trust B. Purchase price Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Tier 1 Capital (to Risk Weighted Assets) Banking Regulation, Tier 1 Risk-Based Capital [Abstract] Goodwill Goodwill, Acquired During Period Net cash paid for acquisition of Town and Country Payments to Acquire Businesses, Net of Cash Acquired Buildings and improvements Building and Building Improvements [Member] Federal Income Tax Paid, Federal, after Refund Received All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Redemption price percentage Debt Instrument, Redemption Price, Percentage REGULATORY MATTERS Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Number of shares participant is entitled to receive (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other than Options, Share Right Per Unit Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other than Options, Share Right Per Unit Goodwill Deferred Tax Assets, Goodwill and Intangible Assets Federally tax exempt interest income Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent Amortization of premium on time deposits Amortization Of Premium On Time Deposits Amortization Of Premium On Time Deposits Other Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Other noninterest income Other income Noninterest Income, Other Operating Income Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Proceeds from sales Proceeds from Sale of Debt Securities, Available-for-Sale Debt securities available-for-sale, at fair value Total Debt securities available-for-sale Debt Securities, Available-for-Sale, Excluding Accrued Interest Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Subsequent Event Subsequent Event [Member] Net interest income Interest Income (Expense), Operating Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Actual, amount Banking Regulation, Tier 1 Risk-Based Capital, Actual Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Net gain on sales of bank premises held for sale Gain (Loss) on Disposition of Property Plant Equipment Held For Sale Amount of gain (loss) on sale or disposal of property, plant and equipment assets held for sale. Assets acquired: Business Combination, Recognized Asset Acquired, Asset [Abstract] Equity Components [Axis] Equity Components [Axis] FORECLOSED ASSETS Real Estate Properties [Line Items] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Year four Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year Standby letters of credit Standby Letters of Credit [Member] Initial cost Equity Securities, Without Readily Determinable Fair Value, Cost Cost of investment in equity security with no readily determinable fair value. Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Number of reportable segments Number of Reportable Segments EMPLOYEE BENEFIT PLANS Compensation and Employee Benefit Plans [Text Block] Deferred tax assets Components of Deferred Tax Assets [Abstract] Advertising Costs Advertising Cost [Policy Text Block] Entity Address, State or Province Entity Address, State or Province Substandard Substandard [Member] Total interest and dividend income Interest and Dividend Income, Operating Special Mention Special Mention [Member] Financial Asset, Aging [Domain] Financial Asset, Aging [Domain] Cash dividends and dividend equivalents Dividends, Common Stock Loans, net Loans Receivable, Fair Value Disclosure JUNIOR SUBORDINATED DEBENTURES ISSUED TO CAPITAL TRUSTS Junior Subordinated Debentures Issued Disclosure [Text Block] The entire disclosure for debentures issued to capital trusts under subordinated debt agreements. Foreclosed assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Foreclosed Assets The amount of foreclosed assets recognized as of the acquisition date. Outstanding (in dollars per share) Outstanding (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Grant Date Assigned Value Per share or unit weighted-average fair value of award under share-based payment arrangement. Individual: Individual [Axis] Contribution expense Defined Contribution Plan, Cost Income Tax Jurisdiction [Domain] Income Tax Jurisdiction [Domain] Qualifies as Tier 2 capital Qualifying as Tier Two Capital, Percentage The amount of the related value that qualifies as Tier 2 capital, as a percentage of the total value. Schedule of Stock Appreciation Rights Share-Based Payment Arrangement, Stock Appreciation Right, Activity [Table Text Block] Cash dividends and dividend equivalents paid Payments of Ordinary Dividends, Common Stock Document Annual Report Document Annual Report Purchase of interest-bearing time deposits with banks Purchase Of Interest-Bearing Time Deposits With Banks Purchase Of Interest-Bearing Time Deposits With Banks Maximum loss exposure, amount Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Nonaccrual interest Deferred Tax Assets, Non accrual Interest Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from non accrual interest. Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] For capital adequacy purposes, amount Banking Regulation, Tier 1 Risk-Based Capital, Capital Adequacy, Minimum Entity Interactive Data Current Entity Interactive Data Current Gross Charge-Offs Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Revenue from Contracts with Customers Revenue from Contract with Customer [Policy Text Block] INTEREST AND DIVIDEND INCOME Interest and Dividend Income, Operating [Abstract] Loan Servicing Transfers and Servicing of Financial Assets, Servicing of Financial Assets, Policy [Policy Text Block] Total noninterest expense Total noninterest expense Noninterest Expense Net operating loss carryforward Deferred Tax Assets, Operating Loss Carryforwards Deposits Total interest expense on deposits Interest Expense, Deposits Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] NONINTEREST INCOME Noninterest Income [Abstract] Net decrease in repurchase agreements Increase (Decrease) in Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Net Condensed Financial Statements [Table] Condensed Financial Statements [Table] Entity Central Index Key Entity Central Index Key PEO Name PEO Name Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] FAIR VALUE OF FINANCIAL INSTRUMENTS Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Schedule of Loans by Category Risk Ratings Financing Receivable Credit Quality Indicators [Table Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Mortgage loans originated for sale Payment for Origination, Loan, Mortgage, Held-for-Sale Bank owned life insurance Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Bank owned life insurance The amount of bank owned life insurance recognized as of the acquisition date. For capital adequacy purposes, amount Banking Regulation, Tier 1 Leverage Capital, Capital Adequacy, Minimum Noninterest-bearing Noninterest-bearing deposits Noninterest-Bearing Deposit Liabilities Heartland Bancorp, Inc. Capital Trust C Heartland Bancorp, Inc. Capital Trust C Represents the information pertaining to Heartland Bancorp, Inc. Capital Trust C. Consideration transferred, per share in cash (in dollars per share) Business Combination, Consideration Transferred, Equity Interests Issued And Issuable Upon Shareholder Election, Cash Paid Per Acquiree Share Business Combination, Consideration Transferred, Equity Interests Issued And Issuable Upon Shareholder Election, Cash Paid Per Acquiree Share Schedule of Interest Rate Swap Agreement Designated as a Cash Flow Hedge Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Exercise Price Award Exercise Price Federally tax exempt Interest And Fee Income Loans, Federally Tax Exempt The amount represents Interest and fee income loans, federally tax exempt. Entity Filer Category Entity Filer Category For capital adequacy purposes, ratio (as a percent) Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum Fair value adjustments attributable to payments and principal reductions Servicing Asset at Fair Value, Adjustment in Fair Value, Payments and Principal Reductions Amount of decrease from changes in fair value related to payments and principal reductions for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. Federal income tax, at US statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Subsequent Event Type [Axis] Subsequent Event Type [Axis] Foreign income tax expense Foreign Income Tax Expense (Benefit), Continuing Operations Deferred loan fees Deferred Tax Assets, Deferred Loan Fees Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred loan fees. Accrued interest payable Accrued Liabilities, Fair Value Disclosure 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Three Beginning balance Ending balance Carrying value of foreclosed asset Real Estate Acquired Through Foreclosure Reclassification adjustment for net settlements on derivative instruments Other Comprehensive Income (Loss), Cash Flow Hedge, Reclassification for Discontinuance, before Tax Restricted Stock Restricted Stock [Policy Text Block] Restricted Stock 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] Entity Address, Address Line One Entity Address, Address Line One Repayment of subordinated notes Repayments of Subordinated Debt Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Revolving Loans Converted to Term Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] DERIVATIVE FINANCIAL INSTRUMENTS Derivative Instruments and Hedging Activities Disclosure [Text Block] Dividends received from bank subsidiary Investment Income, Dividend from Bank The amount of dividend income from investments in bank subsidiaries. For capital adequacy purposes, ratio (as a percent) Common Equity Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Percentage of common equity Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. Borrowings Interest Expense on Borrowings, Other Than Securities Sold under Agreements to Repurchase and Subordinated Notes and Debentures The amount of interest expense on borrowings other than securities sold coupled with an agreement to repurchase and subordinated notes and debentures. Fair Value as of Grant Date Award Grant Date Fair Value Initial cost Equity Securities, FV-NI, Cost Undistributed earnings of consolidated subsidiaries Undistributed Earnings, Basic LOANS AND THE ALLOWANCE FOR LOAN LOSSES Financing Receivable, Impaired [Line Items] Carrying value of securities underlying the agreements Assets Sold under Agreements to Repurchase, Carrying Amount Year five Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year Stock appreciation rights plan liability recorded for the outstanding units Deferred Compensation Liability, Current and Noncurrent Construction and land development Construction And Land Development [Member] This member stands for construction and land development loans. Employee benefits Employee Benefits and Share-Based Compensation Dilutive effect of outstanding restricted stock units (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Net accretion of discount and deferred loan fees on loans Accretion Of Discount And Deferred Loan Fees On Loans The net increase (decrease) in interest income during the period representing the accretion of discount and deferred loan origination fees. For capital adequacy purposes, ratio (as a percent) Banking Regulation, Tier 1 Leverage Capital Ratio, Capital Adequacy, Minimum Unrecognized compensation cost related to non-vested stock-based compensation agreements Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Related party transactions Related Party Transaction [Line Items] Less than 12 Months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Actual, ratio (as a percent) Banking Regulation, Tier 1 Risk-Based Capital Ratio, Actual DEPOSITS Deposit Liabilities Disclosures [Text Block] Income on bank owned life insurance Bank Owned Life Insurance Income Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Schedule of Non-Accrual Loans Financing Receivable, Nonaccrual [Table Text Block] Bank Premises Held for Sale Bank Premises Held for Sale, Policy [Policy Text Block] Bank Premises Held for Sale, Policy Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Condensed Financial Information Disclosure [Abstract] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Stock consideration per share (shares per share) Business Acquisition, Equity Interest Issued Or Issuable, Number of Shares Per Common Share The amount of stock consideration for each share of common stock of held by the acquiree. Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Loan balances: Financing Receivable, after Allowance for Credit Loss [Abstract] Time deposits Time Deposits, Fair Value Disclosure Time Deposits, Fair Value Disclosure Cash Payments to Acquire Businesses, Gross Impairment losses on bank premises held for sale Impairment of Long-Lived Assets to be Disposed of Non-PEO NEO Non-PEO NEO [Member] Commercial real estate - non-owner occupied Commercial Real Estate - Non-Owner Occupied [Member] This member stands for Commercial real estate loan for non-owner occupied houses. Fair value of units granted Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value The fair value at grant date for equity-based awards issued during the period on other than stock (or unit) option plans. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Accumulated Other Comprehensive Income (Loss) [Line Items] Derivative liability notional amount Derivative Liability, Notional Amount Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Schedule of Information Pertaining to Securities Sold Under Agreements to Repurchase Schedule of Repurchase Agreements [Table Text Block] Award Type [Domain] Award Type [Domain] Unrealized gains on derivative instruments Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Compensation Amount Outstanding Recovery Compensation Amount To be well capitalized under prompt corrective action provisions, amount Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum No readily determinable fair value Equity Securities without Readily Determinable Fair Value, Unrealized Gain (Loss) Amount of unrealized gain (loss) on investment in equity security without readily determinable fair value. Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Expected dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Estimated Fair Value Estimate of Fair Value Measurement [Member] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Due after 1 year through 5 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Reclassification adjustment for losses on sale of debt securities available-for-sale realized in income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax 2029 Time Deposit Maturities, Year Four Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] LOANS AND THE ALLOWANCE FOR LOAN LOSSES Financing Receivable, Past Due [Line Items] Due after 5 years through 10 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Number of securities in an unrealized loss position for a period of twelve months or more Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions Nontaxable or nondeductible items: Effective Income Tax Rate Reconciliation, Tax Credit, Amount [Abstract] Appraisal adjustments Measurement Input, Appraised Value [Member] Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Number of subsidiaries Number Of Subsidiaries Number Of Subsidiaries Financial Instruments [Domain] Financial Instruments [Domain] Due after 10 years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 To be well capitalized under prompt corrective action provisions, ratio (as a percent) Common Equity Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Percentage of Common Equity Tier 1 capital ratio (Common Equity Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. Decrease in deferred tax liabilities Total deferred tax liabilities Deferred Tax Liabilities, Gross Schedule of the Effect of Interest Rate Swap Agreements Designated as Cash Flow Hedges on the Consolidated Statements of Income Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Performance restricted stock units Performance Shares [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Purchase of restricted stock Payments to Acquire Restricted Investments Amounts of gross gain (loss) reclassified from accumulated other comprehensive income (loss) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Banking Regulation, Regulatory Capital Requirement, Compliance [Table] Banking Regulation, Regulatory Capital Requirement, Compliance [Table] Minimum Minimum [Member] Net interest income after provision for credit losses Interest Income (Expense), after Provision for Loan Loss Income Tax Authority, Name [Domain] Income Tax Authority, Name [Domain] LOANS AND THE ALLOWANCE FOR LOAN LOSSES Accounts, Notes, Loans and Financing Receivable [Line Items] Company Selected Measure Name Company Selected Measure Name Fair Value Disclosure Item Amounts [Domain] Fair Value Measurement [Domain] Net income Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax Schedule of Commitments and Conditional Obligations Schedule of Fair Value, off-Balance-Sheet Risks [Table Text Block] For capital adequacy purposes, amount Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum BORROWINGS Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Stock appreciation rights Stock Appreciation Rights (SARs) [Member] Adjustment for performance condition (in dollars per share) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other than Options, Adjustment For Performance Condition, Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other than Options, Adjustment For Performance Condition, Weighted Average Grant Date Fair Value Numerator for earnings per share - diluted Net Income (Loss) Available to Common Stockholders, Diluted Collateral Held [Domain] Collateral Held [Domain] Allowance for credit losses on unfunded commitments Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities Goodwill Deferred Tax Liabilities, Goodwill Weighted average common shares outstanding, including all dilutive potential shares (in shares) Weighted Average Number of Shares Outstanding, Diluted Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Total current Current Federal, State and Local, Tax Expense (Benefit) Weighted average remaining contractual term Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms Proceeds from bank owned life insurance Proceeds from Life Insurance Policy Entity Small Business Entity Small Business Percentage of voting interests acquired Business Combination, Voting Equity Interest Acquired, Percentage Income Tax Disclosure [Abstract] Accrual recognized in other noninterest expense Loss Contingency, Loss in Period Adjustment for performance condition (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Performance Adjustment Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Performance Adjustment Readily Determinable Fair Value Debt Securities, Trading, and Equity Securities, FV-NI, Cost [Abstract] Preferred stock, outstanding (in shares) Preferred Stock, Shares Outstanding State Current State and Local Tax Expense (Benefit) Document Transition Report Document Transition Report Due after 1 year through 5 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Other assets Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent Reportable Legal Entities Reportable Legal Entities [Member] Preferred stock, $0.01 par value; 25,000,000 shares authorized; none issued or outstanding Preferred Stock, Value, Outstanding Underlying Securities Award Underlying Securities Amount Bank Investment In Bank Subsidiary This element represents amount of investment in bank subsidiary. Time deposits in denominations of $100,000 or more Time Deposits, $100,000 or More Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date Subsequent Events Subsequent Events, Policy [Policy Text Block] INCOME TAXES Income Tax Disclosure [Text Block] Investments in unconsolidated subsidiaries Investments in Affiliates, Subsidiaries, Associates, and Joint Ventures, Fair Value Disclosure Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Amortization of discount on Federal Home Loan Bank advances Amortization of Debt Discount (Premium) Document Type Document Type Level 3 Inputs Fair Value, Inputs, Level 3 [Member] Outstanding (in shares) Outstanding (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position [Abstract] EARNINGS PER SHARE Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Loss Contingencies [Table] Loss Contingencies [Table] Marketable Securities [Table] Marketable Securities [Table] Marketing and customer relations Marketing and Advertising Expense Product and Service [Axis] Product and Service [Axis] Revolving Loans Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff Revenue Revenue from Contract with Customer, Excluding Assessed Tax Broker-Dealer [Abstract] Bank premises held for sale, measurement input Long-Lived Asset, Held-For-Sale, Measurement Input Long-Lived Asset, Held-For-Sale, Measurement Input Statistical Measurement [Axis] Statistical Measurement [Axis] Additions Finite-Lived Intangible Assets Acquired Service charges on deposit accounts Service charges on deposit accounts The amount of Service charges on deposit accounts. Proceeds from maturities of interest-bearing time deposits with banks Proceeds From Maturities Of Interest-Bearing Time Deposits With Banks Proceeds From Maturities Of Interest-Bearing Time Deposits With Banks One-to-four family residential real estate property One-to-four family residential real estate property Represents information pertaining to one-to-four family residential real estate property. Year two Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff FAIR VALUE OF FINANCIAL INSTRUMENTS Fair Value Measurement Inputs and Valuation Techniques [Line Items] As Reported under ASC 326 Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Taxes paid related to the vesting of restricted stock units Payment, Tax Withholding, Share-Based Payment Arrangement Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Proceeds from long-term Federal Home Loan Bank advances Proceeds from FHLBank Borrowings, Financing Activities Numerator for earnings per share - basic Net Income (Loss) Available to Common Stockholders, Basic Mortgage servicing Fees and Commissions, Mortgage Banking and Servicing Loans acquired which exhibited more-than-insignificant credit deterioration on acquisition date Unpaid principal balance Financing Receivable, Purchased with Credit Deterioration, Amount at Par Value Total other comprehensive income Other comprehensive income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Total expenses Operating Expenses Level 1 Inputs Fair Value, Inputs, Level 1 [Member] Gains (losses) on other assets Gain (Loss) on Disposition of Assets Schedule of PCD Loans at Acquisition Schedule Of Financing Receivable Purchased With Credit Deterioration, Purchase Price [Table Text Block] Tabular disclosure of the components of the purchase price of financing receivables purchased with credit deterioration. Repayment of long-term Federal Home Loan Bank advances Payments of FHLBank Borrowings, Financing Activities Related Party Transaction [Table] Related Party Transaction [Table] EARNINGS PER SHARE - DILUTED (in dollars per share) Earnings per share - diluted (in dollars per share) Earnings Per Share, Diluted FDIC insurance Federal Deposit Insurance Corporation Premium Expense Bank premises held for sale Long-Lived Asset, Held-for-Sale, Fair Value Disclosure Due after 5 years through 10 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Loans held for sale Financing Receivable, Held-for-Sale Treasury stock, (in shares) Treasury Stock, Common, Shares Loans, before allowance for credit losses Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Assets, Loans Before Allowance For Credit Losses Amount of loans before allowance for credit losses acquired at the acquisition date. State Income Tax Paid, State and Local, after Refund Received Consolidation Items [Domain] Consolidation Items [Domain] Derivative Liability, Statement of Financial Position [Extensible Enumeration] Derivative Liability, Statement of Financial Position [Extensible Enumeration] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Auditor Location Auditor Location Fixed interest rate Subordinated Borrowing, Interest Rate Core Deposit Intangible Core Deposits [Member] Acquired Servicing Asset at Fair Value, Additions Schedule of Risk Ratings of Loans, Further Sorted by Origination Year Schedule Of Loans By Credit Quality Indicators, Balance By Origination Year [Table Text Block] Tabular disclosure of financing receivables by credit quality indicator, presenting balance by origination year. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics. Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Comprehensive Income (Loss) Comprehensive Income, Policy [Policy Text Block] Proceeds from sales and redemptions of equity securities Proceeds from sales of equity securities Proceeds from Sale of Equity Securities, FV-NI Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent 2026 Time Deposit Maturities, Year One Total Income Taxes Paid, Net Commitments to extend credit Commitments to Extend Credit [Member] Heartland Bank and Trust Company Heartland Bank Information pertaining to Heartland Bank. 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Two Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer BANK PREMISES AND EQUIPMENT Property, Plant and Equipment Disclosure [Text Block] Schedule of the Company's and the Bank Subsidiaries' Actual and Required Capital Amounts and Ratios Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Loans, before allowance for credit losses Total Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss Fair Value, off-Balance-Sheet Risk [Table] Fair Value, off-Balance-Sheet Risk [Table] SUBORDINATED NOTES Subordinated Borrowings Disclosure [Text Block] Securities sold under agreements to repurchase Balance at end of year Securities Sold under Agreements to Repurchase Expiration Date Trading Arrangement Expiration Date DEPOSITS Time Deposits [Abstract] Increase (decrease) in other liabilities Increase (Decrease) in Other Operating Liabilities 2030 Finite-Lived Intangible Asset, Expected Amortization, Year Five Stockholders' Equity Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Unrealized gains (losses) on equity securities Net unrealized loss (gain) on equity securities Unrealized gains (losses) on equity securities Equity Securities, FV-NI, Unrealized Gain (Loss) Mortgage servicing rights fair value adjustment Decrease in fair value of mortgage servicing rights Mortgage Servicing Rights (MSR) Impairment (Recovery) Bank premises and equipment, net Bank premises and equipment, net Property, Plant and Equipment, Net Numerator: Net Income (Loss) Attributable to Parent [Abstract] Commercial and industrial Commercial And Industrial [Member] This member stands for Commercial and industrial Loans. National Bancorp Statutory Trust I National Bancorp Statutory Trust I Represents the information pertaining to National Bancorp Statutory Trust I. Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Entity Current Reporting Status Entity Current Reporting Status Receivables [Abstract] Schedule of Sales of Debt Securities Sale of Debt Securities Available For Sale [Table Text Block] Tabular disclosure for sale of available for sale debt securities. Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Collateral Held [Axis] Collateral Held [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Due in 1 year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Federal income tax, at US statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Net loss (gain) on disposals of bank premises and equipment Gain (Loss) on Disposition of Property Plant Equipment Issuance of common stock upon vesting of restricted stock units, net of tax withholdings (in shares) Restricted Stock, Shares Issued Net of Shares for Tax Withholdings Acquired Foreclosed Assets, Acquired The amount of foreclosed assets acquired during period. Financial Instrument [Axis] Financial Instrument [Axis] FORCLOSED ASSETS Foreclosed Assets [Text Block] Foreclosed Assets Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] 12 Months or More Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Accounting Standards Update [Domain] Accounting Standards Update [Domain] Loans Financing Receivable [Policy Text Block] State taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Valuation, Market Approach Valuation, Market Approach [Member] Current Fiscal Year End Date Current Fiscal Year End Date Expected life (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Less than 12 Months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Total deposits Total deposits Deposits Nonaccrual With Allowance for Credit Losses Financing Receivable Excluding Accrued Interest, Non Accrual With Allowance for Credit Losses Amortized cost excluding accrued interest, of financing receivable on nonaccrual status with allowance for credit loss. Excludes net investment in lease. Schedule of Major Categories of Loans Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Equity Securities Equity Securities without Readily Determinable Fair Value [Policy Text Block] Derivative financial liabilities fair value Derivative financial liabilities Derivative Liability Real Estate Property, Ownership [Table] Real Estate Property, Ownership [Table] Other noninterest expense Other Noninterest Expense Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Pass Pass [Member] Trust preferred securities qualified as Tier 1 capital Percentage of Trust Preferred Securities Qualified as Tier 1 Capital The percentage of trust preferred securities qualified as Tier 1 capital. Total Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Proceeds from sales of debt securities Proceeds from Sale and Maturity of Marketable Securities Issuance of common stock in Town and Country acquisition Stock Issued During Period, Value, Acquisitions Net assets acquired Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Denominator: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Collateral-dependent loans Collateral Pledged [Member] Schedule of Loans by Category Based on Current Payment and Accrual Status Financing Receivable, Past Due [Table Text Block] Federal Home Loan Bank advances FHLB borrowings Federal Home Loan Bank, Advance, Maturity, Year One Interest-bearing Total interest-bearing deposits Interest-Bearing Deposit Liabilities Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Measure: Measure [Axis] Derivatives AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Thereafter Finite-Lived Intangible Asset, Expected Amortization, after Year Five Tier 1 Capital (to Average Assets) Banking Regulation, Tier 1 Leverage Capital [Abstract] Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Held-to-maturity: Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] Schedule of Option Pricing Model to Value the Stock Appreciation Rights Schedule of Share-based Payment Award, Stock Appreciation Rights, Valuation Assumptions [Table Text Block] Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock appreciation rights, including, but not limited to: (a) expected term of SARs and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Total Capital (to Risk Weighted Assets) Banking Regulation, Total Capital [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Risk-free interest rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Entity Tax Identification Number Entity Tax Identification Number Grantee Status [Axis] Grantee Status [Axis] Valuation Technique, Discounted Cash Flow Valuation Technique, Discounted Cash Flow [Member] Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Assigned Value The weighted average fair value at grant date for equity-based awards issued during the period on other than stock (or unit) option plans. Tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Percent Year four Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff Gross realized losses Debt Securities, Available-for-Sale, Unrealized Loss Common stock, issued (in shares) Common Stock, Shares, Issued Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative Asset, Statement of Financial Position [Extensible Enumeration] Agency commercial Commercial Mortgage-Backed Securities [Member] Schedule of the Effect of Interest Rate Contracts Not Designated as Hedging Instruments Recognized in Other Noninterest Income Derivatives Not Designated as Hedging Instruments [Table Text Block] Current Current Federal, State and Local, Tax Expense (Benefit) [Abstract] Loans held for sale Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Assets, Loans Held For Sale Amount of loans held for sale acquired at the acquisition date. Entity Public Float Entity Public Float Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Earnings per share - basic (in dollars per share) Business Combination, Pro Forma Information, Pro Forma Earnings Per Share, Basic Subsequent term Debt Instrument, Subsequent Floating Rate Term Debt Instrument, Subsequent Floating Rate Term Loss Contingencies [Line Items] Loss Contingencies [Line Items] Security Exchange Name Security Exchange Name LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES Financing Receivables [Text Block] Capitalized servicing rights Servicing Asset at Fair Value, Capitalized Servicing Rights The value of capitalized servicing assets, subsequently measured at fair value. Proceeds from paydowns, maturities, and calls of debt securities Proceeds from Maturity, Repayment, and Call, Debt Security, Trading, Held-for-Investment Multi-family Multi-Family Loan [Member] This member stands for multi-family loans. Statement [Line Items] Statement [Line Items] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Issuance of common stock upon vesting of restricted stock units, net of tax withholdings Restricted Stock, Value, Shares Issued Net of Tax Withholdings Bank Owned Life Insurance Bank Owned Life Insurance Policy [Policy Text Block] Bank Owned Life Insurance Policy Common Stock Common Stock [Member] Wealth management fees Wealth management fees The amount of Wealth management fees. Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Pass-Watch Pass-Watch [Member] A pass-watch loan is still considered a "pass" credit and is not a classified asset, but is a reflection of a borrower who exhibits credit weaknesses or downward trends warranting close attention and increased monitoring. These potential weaknesses may result in deterioration of the repayment prospects for the loan. No loss of principal or interest is expected, and the borrower does not pose sufficient risk to warrant classification Percentage of the number of units granted that may be earned Percentage of Units Granted That May Be Earned Represents the percentage of the number of units granted that may be earned. NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS NET DECREASE IN CASH AND EQUIVALENTS Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Servicing Asset at Fair Value, Amount [Roll Forward] Servicing Asset at Fair Value, Amount [Roll Forward] Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Reciprocal transaction deposits, interest bearing demand deposits Interest-Bearing Domestic Deposit, Reciprocal The amount of Reciprocal Transaction deposits made in interest bearing demand deposits. Statistical Measurement [Domain] Statistical Measurement [Domain] Bank premises and equipment Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Grant Date Assigned Value [Abstract] No definition available. Schedule of Condensed Parent Company Only Balance Sheets Condensed Balance Sheet [Table Text Block] Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Interest Rate Swap Interest Rate Swap [Member] Other purchase accounting adjustments Deferred Tax Assets Other Purchase Accounting Adjustments Deferred Tax Assets Other Purchase Accounting Adjustments Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Bank owned life insurance Bank Owned Life Insurance Interest-Bearing Time Deposits with Banks Interest-Bearing Time Deposits with Banks, Policy [Policy Text Block] Interest-Bearing Time Deposits with Banks, Policy Business acquisition, equity interest issued or issuable (in shares) Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares Maximum deferred interest period quarters Maximum Deferred Period of Interest, Quarters The number quarters the interest payment can be deferred. Nonaccrual With No Allowance for Credit Losses Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance Pledged Status [Axis] Pledged Status [Axis] Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Undistributed earnings from bank subsidiary Undistributed Earnings, Bank Subsidiaries The amount of undistributed earnings from bank subsidiaries. EARNINGS PER SHARE - BASIC (in dollars per share) Earnings per share - basic (in dollars per share) Earnings Per Share, Basic Financing Receivable, Nonaccrual [Table] Financing Receivable, Nonaccrual [Table] Total deferred tax assets Deferred Tax Assets, Gross Discount rate Measurement Input, Discount Rate [Member] Deferred Deferred Federal, State and Local, Tax Expense (Benefit) [Abstract] 2030 Time Deposit Maturities, Year Five Debt securities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Debt Securities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Debt Securities Decrease (increase) in accrued interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Gross Unrecognized Gains Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain Contractual Amount Fair Value Disclosure, off-Balance-Sheet Risks, Amount, Asset Measurement Input Type [Domain] Measurement Input Type [Domain] Net gain on sales of foreclosed assets Foreclosed Asset, Gain (Loss) On Foreclosure The amount of gain (loss) resulting from sale of foreclosed assets. Schedule of Assets Measured at Fair Value on a Nonrecurring Basis Fair Value Measurements, Nonrecurring [Table Text Block] Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] Increase in cash surrender value of bank owned life insurance Increase (Decrease) in Insurance Assets Compensation related Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits Charge-offs Total Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Schedule of Activity in Mortgage Servicing Rights Schedule of Servicing Assets at Fair Value [Table Text Block] Taxable Interest Income, Securities, Operating, Taxable Accounts and Financing Receivables [Table] Accounts and Financing Receivables [Table] Other comprehensive income before reclassifications OCI, before Reclassifications, Net of Tax, Attributable to Parent DERIVATIVE FINANCIAL INSTRUMENTS Derivative Instruments, Gain (Loss) [Line Items] Total stock-based compensation expense Share-Based Payment Arrangement, Expense Hedging Designation [Domain] Hedging Designation [Domain] Financing receivable, accrued interest, after allowance for credit loss Financing Receivable, Accrued Interest, after Allowance for Credit Loss Goodwill and Intangible Assets Disclosure [Abstract] Net unrealized gains (losses) on equity securities: Equity Securities, FV-NI, Unrealized Gain (Loss) [Abstract] Total liabilities and stockholders’ equity Liabilities and Equity Issuance of common stock in Town and Country acquisition (in shares) Stock Issued During Period, Shares, Acquisitions Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Reclassifications Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Other Deferred Tax Assets, Other Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust [Abstract] Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust [Abstract] Stockholders' Equity Stockholders' Equity, Number of Shares, Par Value and Other Disclosure [Abstract] Accounting Policies [Abstract] Accounting Policies [Abstract] Schedule of Expenses Related to the Acquisition Schedule Of Expenses Incurred Related To Business Acquisition [Table Text Block] Tabular disclosure of the expenses incurred related to the business acquisition. 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Allowance for credit losses on non-PCD loans Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets 2027 Time Deposit Maturities, Year Two 2029 Finite-Lived Intangible Asset, Expected Amortization, Year Four For capital adequacy purposes, ratio (as a percent). 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Debt Securities, Trading, and Equity Securities, FV-NI [Table] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Junior subordinated debentures issued to capital trusts Junior subordinated debentures Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust Mortgage loans serviced for others Servicing Assets To Others Not Separately Reported Fair value of an asset serviced to other not separately reported net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. CASH FLOWS FROM INVESTING ACTIVITIES Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Accrued interest receivable Interest Receivable Related Party Transactions [Abstract] Cash Flow Hedging Cash Flow Hedging [Member] Vehicles Automobiles [Member] Other liabilities Other Liabilities Goodwill Goodwill Goodwill Equity securities with readily determinable fair value Carrying value Equity securities with readily determinable fair values Equity Securities, FV-NI Federal Deferred Federal Income Tax Expense (Benefit) Auditor Name Auditor Name LOAN SERVICING Transfers and Servicing of Financial Assets [Text Block] Amortized Cost Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date [Abstract] Adjustment, income tax assets and liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Income Tax Assets And Liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Income Tax Assets And Liabilities SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION Supplemental Cash Flow Information [Abstract] Other Performance Measure, Amount Other Performance Measure, Amount Fair Value of Financial Instruments Fair Value Measurement, Policy [Policy Text Block] FFBI Capital Trust I FFBI Capital Trust I Represents the information pertaining to FFBI Capital Trust I. Collectively evaluated for impairment Financing Receivable, Allowance for Credit Loss, Collectively Evaluated Related Party [Domain] Related and Nonrelated Parties [Domain] Percentage of securities with general obligation issue Percentage of Securities with General Obligation Issue Percentage of securities with general obligation issue. Foreclosed assets Repossessed Assets Amount Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Real Estate Real Estate [Member] Constant pre-payment rates (CPR) Measurement Input, Constant Prepayment Rate [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Proceeds from redemption of restricted stock Proceeds from Sale of Restricted Investments No Readily Determinable Fair Value Equity Securities without Readily Determinable Fair Value, Annual Amount [Abstract] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Financial liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Surplus Additional Paid in Capital, Common Stock Entity [Domain] Entity [Domain] Net cash provided by (used in) investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Investments in unconsolidated subsidiaries Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures 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] Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Total awards classified as equity Total awards classified as equity Represents the information pertaining to total awards classified as equity. Income tax expense Effective Income Tax Rate Reconciliation, Percent Carrying Amount Reported Value Measurement [Member] Plan Name [Domain] Plan Name [Domain] Acquisition related expenses Business Combination, Acquisition-Related Cost, Expense Schedule of Interest Rates and Maturities of the Junior Subordinated Debentures Schedule of Subordinated Borrowing [Table Text Block] Weighted average remaining service period Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition PCD allowance established in acquisition Allowance for credit losses at acquisition Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date Employees contributions vesting period Deferred Compensation Arrangement with Individual, Requisite Service Period Upward adjustment on equity securities with no readily determinable fair value Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount Goodwill and Other Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Derivative Financial Instruments Derivatives, Policy [Policy Text Block] SEGMENT INFORMATION Segment Reporting Disclosure [Text Block] Goodwill [Table] Goodwill [Table] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] U.S. Treasury US Treasury Securities [Member] Federal Current Federal Tax Expense (Benefit) New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Data processing Information Technology and Data Processing Unrealized Loss Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Other liabilities Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Comprehensive Income (Loss) Note [Text Block] Weighted Average Weighted Average [Member] Lease Obligations Lessee, Leases [Policy Text Block] Amortization of intangible assets Amortization of intangibles Amortization Amortization of Intangible Assets Schedule of the Activity and Accumulated Balances for Components of Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block] Total depreciation expense Depreciation, Depletion and Amortization Purchases of bank premises and equipment Payments to Acquire Buildings Number of risk participation agreements Derivative, Number Of Risk Participation Agreements Sold Derivative, Number Of Risk Participation Agreements Sold Agency residential Residential Mortgage-Backed Securities [Member] Arrangement Duration Trading Arrangement Duration Schedule of the Initial Cost and Carrying Value of Equity Securities with Cumulative Net Unrealized Gains and (Losses) Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Share price (in dollars per share) Share Price STOCK-BASED COMPENSATION PLANS Share-Based Payment Arrangement [Text Block] Class of Financing Receivable, Type of Borrower [Domain] Class of Financing Receivable, Type of Borrower [Domain] Intangible assets Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill Cash and cash equivalents Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent Allowance for credit losses on unfunded commitments Off-Balance-Sheet, Credit Loss, Liability ASSETS Assets [Abstract] Credit Facility [Axis] Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Debt Instrument [Axis] Debt Instrument [Axis] AOCI Attributable to Parent [Abstract] AOCI Attributable to Parent [Abstract] 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 FAIR VALUE OF FINANCIAL INSTRUMENTS Fair Value Disclosures [Text Block] Banking and Thrift, Other Disclosure [Abstract] Banking and Thrift, Other Disclosure [Abstract] Heartland Bancorp, Inc. Capital Trust D Heartland Bancorp, Inc. Capital Trust D Represents the information pertaining to Heartland Bancorp, Inc. Capital Trust D. Business Combination [Line Items] Business Combination [Line Items] Loss on extinguishment of debt Net loss (gain) on extinguishment of subordinated debt Gain (Loss) on Extinguishment of Debt Credit Facility [Domain] Credit Facility [Domain] Time Time Deposits, Excluding Brokered Time Deposits, Excluding Brokered Debt securities, available-for-sale, accrued interest Debt Securities, Available-for-Sale, Accrued Interest The amount of accrued interest on available for sale debt securities. 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Debt Subordinated notes, at face value Debt Instrument, Face Amount Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] Common stock Business Combination, Consideration Transferred, Equity Interest Non-bank Investment In Non Bank Subsidiary This element represents amount of investment in non bank subsidiary. Name Awards Close in Time to MNPI Disclosures, Individual Name Collectively evaluated for impairment Financing Receivable, Collectively Evaluated for Credit Loss Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Town and Country Town and Country Financial Corporation [Member] Represents information pertaining to Town and Country Financial Corporation. ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Defined contribution plan, employer matching contribution, percent of employees' gross pay Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Stock-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Impairments of downward adjustments Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount Credit exposure collateral Federal Home Loan, Collateral Federal Home Loan, Collateral Schedule of Condensed Parent Company Only Statements of Income Condensed Income Statement [Table Text Block] Litigation Case [Axis] Litigation Case [Axis] Auditor Firm ID Auditor Firm ID Initial term after issuance Debt Instrument, Term Of Fixed Interest Rate Debt Instrument, Term Of Fixed Interest Rate SECURITIES Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] DeBaere And Miller Cases DeBaere And Miller Cases [Member] DeBaere And Miller Cases Schedule of Impact ASC 326 on the Allowance for Credit Losses Accounting Standards Update and Change in Accounting Principle [Table Text Block] Non-credit discount Financing Receivable, Purchased with Credit Deterioration, Discount (Premium) One-to-four family residential One-To-Four Family Residential [Member] This member stands for one-to-four family residential loans. Available-for-Sale AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] INTEREST EXPENSE Interest Expense, Operating and Nonoperating [Abstract] Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Number of loans in the process of foreclosure Mortgage Loans in Process of Foreclosure, Number Of Loans Number of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process. Fair Value Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] Subordinated notes Subordinated notes, at carrying value Subordinated Debt Year two Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year Fair Value Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] Total liabilities assumed Business Combination, Recognized Liability Assumed, Liability Expired (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options, Expired in Period, Weighted Average Grant Date Assigned Value Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options, Expired in Period, Weighted Average Grant Date Assigned Value Subordinated notes Subordinated Debt [Member] Financial Asset, Aging [Axis] Financial Asset, Aging [Axis] All Executive Categories All Executive Categories [Member] Schedule of Components of the Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Taxable Interest and Fee Income, Loans and Leases Share-Based Payment Arrangement, Employee Share-Based Payment Arrangement, Employee [Member] COMMITMENTS AND CONTINGENCIES (Note 23) Commitments and Contingencies Year one Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff Debt Securities Debt Securities [Policy Text Block] Debt Securities Business Combination [Axis] Business Combination [Axis] Accounting Standards Update and Change in Accounting Principle [Table] Accounting Standards Update and Change in Accounting Principle [Table] Loan amount in the process of foreclosure Mortgage Loans in Process of Foreclosure, Amount Net deferred tax asset Deferred Tax Assets, Net PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Due after 10 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Other Other Primary Collateral [Member] Information pertaining to primary collateral type identified as "other". Hedging Designation [Axis] Hedging Designation [Axis] Other interest and dividend income Other Interest and Dividend Income Debt instruments Debt Instrument, Fair Value Disclosure Net decrease in short-term Federal Home Loan Bank advances Proceeds from (Repayments of) Short-Term from FHLBank Borrowings, Short Term, Financing Activities Proceeds from (Repayments of) Short-Term from FHLBank Borrowings, Short Term, Financing Activities Allowance for Credit Losses Debt Securities, Held-to-Maturity, Allowance for Credit Loss Derivative Contract [Domain] Derivative Contract [Domain] Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Foreclosed assets, measurement input Foreclosed Assets, Measurement Input Foreclosed Assets, Measurement Input Due after 10 years Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 All Individuals All Individuals [Member] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Expired (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Expirations Name Forgone Recovery, Individual Name 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] Individually evaluated for impairment Amortized Cost Financing Receivable, Individually Evaluated for Credit Loss Amortized Cost Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] Year five Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff Schedule of Risk Participation Agreement Schedule of Derivative Instruments [Table Text Block] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Intangible Asset, Finite-Lived [Table] Intangible Asset, Finite-Lived [Table] Changes in other assets and liabilities, net Increase (Decrease) in Other Operating Assets and Liabilities, Net Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Accounting Standards Update 2023-02 Accounting Standards Update 2023-02 [Member] Total revenues (net interest income and noninterest income) Business Combination, Pro Forma Information, Pro Forma Revenue Actual, ratio (as a percent) Common Equity Tier One Risk Based Capital To Risk Weighted Assets Common Equity Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent). Earnings allocated to participating securities Participating Securities, Distributed and Undistributed Earnings (Loss), Basic Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Title of 12(b) Security Title of 12(b) Security PROVISION FOR CREDIT LOSSES Provision for credit losses Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) Net cash paid for income taxes: Income Taxes Paid, Net [Abstract] OTHER COMPREHENSIVE INCOME Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Furniture and equipment Equipment Expense Earnings Per Share [Abstract] Earnings Per Share [Abstract] Restricted stock Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restricted Stock The amount of restricted stock recognized as of the acquisition date. Interest-bearing time deposits with banks Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Interest Bearing Time Deposits With Banks The amount of interest-bearing time deposits with banks recognized as of the acquisition date. Mortgage servicing rights Deferred Tax Liabilities, Mortgage Servicing Rights Gross realized gains Debt Securities, Available-for-Sale, Unrealized Gain Securities sold under agreements to repurchase Interest Expense, Securities Sold under Agreements to Repurchase Direct write-downs Foreclosed Asset, Direct Write-Downs The amount of direct write down of foreclosed asset to reduce it's value with the intent to offset a loss or expense. Illinois Department Of Revenue Illinois Department Of Revenue [Member] Illinois Department Of Revenue Schedule of Interest Expense on Deposits Interest Income and Interest Expense Disclosure [Table Text Block] Town and Country Statutory Trust II Town And Country Statutory Trust II [Member] Represents the information pertaining to Town and Country Statutory Trust II. Year three Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff Schedule of Gross Charge-Offs, Further Sorted by Origination Year Schedule Of Loans By Credit Quality Indicators, Gross Write-offs By Origination Year [Table Text Block] Tabular disclosure of financing receivables by credit quality indicator, presenting gross write-offs by origination year. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics. Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Forfeitures Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Repurchase of common stock (in shares) Treasury Stock, Shares, Acquired Award Timing Disclosures [Line Items] Securities sold under agreements to repurchase Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure Measurement Frequency [Domain] Measurement Frequency [Domain] Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Exercised Bank premises held for sale Asset, Held-for-Sale, Not Part of Disposal Group Payments for legal settlements Payments for Legal Settlements State Deferred State and Local Income Tax Expense (Benefit) Loans, net of allowance for credit losses Loans Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss Proceeds from sale of mortgage loans Proceeds from Sale, Loan, Mortgage, Held-for-Sale Illinois ILLINOIS NET INCOME NET INCOME Net income Net Income (Loss) Attributable to Parent Net gain on bank owned life insurance proceeds Insured Event, Gain (Loss) Actual, ratio (as a percent) Banking Regulation, Total Risk-Based Capital Ratio, Actual Gains on sale of mortgage loans Net gain on sale of mortgage loans Gain (Loss) on Sale of Mortgage Loans Schedule of Expense Differs from the Statutory Federal Rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Preferred stock, authorized (in shares) Preferred Stock, Shares Authorized Held-to-Maturity AOCI, Accumulated Gain (Loss), Debt Securities, Held-To-Maturity, Parent [Member] Accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (held-for-sale), including portion attributable to noncontrolling interest. Repurchase of common stock Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Town and Country Statutory Trust III Town And Country Statutory Trust III [Member] Represents the information pertaining to Town and Country Statutory Trust III. Prepaid assets Deferred Tax Liabilities, Prepaid Expenses Financing Receivable, Past Due [Table] Financing Receivable, Past Due [Table] Transfers of bank premises and equipment to bank premises held for sale Transfer of Premises and Equipment to Held For Sale Value of premises and equipment transferred to held for sale in non cash transactions. Customer Relationship Intangible Customer Relationships [Member] Employee Benefit Plans and Stock Based Compensation Compensation Related Costs, Policy [Policy Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Money market Deposits, Money Market Deposits Schedule of Foreclosed Assets Activity Foreclosed Asset, Activity, Roll Forward [Table Text Block] Tabular disclosure of the change in foreclosed assets taken in settlement of troubled loans through surrender or foreclosure. 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] Omnibus Incentive Plan Omnibus Incentive Plan Represents information pertaining to the Omnibus Incentive Plan. Fair value adjustments attributable to changes in valuation inputs and assumptions Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions Number of securities in an unrealized loss position for a period of less than twelve months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract] Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract] Subsequent Event Type [Domain] Subsequent Event Type [Domain] 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 Deferred Tax Liabilities, Other Statement [Table] Statement [Table] Deferred income tax expense Deferred income tax expense (benefit) Deferred Income Tax Expense (Benefit) 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] CASH FLOWS FROM FINANCING ACTIVITIES Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Net gain on sales Foreclosed Asset, Gain (Loss) On Sale The net gain (loss) resulting from sale of foreclosed asset. Cumulative net unrealized gains (losses) Equity Securities, FV-NI, Unrealized Gain (Loss), Cumulative Amount of cumulative unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). All Adjustments to Compensation All Adjustments to Compensation [Member] Gains (losses) on foreclosed assets Gains on foreclosed assets Gains (Losses) On Foreclosed Assets Total Gains (losses) on foreclosed assets Amendment Flag Amendment Flag Salaries Salaries Salary and Wage, Excluding Cost of Good and Service Sold Authorized number of shares (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Transfers and Servicing [Abstract] Transfers and Servicing [Abstract] Treasury stock at cost, 1,467,180 shares at 2025 and 1,267,673 at 2024 Treasury Stock, Common, Value Termination Date Trading Arrangement Termination Date Interest-bearing deposits with banks Interest-Bearing Deposits in Banks and Other Financial Institutions Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] 2028 Time Deposit Maturities, Year Three Allowance for credit losses Allowance for credit losses on loans Beginning balance Ending balance Total Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Due in 1 year or less Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One Foreclosed asset, selling costs, percentage of fair value Foreclosed Asset, Selling Costs, Percentage Of Fair Value Foreclosed Asset, Selling Costs, Percentage Of Fair Value Gross gains Derivative, Gain on Derivative Amortization of discount and issuance costs on subordinated notes and debentures Amortization Of Subordinated Debt Purchase Accounting Adjustment The amount of Amortization of subordinated debt purchase accounting adjustment. John Pickett Cases John Pickett Cases [Member] John Pickett Cases Real Estate Acquired Through Foreclosure [Roll Forward] Real Estate Acquired Through Foreclosure [Roll Forward] Real Estate Acquired Through Foreclosure Schedule of Assets Measured at Fair Value on a Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] WEIGHTED AVERAGE SHARES OF COMMON STOCK OUTSTANDING (in shares) Weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Schedule of the Computation of Basic and Diluted Earnings per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Company's Interest-Bearing Deposits Deposit Liabilities, Type [Table Text Block] Land, buildings, and improvements Land, Buildings and Improvements [Member] Segment Reporting [Abstract] Interest-bearing demand Demand Deposit Accounts Debt Disclosure [Abstract] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Axis] Proceeds from sales of foreclosed assets Proceeds from sales Proceeds from sale of foreclosed assets Proceeds from Sale of Foreclosed Assets Realized gains (losses) on sales of securities Net realized loss on sales of securities Debt Securities, Available-for-Sale, Realized Gain (Loss) Unrealized gains on debt securities available-for-sale OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Consolidated Entities [Axis] Consolidated Entities [Axis] Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options, Exercises in Period, Weighted Average Grant Date Assigned Value Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were exercised during the period. Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Deposits Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits Amount of deposits assumed in business combination which has been recognized as of the acquisition date. Commercial real estate - owner occupied Commercial Real Estate - Owner Occupied [Member] This member stands for Commercial real estate loan for owner occupied houses. Schedule of Additional Information About the Unobservable Inputs Used in Fair Value Measurement of Mortgage Servicing Rights Schedule Of Additional Information About Unobservable Inputs Used In Fair Value Of Measurement Of Mortgage Servicing Rights [Table Text Block] Schedule Of Additional Information About Unobservable Inputs Used In Fair Value Of Measurement Of Mortgage Servicing Rights Cumulative net unrealized gains (losses) Equity Securities Without Readily Determinable Fair Value, Price Adjustment, Cumulative Amount, Net Amount of cumulative unrealized gain (loss) on investment in equity security with no readily determinable fair value recognized in net income. Mortgage servicing rights Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Mortgage Servicing Rights The amount of mortgage servicing rights recognized as of the acquisition date. Use of Estimates Use of Estimates, Policy [Policy Text Block] Actual, amount Banking Regulation, Total Capital, Actual Income tax expense Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Occupancy of bank premises Occupancy, Net One time cash payment Litigation Settlement, Amount Awarded to Other Party Total deferred Deferred Federal, State and Local, Tax Expense (Benefit) Amortization of discount and issuance costs on subordinated notes and debentures Amortization of Discounts and Issuance Costs on Subordinated Debt The amount of of amortization of discounts and issuance costs on subordinated notes and junior subordinated debentures. Insider Trading Arrangements [Line Items] Prior Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year Stock-based compensation plans Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Current Financial Asset, Not Past Due [Member] Allowance for Credit Losses Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest Total liabilities Total liabilities Liabilities Common stock, $0.01 par value; 125,000,000 shares authorized; shares issued of 32,899,104 at 2025 and 32,827,039 at 2024; shares outstanding of 31,431,924 at 2025 and 31,559,366 at 2024 Common Stock, Value, Outstanding Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Interest rate swaps with a financial institution counterparty Financial Institutions Borrower [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Net decrease (increase) in loans Payments for (Proceeds from) Loans and Leases Savings Deposits, Savings Deposits FHLB advances Business Combination, Recognized Liability Assumed, Long-Term Debt, Noncurrent Consolidation Items [Axis] Consolidation Items [Axis] Subordinated notes Interest Expense, Subordinated Notes and Debentures Schedule of Quantitative Information About the Unobservable Inputs Used in Non-Recurring Level 3 Fair Value Measurements Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block] Schedule of Restricted Stock Units Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Deferred tax liabilities Components of Deferred Tax Liabilities [Abstract] Total Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Corporate Corporate Debt Securities [Member] Accounting Standards Update 2016-13 [Member]