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Net change fair value of ESOP shares Organization, Consolidation and Presentation of Financial Statements [Line items] Organization, Consolidation and Presentation of Financial Statements [Line items] Stockholders' Equity Before Redeemable Common Stock Owned By Employee Stock Ownership Plan Stockholders' Equity Before Redeemable Common Stock Owned By Employee Stock Ownership Plan Stockholders' equity before redeemable common stock owned by employee stock ownership plan Amendment Flag Amendment Flag Impairment of Real Estate Write-downs of other real estate owned Interest Income, Securities, Operating, Taxable Taxable securities Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss Amortized cost Amortized Cost Schedule of Held-to-Maturity Securities [Line Items] Schedule of Held-to-maturity Securities [Line Items] Loans charged off Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff Total Entity Address, Postal Zip Code Entity Address, Postal Zip Code Fair Value Fair Value [Abstract] Fair Value Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Increase (Decrease) in Operating Lease Liability Repayment of operating lease liabilities Common Stock [Member] Common Stock Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff Financing receivable, year two, originated, fiscal year before current fiscal year, write-off Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Summary of Actual and Required Capital Ratios Subordinated Debt Obligations, Fair Value Disclosure Subordinated debentures Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss Net loans Net loans Debt Securities, Available-for-Sale [Line Items] Debt Securities, Available-for-sale [Line Items] Accounts Receivable And 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Ratio, Actual Tier 1 Capital to Average Assets, ratio (as a percentage) Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff Financing receivable, year one, originated, current fiscal year, write-off Interest Income, Securities, Operating, Tax Exempt Tax-exempt securities Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value Allocated and single maturity date, total % of Total Loans Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage Fair Value Measurements, Nonrecurring [Table Text Block] Summary of Assets Measured at Fair Value on a Non-recurring Basis Operating Lease, Right-of-Use Asset Operating lease right-of-use assets Debt Securities, Available-for-Sale, Unrealized Loss Position Fair value, total Not Rated Not Rated [Member] Not rated Payments to Acquire Debt Securities, Available-for-Sale Purchases of securities available for sale Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Employee Stock Ownership plan, Employers Matching Contribution, Annual Vesting Percentage Employee Stock Ownership plan, Employers Matching Contribution, Annual Vesting Percentage Employers matching contribution, annual vesting percentage (as a percentage) Agricultural Production And Other Loans To Farmers Agricultural Production And Other Loans To Farmers [Member] Agricultural production and other loans to farmers Document Type Document Type Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Financing Receivable, Individually Evaluated for Credit Loss Collateral-dependent loans, net of allowance for credit losses: Collateral-dependent loans, net of specific allowance for credit losses Income Taxes Paid, Net Federal and state income tax payments Pledged To Secure Public Deposits And For Other Purposes Required Or Permitted By Law Pledged To Secure Public Deposits And For Other Purposes Required Or Permitted By Law [Member] Pledged to secure public deposits and for other purposes required or permitted by law Pledged to Secure Public Deposits and for Other Purposes Required or Permitted by Law Financing Receivable, Modified in Period, Amount Modified loans to borrowers experiencing financial difficulty Entity Central Index Key Entity Central Index Key Debt Securities, Available-for-Sale [Table Text Block] Summary of the Amortized Cost and Fair Value of Securities Available for Sale Investments, Debt and Equity Securities [Abstract] Other Real Estate Owned, Fair Value Disclosure Other Real Estate Owned, Fair Value Disclosure Other real estate owned: Other real estate owned Interest-Bearing Deposits in Banks and Other Financial Institutions Interest bearing deposits with banks Proceeds from Sales of Business, Affiliate and Productive Assets Proceeds from sales of 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Value Per Share Common stock, par value per share (in dollars per share) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other comprehensive (loss) income, net Other comprehensive income, net Total other comprehensive income (loss), net of tax Liabilities: Liabilities [Abstract] Amortized Cost Amortized Cost [Abstract] Amortized Cost Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Debt Securities, Available-for-Sale, Amortized Cost Amortized Cost Other Commercial Other Commercial [Member] Other commercial Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Unrealized losses, less than 12 months Debt Securities, Available-for-Sale Fair Value Noninterest Income [Abstract] Noninterest income: Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery Recoveries on loans Debt Disclosure [Abstract] Proceeds from Sale, Loan, Held-for-Sale Proceeds from loans held for sale Gain From Federal Home Loan Bank Stock Dividends Gain From Federal Home Loan Bank Stock Dividends Federal Home Loan Bank stock dividends Classified Classified [Member] Classified Estimate of Fair Value Measurement [Member] Fair Value Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Tax effect Increase (Decrease) in Time Deposits Certificates of deposit Current Fiscal Year End Date Current Fiscal Year End Date Schedule of Long-Term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Gains (Losses) on Sales of Other Real Estate Net loss (gain) on sales of other real estate owned Document Quarterly Report Document Quarterly Report Receivables [Abstract] Unallocated Financing Receivables [Member] Unallocated Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Entity Address, State or Province Entity Address, State or Province Investment Income, Net, Amortization of Discount and Premium Amortization of equity investments Amortization of equity method investments Preferred Stock, Dividend Rate, Period Of Review For Rate Percentage, After Year 10, Beginning Of Period Preferred Stock, Dividend Rate, Period Of Review For Rate Percentage, After Year Ten , Beginning Of Period Review lookback period after year 10, beginning of period Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number End of period (in shares) Beginning of period (in shares) Debt Issuance Costs, Gross Issuance costs Preferred Stock, Shares Outstanding Preferred stock, ending balance (in shares) Preferred stock, beginning balance (in shares) Preferred stock, shares outstanding (in shares) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Gains Interest Expense, Federal Home Loan Bank and Federal Reserve Bank Advances, Long-Term Advances from Federal Home Loan Bank Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Diluted effect of stock-based awards (in shares) Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss Loans Total Total loans before allowance for credit losses Financing Receivable, Accrued Interest, after Allowance for Credit Loss Accrued interest receivable Payments for (Proceeds from) Businesses and Interest in Affiliates Investment in unconsolidated entities Market Beta Percentage Market beta percentage. Market beta percentage Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Unrealized losses, 12 months or more Interest Expense, Operating Total interest expense Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Interest Income (Expense), after Provision for Loan Loss Net interest income after provision for credit losses Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block] Summary of Quantitative Information About Level 3 Fair Value Measurements for Assets Measured at Fair Value on a Non-recurring Basis Held to Maturity, Fair Value Held to Maturity, Fair Value [Abstract] Fair Value Held to Maturity, Amortized Cost Held to Maturity, Amortized Cost [Abstract] Amortized Cost Debt Instrument, Unamortized Discount Remaining purchase discount AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Debt Securities, Held-to-Maturity [Table] Debt Securities, Held-to-maturity [Table] Regulatory Matters [Abstract] Regulatory Matters [Abstract] Preferred Stock, Value, Issued Senior Non-Cumulative Perpetual Preferred Stock, Series ECIP, no par value 250,000 authorized, issued and outstanding at March 31, 2026 and December 31, 2025; aggregate liquidation preference of $250,000 Minimum Minimum [Member] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Granted (in dollars per share) Credit Rating, S&P And Moody's Credit Rating, S&P And Moody's [Axis] Credit Rating, S&P And Moody's [Axis] Financial Instrument [Axis] Financial Instrument [Axis] Interest Expense, Other Other borrowings Real Estate [Member] Real Estate Credit Loss [Abstract] Premises and equipment on branch sale Disposal Group, Including Discontinued Operation, Property, Plant and Equipment Fair Value, Inputs, Level 3 [Member] Level 3 Fair Value, Nonrecurring [Member] Nonrecurring Liabilities, Fair Value Disclosure [Abstract] Financial liabilities: Repayments of Other Debt Payments on other borrowings Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Summary of Assets and Liabilities Measured on Recurring Basis Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] Subordinated debentures. Subordinated Debentures [Member] Subordinated Debentures Debt Instrument, Redemption, Description, Multiples Which May Be Redeemed Debt Instrument, Redemption, Description, Multiples Which May Be Redeemed Multiples allowed to be redeemed Shares, Outstanding Shares outstanding, ending balance (in shares) Shares outstanding, beginning balance (in shares) Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Summary of Investment Securities That Were in an Unrealized Loss Position Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Summary of the Company’s Loan Portfolio by Loan Class Interest Expense, Operating and Nonoperating [Abstract] Interest expense: Financial Asset, 30 to 89 Days Past Due Financial Asset, 30 to 89 Days Past Due [Member] Past Due 30-89 Days 30-89 Days Past Due Financing Receivable, Modified, Payment Deferral, Period Payment Delay Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Ending of period (in dollars per share) Beginning of period (in dollars per share) Stock Withheld To Satisfy Vesting Of Restricted Stock Obligation During Period, Shares Stock Withheld To Satisfy Vesting Of Restricted Stock Obligation During Period, Shares Shares withheld to satisfy withholding obligation in the vesting of restricted stock (in shares) Operating Lease, Liability Operating lease liabilities Debt Instrument, Basis Spread on Variable Rate Basis spread on variable rate Preferred Stock, Dividend Rate, Percentage Dividends paid initial two years Forecast [Member] Forecast Furniture, Equipment And Data Processing Furniture, Equipment And Data Processing Furniture, equipment and data processing expenses Net interest income Interest Income (Expense), Operating Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss Securities held to maturity Securities held to maturity - fair value $21,478 - 2026; $23,217 - 2025 Amortized Cost Amortized Cost Financing Receivable, 90 Days or More Past Due, Still Accruing Past Due 90 days or more and Accruing Long-Term Debt, Type [Domain] Long-term Debt, Type [Domain] Weighted Average Number of Shares Outstanding, Basic Weighted average common shares outstanding (in shares) Scenario [Axis] Scenario [Axis] Deposit premium percentage Deposit premium percentage. Deposit premium percentage Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff Prior Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Unrealized losses, 12 months or more Interest Payable Accrued interest payable Loans Receivable, Fair Value Disclosure Loans, net Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss Unrealized losses, total APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Stock based compensation Equity, Attributable to Parent Shareholders' equity, ending balance Shareholders' equity, beginning balance Total shareholders' equity Preferred Stock, Par or Stated Value Per Share Preferred stock, par value (in dollars per share) Cash paid Cash Paid Cash paid. 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Proceeds from term loan Financial Asset, Not Past Due [Member] Current Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Interest Paid, Excluding Capitalized Interest, Operating Activities Interest paid Measurement Basis [Axis] Measurement Basis [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Temporary Equity, Fair Value Per Share Temporary Equity, Fair Value Per Share Temporary equity (in dollars per share) Share-Based Payment Arrangement, Expense Stock based compensation expense Noncash or Part Noncash Acquisition, Fixed Assets Acquired Acquisition of real estate in non-cash foreclosures Document Period End Date Document Period End Date Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year Financing receivable, year five, originated, four years before current fiscal year OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax Change in unrealized gains (losses) on securities available for sale Unrealized gains (losses) on securities available for sale Gain (Loss) on Disposition of Property Plant Equipment Net (gain) loss on sales of premises and equipment Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year Prior Statement of Financial Position [Abstract] Cumulative Effect, Period of Adoption, Adjustment [Member] Cumulative Effect, Period of Adoption, Adjustment Advances From Federal Home Loan Bank And Other Borrowings Advances from federal home loan bank and other borrowings. Advances from Federal Home Loan Bank and other borrowings Gain on sale assets held for sale Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Financing Receivable, Collateral Dependent Loan Financing Receivable, Collateral Dependent Loan [Table Text Block] Summary of Collateral Dependent Loans by Class and Collateral Type Class of Stock [Axis] Class of Stock [Axis] Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Unrealized loss position, number of positions Compensation and Employee Benefit Plans [Text Block] Employee Benefits Employee Stock Ownership Plan Employee Stock Ownership Plan [Member] Employee Stock Ownership Plan Financial Asset, Aging [Domain] Financial Asset, Period Past Due [Domain] Liabilities Total liabilities Financial Instruments [Domain] Financial Instruments [Domain] Reclassification from AOCI, Current Period, before Tax, Attributable to Parent Reclassification adjustment for net loss included in net income 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Loss Unrealized losses, less than 12 months Weighted Average Number of Shares Outstanding, Diluted Diluted common shares (in shares) Entity File Number Entity File Number Payments of Ordinary Dividends, Common Stock Cash dividends paid on common stock Debt Instrument Redemption Price Amount Debt Instrument Redemption Price Amount Other Assets Other assets Financing Receivable, Excluding Accrued Interest, Nonaccrual Total Nonaccrual Cover [Abstract] Measurement Input Type [Axis] Measurement Input Type [Axis] Increase (Decrease) in Accounts Payable and Accrued Liabilities Accrued interest payable and other liabilities Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Forfeited (in shares) Forfeited (in shares) Subordinated Debt [Member] Subordinated Debt Financial Asset, Aging [Axis] Financial Asset, Period Past Due [Axis] Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest Beginning balance Impact of adopting CECL Allowance for credit losses Ending balance Allowance for Credit Losses Scenario [Domain] Scenario [Domain] US Treasury Securities [Member] U.S. Treasuries Sale of Stock [Domain] Sale of Stock [Domain] Alternative Investment, Measurement Input Measurement input (as a percentage) Collateralized Mortgage-Backed Securities [Member] Mortgage-backed securities Debt Instrument, Right To Defer Payment Of Interest, Period Debt Instrument, Right To Defer Payment Of Interest, Period Period to defer payment of interest (not exceeding) (in years) Derivative Assets (Liabilities), at Fair Value, Net Total recurring fair value measurements Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities Maturities, prepayments and calls of securities held to maturity Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year Financing receivable, year four, originated, three years before current fiscal year Gain (Loss) on Extinguishment of Debt Gain (Loss) on Extinguishment of Debt, Total Loss on early extinguishment of subordinated debentures Loss on early extinguishment of subordinated debentures Loss on extinguishment of debt Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff Financing receivable, year three, originated, two years before current fiscal year, write-off New Accounting Pronouncements, Policy [Policy Text Block] Effect of Recently Adopted Accounting Standards and Effect of Recently Issued, But Not Yet Effective Accounting Standards Subordinated Debt Subordinated debentures Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Vesting period (in years) Proceeds from FHLBank Borrowings, Financing Activities Proceeds from Federal Home Loan Bank advances Construction Loans [Member] Construction and land development Real Estate Portfolio Segment Real Estate Portfolio Segment [Member] Real estate Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed Redemption price (as a percentage) Reported Value Measurement [Member] Carrying Value Credit Rating, S&P And Moody's [Domain] Credit Rating, S&P And Moody's [Domain] Credit Rating, S&P And Moody's [Domain] Common Stock, Shares, Outstanding Common stock, shares outstanding (in shares) Depreciation, Depletion and Amortization Depreciation and amortization Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Document Transition Report Document Transition Report S&P AA plus, AA, AA minus / Moody's Aa1, Aa2, Aa4 S&P AA plus, AA, AA minus / Moody's Aa1, Aa2, Aa4 [Member] S&P: AA+, AA, AA- / Moody's: Aa1, Aa2, Aa3 Real Estate Loan [Member] Residential properties Residential real estate: Debt Securities, Held-to-Maturity, 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Proceeds From Term Loan And Cash On Hand For Redemption Proceeds from term loan and cash on hand for redemption. Proceeds from term loan and cash on hand Assets [Abstract] Assets: Federal Home Loan Bank Stock FHLB stock Document Fiscal Year Focus Document Fiscal Year Focus Payment for Origination and Purchase, Loan, Held-for-Sale Origination of loans held for sale Financing Receivable, Modified [Table Text Block] Summary of Modifications by Class and Modification Type Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities: Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year, Writoff Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year, Writoff [Abstract] Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year, Writoff [Abstract] Unfunded Loan Commitment [Member] Unfunded Loan Commitment Payments of Ordinary Dividends, Preferred Stock and Preference Stock Cash dividends paid on preferred stock Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Investment Securities Gain (Loss) on Disposition of Business Gain on sale of branches First Bancshares Of Baton Rouge Statutory Trust I First Bancshares Of Baton Rouge Statutory Trust I [Member] First Bancshares of Baton Rouge Statutory Trust I Financial Assets, Fair Value, Level 2 Inputs Financial Assets, Fair Value, Level 2 Inputs [Abstract] Level 2 inputs: Fair Value Measurement, Policy [Policy Text Block] Financial Instruments Measured at Fair Value Investment Securities, Pledged To Secure Public Deposits And Other Investment Securities, Pledged To Secure Public Deposits And Other [Table Text Block] Summary of the Amortized Cost and Fair Value for Investment Securities Fees and Commissions, Mortgage Banking and Servicing Mortgage origination income Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) Provision for (recovery of) loan credit losses Other Liabilities Other liabilities Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] Fair Value Disclosures [Abstract] Commitments and Contingencies Disclosure [Abstract] Five Point Five Zero Percent Fixed to Floating Rate Subordinated Notes Due 2030 Five Point Five Zero Percent Fixed to Floating Rate Subordinated Notes Due 2030 [Member] 5.50% Fixed to Floating Rate Subordinated Notes Due 2030 Sale of Stock, Consideration Received on Transaction Aggregate purchase price of shares Net Income (Loss) Available to Common Stockholders, Basic Net income available to common shareholders Net income available to common shareholders - basic Third Party Appraisals and Internal Evaluations [Member] Third party appraisals and internal evaluations. Third-party appraisals and internal evaluations Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table] Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table] Debt Instrument [Axis] Debt Instrument [Axis] Share-Based Payment Arrangement [Abstract] Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Unrecognized compensation cost related to nonvested RSAs Debt Securities, Available-for-Sale [Abstract] Available for Sale Sale of Stock [Axis] Sale of Stock [Axis] Banking Regulation, Regulatory Capital Requirement, Compliance [Table] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Employee Stock Ownership Plan (ESOP), Debt Structure, Direct Loan, Amount ESOP loan Net Cash Provided by (Used in) Investing Activities Net cash (used in) provided by investing activities Private Placement [Member] Private Placement Minimum Requirement Phase-In Schedule Minimum Requirement Phase-In Schedule [Abstract] Minimum Required to be Well Capitalized Pass [Member] Pass Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Forfeited (in dollars per share) Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five After one through five years Preferred Units, Authorized Preferred stock, authorized (in shares) Allowance for Credit Losses [Text Block] Allowance for Credit Losses Consumer loans Consumer And Other Loans Consumer And Other Loans [Member] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Consolidated Entities [Axis] Consolidated Entities [Axis] Interest Expense, Short-Term Borrowings Short-term borrowings Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five After one 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[Member] Maximum Statistical Measurement [Axis] Statistical Measurement [Axis] Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year Financing receivable, year three, originated, two years before current fiscal year Common Stock, Value, Issued Common Stock, par value $1.00 per share 100,000,000 authorized; 11,679,489 and 11,678,902 issued and outstanding at March 31, 2026 and December 31, 2025, respectively Realized losses on the sale of securities Loss on Sale of Investments Loss on sale of securities, net Loss on sale of securities, net Net Income (Loss) Available to Common Stockholders, Diluted Net income available to common shareholders Net income available to common shareholders - diluted Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Consolidation, Policy [Policy Text Block] Consolidation Equipment [Member] Equipment Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Other comprehensive income (loss), net of tax: Preferred Stock Dividends, Income Statement Impact Preferred stock dividends Bank Owned Life Insurance Income Earnings on bank-owned life insurance Increase (Decrease) in Accounts Receivable and Other Operating Assets Accrued interest receivable and other assets Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year Financing receivable, year one, originated current fiscal year Preferred Stock, Shares Authorized Preferred stock, shares authorized (in shares) Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 After ten years Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Unrealized losses, total Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value Allocated and single maturity date, total Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Financing Receivable, Allowance for Credit Loss, Individually Evaluated Individually evaluated loans Entity Registrant Name Entity Registrant Name Debt Disclosure [Text Block] Trust Preferred Securities Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Gross Unrealized Losses Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount Total Spot yield period Spot Yield Period Spot yield period. Additional Paid in Capital Additional paid-in capital Consolidated Entities [Domain] Consolidated Entities [Domain] Income tax expense Income Tax Expense (Benefit) Measurement Frequency [Axis] Measurement Frequency [Axis] Proceeds from Issuance of Common Stock Issuance of common stock Net Change Noninterest-Bearing Deposits, Domestic Noninterest-bearing deposits Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Proceeds from Life Insurance Policy Proceeds from bank-owned life insurance Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding US States and Political Subdivisions Debt Securities [Member] State and local political subdivisions States and political subdivisions Disposal Group Classification [Axis] Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss, net Commercial Real Estate Portfolio Segment [Member] Commercial Real Estate Payments of FHLBank Borrowings, Financing Activities Payments on Federal Home Loan Bank advances Payments to Acquire Property, Plant, and Equipment Purchases of premises and equipment Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Granted (in shares) Assets Total assets Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Income Statement [Abstract] BancPlus Statutory Trust II BancPlus Statutory Trust II [Member] BancPlus Statutory Trust II Debt Instrument, Redemption, Period One [Member] From and including June 4, 2020, to but excluding June 15, 2025 or early redemption date Deferred Income Tax Expense (Benefit) Deferred income tax expense (benefit) Sale of Stock, Number of Shares Issued in Transaction Shares issued in sale (in shares) Gain (Loss) on Sales of Loans, Net Gain on loans held for sale Gain (Loss) on Sales of Loans, Net, Total Net gain Stock Issued During Period, Shares, New Issues Issuance of Company Stock Construction [Member] Construction and land development Banking Regulation, Tier 1 Leverage Capital, Capital Adequacy, Minimum Tier 1 Capital to Average Assets Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Vested (in shares) Earnings Per Share, Diluted Earnings per common share - diluted (in dollars per share) Diluted earnings per common share (in dollars per share) City Area Code City Area Code Financing Receivable, Credit Loss, Expense (Reversal) (Recovery of) provision for credit losses on unfunded loan commitments Provision for loan losses Provision for credit losses Deposits Deposits Employee Stock Ownership Plan, Employer Matching Contribution, Percent of Match Employee Stock Ownership Plan, Employer Matching Contribution, Percent of Match Employer matching contribution, percent of match (as a percentage) Payments for (Proceeds from) Loans Receivable Net (increase) decrease in loans Debt Instrument, Face Amount Face amount of debt issued and sold Financial Asset, Past Due [Member] Total Past Due Preferred Stock, Dividend Rate, Period Of Review For Rate Percentage, After Year Ten, End Of Period Preferred Stock, Dividend Rate, Period Of Review For Rate Percentage, After Year Ten, End Of Period Review lookback period after year 10, end of period Repurchase option description Repurchase Option Description Repurchase option description. Equity Risk Premium Percentage Equity risk premium percentage. Equity risk premium percentage Interest and Fee Income, Loans and Leases Interest and fees on loans Debt Instrument Redemption Amount Debt instrument redemption amount. Debt instrument redemption amount Loan, Held-for-Sale, Fair Value Disclosure Loans held for sale Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities Aggregate obligation assumed in conjunction with FTC merger Property, Plant and Equipment, Net Premises and equipment, net First Trust Corporation ("FTC") Merger Agreement First Trust Corporation ("FTC") Merger Agreement [Member] First Trust Corporation ("FTC") Merger Agreement Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Issuance of restricted stock, net of forfeitures Period of no dividends paid (in years) Payments of Ordinary Dividends, Preferred Stock Or Preference Stock, Contractual Period Of No Dividend Payments After Issuance Payments of Ordinary Dividends, Preferred Stock Or Preference Stock, Contractual Period Of No Dividend Payments After Issuance Retained Earnings [Member] Retained Earnings Collateral Held, Other Collateral Held, Other [Member] Other Financial Liabilities, Fair Value, Level 2 Inputs Financial Liabilities, Fair Value, Level 2 Inputs [Abstract] Level 2 inputs: Share-Based Payment Arrangement, Noncash Expense Stock based compensation expense Federal Funds Sold Federal funds sold Noninterest Income, Other Operating Income Total noninterest income Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Fair value, less than 12 months Fair Value, Inputs, Level 1 [Member] Level 1 Class of Stock [Line Items] Class of Stock [Line Items] Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities Collateral Held [Domain] Collateral Held [Domain] Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 After five through ten years Transfers from loans held for sale to loans Loan, Transfer from Held-for-Sale to Held-in-Portfolio Corporate Debt Securities [Member] Corporate investments Financing Receivable, Modified [Line Items] Financing Receivable, Troubled Debt Restructuring [Line Items] Debt Securities, Available-for-Sale [Table] Debt Securities, Available-for-sale [Table] Entity Interactive Data Current Entity Interactive Data Current Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year Financing receivable, year two, originated, fiscal year before current fiscal year Fair Value Measurement [Domain] Fair Value Measurement [Domain] Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Branch Sale [Policy Text Block] Branch sale. Branch Sale Level 1 inputs: Financial Assets, Fair Value, Level 1 inputs Financial Assets, Fair Value, Level 1 inputs [Abstract] Redeemable Noncontrolling Interest, Equity, Common Stock Owned by ESOP, Fair Value Redeemable Noncontrolling Interest, Equity, Common Stock Owned by ESOP, Fair Value Less: Redeemable common stock owned by the ESOP Financing Receivable [Policy Text Block] Loans and Allowance for Credit Losses Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Accretion (Amortization) of Discounts and Premiums, Investments Net accretion of securities Impaired Loans, Net Of Allowance For Loan Losses, Measurement Input Impaired Loans, Net Of Allowance For Loan Losses, Measurement Input Collateral-dependent loans, net of specific allowance for credit losses, measurement input (as a percentage) Banking Regulation, Total Capital, Actual Banking regulation, maximum capital amount Common stock dividends Common Stock, Dividends, Per Share, Declared Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] Entity Tax Identification Number Entity Tax Identification Number Long-Term Debt, Type [Axis] Long-term Debt, Type [Axis] Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Maturities and calls of securities available for sale Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss, Enterprise Value Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss, Enterprise Value Enterprise Value Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Basis of Presentation Occupancy, Net Net occupancy expenses Debt Securities, Held-to-Maturity, Maturity [Abstract] Held to maturity: Preferred Stock, Dividend Rate, After Year Two, Percentage Preferred Stock, Dividend Rate, After Year Two, Percentage Dividend rate after initial two years Interest Income, Other Interest bearing bank balances and other Local Phone Number Local Phone Number Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance Loans held for sale Measurement Input, Cost to Sell [Member] Selling costs Assets transferred to buyer in branch sale Consideration Received for Beneficial Interest Obtained for Transferring Financial Asset Stock Withheld To Satisfy Vesting Of Restricted Stock Obligation During Period, Value Stock Withheld To Satisfy Vesting Of Restricted Stock Obligation During Period, Value Shares withheld to satisfy withholding obligation in the vesting of restricted stock Noninterest Expense Total noninterest expense Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Federal Home Loan Bank And Other Borrowings, Fair Value Disclosure Federal Home Loan Bank And Other Borrowings, Fair Value Disclosure FHLB and other borrowings Residential Portfolio Segment [Member] Residential Residential real estate: Class of Stock [Domain] Class of Stock [Domain] S&P BBB Plus, BBB, BBB minus / Moody's Baa, Ba, B S&P BBB Plus, BBB, BBB minus / Moody's Baa, Ba, B [Member] S&P: BBB+, BBB, BBB- / Moody's: Baa, Ba, B Labor and Related Expense Salaries and employee benefits expenses Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Unrecognized compensation cost related to nonvested RSAs, period for recognition (in years) Stock, Class of Stock [Table] Schedule of Stock by Class [Table] Entity Emerging Growth Company Entity Emerging Growth Company