Exercisable (in dollars per share) Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option, Exercisable, Weighted Average Exercise Price Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option, Exercisable, Weighted Average Exercise Price Due in 2025 Short-Term Debt, Maturity, Remainder of Fiscal Year Short-Term Debt, Maturity, Remainder of Fiscal Year Revision of Prior Period [Axis] Revision of Prior Period [Axis] Schedule of Debt Securities, Available-for-Sale Debt Securities, Available-for-Sale [Table Text Block] Schedule of Contractual Maturities Schedule of Short-Term Debt [Table Text Block] Subordinated debentures and trust preferred securities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures And Trust Preferred Securities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures And Trust Preferred Securities Subordinated debentures owed to unconsolidated subsidiary trusts Subordinated Debt Owed To Unconsolidated Subsidiary Trusts [Member] Subordinated Debt Owed To Unconsolidated Subsidiary Trusts Award Timing Predetermined Award Timing Predetermined [Flag] Cash paid for fractional shares Business Combination , Cash Paid For Fractional Shares Business Combination , Cash Paid For Fractional Shares Deposits Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits Entity File Number Entity File Number Additional Paid-in Capital Additional Paid-in Capital [Member] Goodwill and intangibles Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Goodwill And Intangible Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Goodwill And Intangible Assets Reclassification adjustment for loss (gain) on securities, net of tax of $9 and $129 for the three months ended June 30, 2025, and June 30, 2024, respectively, net of tax of $9 and $129 for the six months ended June 30, 2025, and June 30, 2024, respectively Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Tabular List, Table Tabular List [Table Text Block] Expected Burke & Herbert common stock to be issued (in shares) Business Acquisition, Expected Equity Interest Issued or Issuable, Number of Shares Business Acquisition, Expected Equity Interest Issued or Issuable, Number of Shares Time deposits, individual retirement account Interest-Bearing Domestic Deposit, Other Time Deposit Newly issued not yet adopted accounting standards New Accounting Pronouncements, Policy [Policy Text Block] Finance Leases Finance Lease, Liability [Abstract] Other Other Expenses Measurement Basis [Axis] Measurement Basis [Axis] Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Recoveries Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery Shares purchased (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Minimum Required Capital - Basel III Ratio (as a percent) Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] Adjustment to Compensation, Amount Adjustment to Compensation Amount Summit Financial Group, Inc Summit Financial Group, Inc [Member] Summit Financial Group, Inc (Increase) in other assets Increase (Decrease) in Other Operating Assets Nature of Operations and Consolidation Consolidation, Policy [Policy Text Block] Share-based compensation expense Compensation expense recognized (in 000's) Share-Based Payment Arrangement, Noncash Expense Performance-based Restricted Stock Units Performance-based Restricted Stock Units [Member] Performance-based Restricted Stock Units Employee Stock Option Share-Based Payment Arrangement, Option [Member] Income taxes Income Taxes Paid Common stock cash dividends, declared Dividends, Common Stock, Cash Unrealized holding gain (loss) on cash flow hedge, tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Total Shareholders’ Equity Beginning Balance Ending Balance Equity, Attributable to Parent Measurement Frequency [Axis] Measurement Frequency [Axis] Insider Trading Policies and Procedures [Line Items] Common stock, authorized (in shares) Common Stock, Shares Authorized Financial assets Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Recurring Fair Value, Recurring [Member] Minimum Required to be Well Capitalized Amount Banking Regulation, Tier 1 Leverage Capital, Well Capitalized, Minimum Liabilities and Shareholders’ Equity Liabilities and Equity [Abstract] Minimum Required to be Well Capitalized Amount Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Well Capitalized, Minimum Cover [Abstract] Interest-earning deposits with banks Cash and Cash Equivalents, Fair Value Disclosure Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Maximum Maximum [Member] Loans transferred to other real estate owned Real Estate Owned, Transfer to Real Estate Owned Useful lives (in years) Finite-Lived Intangible Asset, Useful Life Beginning of period Total core deposit intangible Total core deposit intangible Finite-Lived Intangible Assets, Net After Ten Years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Minimum Required to be Well Capitalized 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] Debt Instrument [Line Items] Sales of real estate owned Other Real Estate, Disposals Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Accrued interest and other liabilities Interest Payable And Other Liabilities Interest Payable And Other Liabilities Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Other assets Other Assets [Member] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Income (loss) before income taxes 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 Finance lease cost Income and Expenses, Lessee [Abstract] Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Statement of Stockholders' Equity [Abstract] Unrealized holding gain (loss) on cash flow hedge, net of tax of ($202) and ($238) for the three months ended June 30, 2025, and June 30, 2024, respectively, net of tax of ($91) and ($945) for the six months ended June 30, 2025, and June 30, 2024, respectively Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Total interest expense Interest expense Interest Expense, Operating Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Commercial letters of credit Letter of Credit [Member] Outstanding amount for short-term debt Short-Term Debt, Average Outstanding Amount Reclassification adjustment for loss (gain) on fair value hedge, net of tax of $9 and $9 for the three months ended June 30, 2025, and June 30, 2024, respectively, net of tax of $19 and $17 for the six months ended June 30, 2025, and June 30, 2024, respectively Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, after Tax Interest expense Finance Lease, Interest Expense Related Allowance Financing Receivable, Allowance for Credit Loss, Individually Evaluated Interest paid to depositors Interest Paid, Deposits Interest Paid, Deposits Document Fiscal Period Focus Document Fiscal Period Focus Residential mortgage backed - agency Residential Mortgage-Backed Securities - Agency [Member] Residential Mortgage-Backed Securities - Agency Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Award Timing Method Award Timing Method [Text Block] Amortized Cost Amortized cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss Weighted Average Exercise Price Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Nonvested, Weighted Average Exercie Price [Abstract] Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Nonvested, Weighted Average Exercie Price Award Type [Axis] Award Type [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] SFG capital trust issued Proceeds from Issuance of Mandatory Redeemable Capital Securities Consolidated Parent Company [Member] Investment, Name [Domain] Investment, Name [Domain] Trading Symbol Trading Symbol 2029 Lessee, Operating Lease, Liability, to be Paid, Year Four Tax-exempt securities Interest Income, Securities, Operating, Tax Exempt Entity Address, City or Town Entity Address, City or Town Finance lease weighted average discount rate (as a percent) Finance Lease, Weighted Average Discount Rate, Percent Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Change in fair value of loans held-for-sale Gain (Loss) On Loans Held-For-Sale, Fair Value Adjustment Gain (Loss) On Loans Held-For-Sale, Fair Value Adjustment Amortization of other intangible assets Amortization Of Intangible Assets And Right-of-Use Assets Amortization Of Intangible Assets And Right-of-Use Assets Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Income Statement Location [Domain] Statement of Income Location, Balance [Domain] 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] Fully diluted transaction value Total purchase price consideration Business Combination, Consideration Transferred Short-term borrowings Interest Expense, Short-Term Borrowings Entity Emerging Growth Company Entity Emerging Growth Company 2028 Long-Term Debt, Maturity, Year Three Actual Ratio (as a percent) Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Actual Finance lease weighted average remaining lease term (in years) Finance Lease, Weighted Average Remaining Lease Term 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] Unfunded Loan Commitment Unfunded Loan Commitment [Member] Non-interest-bearing deposits Non-Interest Bearing [Member] Non-Interest Bearing Total non-interest income Noninterest Income Less: discount Finance Lease, Liability, Undiscounted Excess Amount Common stock, outstanding (in shares) Beginning Balance (in shares) Ending Balance (in shares) Common Stock, Shares, Outstanding Remaining six months ending, December 31, 2025 Lessor, Operating Lease, Payment to be Received, Remainder of Fiscal Year Defined benefit pension plans: Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent [Abstract] (Gain) on loans held-for-sale Gain (Loss) on Sales of Loans, Net Capital expenditures Other Real Estate, Improvements Loans Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Non-interest expense Noninterest Expense [Abstract] Cash and due from banks Cash and due from banks Cash and Due from Banks Legal expense Legal Fees Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] 90 Days Past Due or More & Still Accruing Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing Shares issued during period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period Securities, held-to-maturity, at amortized cost Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Debt Securities, Held To Maturity, At Amortized Cost Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Debt Securities, Held To Maturity, At Amortized Cost Owner-occupied commercial real estate Owner-Occupied Commercial Real Estate [Member] Owner-Occupied Commercial Real Estate Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Tax-exempt loans, including fees Interest And Fee Income, Loans And Leases, Tax Exempt Interest And Fee Income, Loans And Leases, Tax Exempt 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 (benefit) Income tax expense (benefit) Income Tax Expense (Benefit) Loans, net of allowance Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financing Receivable, Excluding Accrued Interest, After Allowance For Credit Loss Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financing Receivable, Excluding Accrued Interest, After Allowance For Credit Loss Basis points Debt Instrument, Basis Spread on Variable Rate Interest bearing deposit, certificates of deposits Interest-Bearing Domestic Deposit, Certificates of Deposits Other assets Other Assets Preferred stock, issued (in shares) Preferred Stock, Shares Issued Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Derivatives designated as hedges: Designated as Hedging Instrument [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Hedging Relationship [Axis] Hedging Relationship [Axis] Allowance established for acquired PCD loans Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Loan Purchased Schedule of Stock Appreciation Rights and Option Activity Share-Based Payment Arrangement, Option and Stock Appreciation Rights, Activity [Table Text Block] Purchase price of loans at acquisition Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price Other Income and Expenses [Abstract] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Tier 1 (Core) Capital to risk weighted assets Banking Regulation, Tier 1 Risk-Based Capital [Abstract] Acquired goodwill Preliminary goodwill Goodwill, Acquired During Period Cash (paid) from merger, net Payments to Acquire Businesses, Net of Cash Acquired Commitments to extend credit Unused lines of Credit [Member] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Preferred stock dividends Preferred Stock Dividends, Income Statement Impact Other non-interest income Noninterest Income, Other Operating Income Beginning nonvested (in shares) Ending nonvested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Commitments and Contingencies Disclosure [Abstract] Amortized Cost, With No Related Allowance Financing Receivable, Individually Evaluated, without Allowance for Credit Loss Net cash flows provided by (used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Securities, held-to-maturity, at amortized cost Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Debt Securities, Held To Maturity, At Amortized Cost Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Debt Securities, Held To Maturity, At Amortized Cost Debt instrument, term (in years) Debt Instrument, Term Financial instrument contractual amount Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Liability Proceeds from sale of securities available-for-sale, net Proceeds from sales Proceeds from Sale of Debt Securities, Available-for-Sale Securities available-for-sale, at fair value Estimated fair values Fair Value Fair Value Debt Securities, Available-for-Sale, Excluding Accrued Interest Proceeds from sale of OREO property Proceeds from Sale of Other Real Estate Preferred stock, par value per share (in dollars per share) Preferred Stock, Par or Stated Value Per Share 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] 2029 Finance Lease, Liability, to be Paid, Year Four Remaining six months ending, December 31, 2025 Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Derivative liability, fair value Derivative Liability, Subject to Master Netting Arrangement, before Offset Equity Components [Axis] Equity Components [Axis] Entity Ex Transition Period Entity Ex Transition Period Year Four Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Reclassification adjustment for loss (gain) on securities, tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Number of reportable segments Number of Reportable Segments Amortization of debt discount (premium) Debt Instrument, Unamortized Discount (Premium), Net Entity Address, State or Province Entity Address, State or Province Substandard Substandard [Member] Repayment of finance lease liabilities Financing cash flows from finance leases Finance Lease, Principal Payments Special Mention Special Mention [Member] Financial Asset, Aging [Domain] Financial Asset, Aging [Domain] Loans, net Loans Receivable, Fair Value Disclosure Individual: Individual [Axis] Operating Leases Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity [Abstract] Right-of-use assets obtained in exchange for new finance lease liabilities Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Premises and equipment, net Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment Estimated Fair Value Adjustments Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Entity Interactive Data Current Entity Interactive Data Current Year to date gross charge-offs Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] Realized (gain) loss on sales of OREO property Gains (Losses) on Sales of Other Real Estate Interest income Interest and Dividend Income, Operating [Abstract] Subordinated Debentures, Issued In Third Quarter Of 2020 Subordinated Debentures, Issued In Third Quarter Of 2020 [Member] Subordinated Debentures, Issued In Third Quarter Of 2020 Total non-interest expense Noninterest Expense Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) [Abstract] Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) [Abstract] Allowance for Credit Losses Allowance for Credit Losses [Text Block] Deposits Interest Expense, Deposits 2019 Stock Incentive Plan 2019 Stock Incentive Plan [Member] 2019 Stock Incentive Plan Non-interest income Noninterest Income [Abstract] Ownership [Domain] Ownership [Domain] 2027 Finance Lease, Liability, to be Paid, Year Two Schedule of Remaining Maturities of Operating Lease Receivables Lessor, Operating Lease, Payment to be Received, Maturity [Table Text Block] Entity Central Index Key Entity Central Index Key PEO Name PEO Name Schedule of Remaining Maturities of Subordinated Debentures Schedule of Maturities of Long-Term Debt [Table Text Block] Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Supplemental Disclosures of Cash Flow Information Supplemental Cash Flow Elements [Abstract] Schedule of Financing Receivable Credit Quality Indicators Financing Receivable Credit Quality Indicators [Table Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Other comprehensive income (loss), net of tax: Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Minimum Required Capital - Basel III Amount Banking Regulation, Tier 1 Leverage Capital, Capital Adequacy, Minimum Non-interest-bearing deposits Noninterest-Bearing Deposit Liabilities Schedule of Other Operating Expense Schedule of Other Operating Cost and Expense, by Component [Table Text Block] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Unrecognized compensation costs Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Equity and other investments Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Equity And Other Investments Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Equity And Other Investments Net (decrease) in interest-bearing accounts Net Change Interest-Bearing Deposits, Domestic Interest paid on short-term borrowings Interest Paid, Short-Term Borrowings Interest Paid, Short-Term Borrowings 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Three Balance Sheet Location [Axis] Statement of Financial Position Location, Balance [Axis] Interest-earning deposits with banks Bank Time Deposits [Member] 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 Comprehensive Income (Loss) Accumulated Other Comprehensive Income AOCI Attributable to Parent [Member] Forfeited Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option, Aggregate Intrinsic Value, Forfeited Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option, Aggregate Intrinsic Value, Forfeited Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Fair value of liabilities Fair Value Hedge Liabilities Ownership [Axis] Ownership [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Derivatives Derivative Instruments and Hedging Activities Disclosure [Text Block] Retained earnings available to be declared as dividend Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval Schedule of Purchased Credit Deteriorated Loans Financing Receivable, Purchased With Credit Deterioration [Table Text Block] Financing Receivable, Purchased With Credit Deterioration Other liabilities Other Liabilities [Member] Fair Value as of Grant Date Award Grant Date Fair Value Reclassification adjustment for losses (gains) included in net income, tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax Proceeds from principal payments Proceeds From Principal Payments Of Available-For-Sale Debt Securities Proceeds From Principal Payments Of Available-For-Sale Debt Securities Increase in accrued interest payable and other liabilities Increase (Decrease) In Interest Payable And Other Liabilities Increase (Decrease) In Interest Payable And Other Liabilities Year Five Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year Pensions and other employee benefits Employee Benefits and Share-Based Compensation Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Options effect of dilutive shares (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Expected common stock volatility (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Minimum Required Capital - Basel III Ratio (as a percent) Banking Regulation, Tier 1 Leverage Capital Ratio, Capital Adequacy, Minimum Lease liabilities: Operating and Finance Lease, Liability [Abstract] Operating and Finance Lease, Liability Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Document Quarterly Report Document Quarterly Report Less Than Twelve 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 from company-owned life insurance Income from company-owned life insurance Bank Owned Life Insurance Income Debt instrument, fair value Long-Term Debt, Fair Value Schedule of Fair Value Measurement Inputs and Valuation Techniques Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Counterparty Name [Domain] Counterparty Name [Domain] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] 2027 Lessee, Operating Lease, Liability, to be Paid, Year Two Commercial mortgage backed - agency Commercial Mortgage-Backed Securities - Agency [Member] Commercial Mortgage-Backed Securities - Agency Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount 2019 SAR SAR 2019 Plan [Member] SAR 2019 Plan Impairment existed based on a combination of factors Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal) Non-PEO NEO Non-PEO NEO [Member] Amount of gain or (loss) reclassified from AOCI into income as a result that a forecasted transaction is no longer probable of occurring Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, before Tax Preferred stock, fixed rate (as a percent) Preferred Stock, Dividend Rate, Percentage Other interest income Interest Income, Other Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Lease liability arising from obtaining right-of-use assets Right-of-Use Asset Obtained in Exchange for Operating and Finance Lease Liability Right-of-Use Asset Obtained in Exchange for Operating and Finance Lease Liability Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Award Type [Domain] Award Type [Domain] Amount of Gain or (Loss) Recognized in OCI Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 2026 Lessee, Operating Lease, Liability, to be Paid, Year One Outstanding (in dollars per share) Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option, Outstanding, Weighted Average Exercise Price Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option, Outstanding, Weighted Average Exercise Price Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Compensation Amount Outstanding Recovery Compensation Amount Minimum Required to be Well Capitalized Amount Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Expected dividend yield (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Minimum Required Capital - Basel III Ratio (as a percent) Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy With Buffer, Minimum Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy With Buffer, Minimum Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Fair Value Amount Estimate of Fair Value Measurement [Member] Outstanding (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option, Outstanding, Weighted Average Remaining Contractual Terms Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option, Outstanding, Weighted Average Remaining Contractual Terms MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] One to Five Years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Subordinated Debentures, Issued In Fourth Quarter Of 2021 Subordinated Debentures, Issued In Fourth Quarter Of 2021 [Member] Subordinated Debentures, Issued In Fourth Quarter Of 2021 Unrealized gains (losses) on securities: Debt Securities, Unrealized Gain (Loss) [Abstract] Employee Stock Employee Stock [Member] Remaining six months ending, December 31, 2025 Finance Lease, Liability, to be Paid, Remainder of Fiscal Year 2029 Time Deposit Maturities, Year Four Five to Ten Years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax 2026 Long-Term Debt, Maturity, Year One Financial Instruments [Domain] Financial Instruments [Domain] Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Securities and loans pledged Federal Home Loan Bank and Unsecured Federal Funds, Advances, General Debt Obligations, Disclosures, Collateral Pledged Federal Home Loan Bank and Unsecured Federal Funds, Advances, General Debt Obligations, Disclosures, Collateral Pledged Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Purchases of restricted stock Payments to Acquire Restricted Investments Reclassification adjustment for losses (gains) included in net income, net of tax $168 and $183 for the three months ended June 30, 2025, and June 30, 2024, respectively, net of tax of $266 and $89 for the six months ended June 30, 2025, and June 30, 2024, respectively Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Tier 2 capital reduction (as a percent) Banking Regulation, Tier 2 Risk-Based Capital, Annual Reduction In Qualifying Amount, Percentage Banking Regulation, Tier 2 Risk-Based Capital, Annual Reduction In Qualifying Amount, Percentage Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Banking Regulation, Regulatory Capital Requirement, Compliance [Table] SFG Capital Trust I SFG Capital Trust I [Member] SFG Capital Trust I Minimum Minimum [Member] Net interest income after credit loss expense Interest Income (Expense), after Provision for Loan Loss Adjustment to goodwill acquired in conjunction with the acquisition of Summit Goodwill adjustment Goodwill, Measurement Period Adjustment Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Company Selected Measure Name Company Selected Measure Name Fair Value Measurement [Domain] Fair Value Measurement [Domain] Schedule of Contractual Amounts of Company’s Financial Instruments Outstanding Schedule of Fair Value, off-Balance-Sheet Risks [Table Text Block] Minimum 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