Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Derivative financial assets Offsetting Derivative Assets [Abstract] Title of 12(b) Security Title of 12(b) Security Aggregate unpaid principal balance Carrying amount Reported Value Measurement [Member] Schedule of Available-for-sale Securities [Table] Debt Securities, Available-for-Sale [Table] Increase (decrease) in rebooked GNMA loans under optional repurchase program Increase (Decrease) In Loans Assumed, Net Increase (Decrease) In Loans Assumed, Net (Accretion) amortization of discounts and premiums on acquired loans, net Certain Loans Acquired In Transfer Not Accounted For As Debt Securities, Accretable Yield Accretion (Amortization) Certain Loans Acquired In Transfer Not Accounted For As Debt Securities, Accretable Yield Accretion (Amortization) Schedule of Balances and Levels of Assets Measured at Fair Value on Non-recurring Basis and Changes in Fair Value Associated Fair Value Measurements, Nonrecurring [Table Text Block] Adjustment to Compensation, Amount Adjustment to Compensation Amount Actual, ratio Banking Regulation, Total Risk-Based Capital Ratio, Actual Nonaccrual with no related allowance Financing Receivable, Nonaccrual, No Allowance Financial Instrument [Axis] Financial Instrument [Axis] Segment Reporting [Abstract] Segment Reporting [Abstract] State taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Leases Lessee, Finance Leases [Text Block] Derivative Instrument [Axis] Derivative Instrument [Axis] Mortgage servicing rights Servicing Asset at Fair Value, Amount Measurement Frequency Measurement Frequency [Axis] Accrued interest receivable on loans Financing Receivable, Accrued Interest, before Allowance for Credit Loss U.S. government agency securities US Treasury and Government [Member] Schedule of Other Real Estate Owned Schedule Of Other Real Estate Owned Table [Table Text Block] Schedule of other real estate owned. Consolidated Entities [Axis] Consolidated Entities [Axis] Gain on lease terminations Gain (Loss) on Termination of Lease Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Financial Instrument Performance Status [Domain] Financial Instrument Performance Status [Domain] Loans purchased credit-deteriorated fair value Financing Receivable, Purchased with Credit Deterioration, Amount at Par Value Benefit from stock-based compensation Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Amount Percentage increase (decrease) resulting from: Effective Income Tax Rate Reconciliation, Percent [Abstract] Premises and equipment Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Customer time deposits Customer Time Deposits Customer time deposits. Leases [Abstract] Leases [Abstract] PSUs outstanding (in shares) Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance Schedule of Actual and Required Capital Amounts and Ratios Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Actual, amount Banking Regulation, Tier 1 Risk-Based Capital, Actual Consolidated Entities [Domain] Consolidated Entities [Domain] Related Party Transactions Related Party Transactions Disclosure [Text Block] Maximum number of shares per participant (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Number of Shares Per Employee Noncontrolling interest distribution Payments to Noncontrolling Interests Current and prior-period gross charge-offs, prior Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff Gross Unrealized Loss , Total Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Proceeds from the sale of other real estate owned Proceeds from Sale of Other Real Estate Prior Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Gain (loss) on sale of other real estate owned Gain (Loss) On Sale Of Foreclosed Real Estate Assets. Gain (Loss) On Sale Of Foreclosed Real Estate Assets. Balance at beginning of period (in shares) Balance at end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Tranche One Share-Based Payment Arrangement, Tranche One [Member] Schedule of Amortized Cost of FDM Loans and Financial Effects of Loan Modifications Financing Receivable, Modified [Table Text Block] Accretion of premiums and discounts on securities, net Accretion (Amortization) of Discounts and Premiums, Investments Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Arrangements and Non-arrangement Transactions Collaborative Arrangement and Arrangement Other than Collaborative [Domain] First National Banker's Bankshares, Inc. stock First National Banker's Bankshares, Inc. Stock [Member] First National Banker's Bankshares, Inc. Stock Number of reporting segments Number of Reportable Segments Dividend equivalent payments made upon vesting of equity compensation Payments Made Upon Vesting Of Dividend Equivalent Units Payments Made Upon Vesting Of Dividend Equivalent Units FHLB Cincinnati Federal Home Loan Bank of Cincinnati [Member] Mortgage servicing rights, at fair value Carrying value at beginning of period Carrying value at end of period Servicing Asset at Amortized Cost Schedule of Non-Designated Derivative Financial Instruments Schedule of Derivative Instruments [Table Text Block] Amortized cost Amortized cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss Subsequent events Subsequent Events, Policy [Policy Text Block] Entity Address, City or Town Entity Address, City or Town Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Class of Financing Receivable, Type Class of Financing Receivable [Domain] Receivables [Abstract] Receivables [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Relationship to Entity Title and Position [Domain] Current and prior-period gross charge-offs, 2026-2025 Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff Core deposit and other intangibles, net Intangible Asset, Finite-Lived, after Accumulated Amortization Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Federal Home Loan Bank Branch [Axis] Federal Home Loan Bank Branch [Axis] Discount rate Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate June 30, 2030 Finance Lease, Liability, to be Paid, Rolling Year Four Proceeds from employee payroll withholdings Proceeds from Stock Plans Significant other observable inputs (level 2) Level 2 Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Total other comprehensive (loss) income, net of tax Other comprehensive income (loss), net of taxes Other Comprehensive Income (Loss), Net of Tax Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] 2016-LTIP Plan Long Term Incentive Plan 2016 [Member] Long Term Incentive Plan 2016 Floating interest rate loan commitments Financing Receivable, Commitment with Variable Rate, Amount FB Financial Corporation Parent Company [Member] Due to change in valuation inputs or assumptions Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions Financial instruments Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset Financing Receivable, Related Parties [Roll Forward] Financing Receivable, before Allowance for Credit Loss [Roll Forward] Schedule of Segment Financial Information Segment Reporting [Table Text Block] Money market and savings Deposits, Savings Deposits Municipal securities Municipal Bonds [Member] Related Party Related and Nonrelated Parties [Axis] Tranche Four Share-Based Payment Arrangement, Tranche Four [Member] Share-Based Payment Arrangement, Tranche Four Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Banking Regulation, Regulatory Capital Requirement, Compliance [Table] Due in one to five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Schedule of Maturity Analysis of Operating Lease Liabilities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Less: allowance for credit losses on loans HFI Less: Allowance for credit losses on loans HFI Type of Collateral Balance at beginning of period Balance at end of period Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Document Period End Date Document Period End Date FirstBank Subsidiaries [Member] June 30, 2027 Finance Lease, Liability, to be Paid, Next Rolling 12 Months Basic earnings per common share: Earnings Per Share, Basic [Abstract] Gross realized losses Debt Securities, Available-for-Sale, Realized Loss Net unrealized gain in available-for-sale securities, net of tax expense OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Due in over ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Deterioration credit quality since origination, percentage Financing Receivable, Deterioration Credit Quality Since Origination Financing Receivable, Deterioration Credit Quality Since Origination Weighted average remaining lease term (in years) - finance Finance Lease, Weighted Average Remaining Lease Term Fair value of restricted stock units vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Accumulated other comprehensive loss, net Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Contractually Specified Servicing Fee Income, Statement of Income or Comprehensive Income [Extensible Enumeration] Contractually Specified Servicing Fee Income, Statement of Income or Comprehensive Income [Extensible Enumeration] % of total class of financing receivables Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage Mortgage Loans Mortgages [Member] Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] Provision for mortgage loan repurchases Provision For (Reversal of) Mortgage Loan Repurchases Or Indemnifications Provision for (reversal of) mortgage loan repurchase or indemnifications. Earnings per common share: Earnings Per Share [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Schedule of Changes in Mortgage Servicing Rights Servicing Asset at Amortized Cost [Table Text Block] Total securities Investment securities Debt Securities, Trading, and Equity Securities, FV-NI Total liabilities Liabilities Trading Symbol Trading Symbol Difference Changes Measurement [Member] Weighted average interest rate reduction Financing Receivable, Modified, Weighted-Average Interest Rate Decrease from Modification Available-for-sale debt securities, at fair value Fair Value Total AFS debt securities AFS debt securities: Debt Securities, Available-for-Sale, Excluding Accrued Interest Purchases of premises and equipment Payments to Acquire Property, Plant, and Equipment Performance adjustment (in dollars per share) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Adjustment, Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Adjustment, Weighted Average Grant Date Fair Value Transfers from loans held for sale to loans HFI Loan, Transfer from Held-for-Sale to Held-in-Portfolio Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Net increase in short-term FHLB advances Proceeds from FHLBank Borrowings, Financing Activities Schedule of Preliminary Fair Values of Assets Acquired and Liabilities Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] Company Selected Measure Name Company Selected Measure Name Purchases Payments to Acquire Debt Securities, Available-for-Sale Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount Deposits Interest Expense, Deposits Classified Criticized [Member] Diluted earnings per common share: Earnings Per Share, Diluted [Abstract] Financial Instrument Performance Status [Axis] Financial Instrument Performance Status [Axis] 2026-2025 Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Nonaccrual loans Financing Receivable, Nonaccrual Collateral securing line of credit Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Fair value of net assets acquired Net assets acquired Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Actual, amount Banking Regulation, Tier 1 Leverage Capital, Actual U.S. Treasury securities U.S. Treasury securities US Treasury Securities [Member] Type of Arrangement and Non-arrangement Transactions Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Financing Receivable, Troubled Debt Restructuring [Line Items] Financing Receivable, Modified [Line Items] Dividends declared not paid on restricted stock units and performance stock units Dividends declared not paid on restricted stock units and performance stock units Dividends Payable Award vesting, percentage Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Commitments to extend credit, excluding interest rate lock commitments Commitments to Extend Credit [Member] Lessee, operating and finance lease, renewal term Lessee, Operating And Finance Lease, Renewal Term Lessee, Operating And Finance Lease, Renewal Term Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward, Name [Domain] Less: imputed interest Finance Lease, Liability, Undiscounted Excess Amount State tax credits, net of federal benefit Income Tax Reconciliation Change In State Tax Credits, Net Of Federal Benefit, Percentage Income Tax Reconciliation Change In State Tax Credits, Net Of Federal Benefit, Percentage Commitments to lend additional funds Financing Receivable, Modified, Commitment to Lend Mortgage-backed securities Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost Loans held for sale under a fair value option Fair Value Option, Other Eligible Items [Member] Award Timing Predetermined Award Timing Predetermined [Flag] Provision for (reversal of) credit losses on unfunded commitments Financing Receivable, Provision For Credit Losses Financing Receivable, Provision For Credit Losses Thereafter Lessee, Operating Lease, Liability, to be Paid, after Rolling Year Five Interest income: Interest and Dividend Income, Operating [Abstract] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Quoted prices in active markets for identical assets (liabilities) (level 1) Level 1 Fair Value, Inputs, Level 1 [Member] Income tax expense, as reported Effective Income Tax Rate Reconciliation, Percent Fair value of financial instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Investment Securities Debt Securities, Available-for-Sale [Abstract] 1-to-4 family mortgage One To Four Family Mortgages [Member] Segment of the company's total financing receivables related to 1-4 family mortgages. Class of Financing Receivable, Type Class of Financing Receivable [Axis] Mortgage-backed securities - residential Residential Mortgage-Backed Securities [Member] Minimum requirement for capital adequacy with capital buffer, ratio Banking Regulation, Capital Conservation Buffer, Total Risk-Based Capital, Actual Subordinated debt, net Long-Term Debt, Fair Value Vesting [Domain] Vesting [Domain] Plan Name [Domain] Plan Name [Domain] Amortized cost, sub-total Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost Antidilutive Securities [Axis] Antidilutive Securities [Axis] Operating lease assets and liabilities, net Increase (Decrease) In Operating Leases Increase (Decrease) In Operating Leases Federal Home Loan Bank Branch [Domain] Federal Home Loan Bank Branch [Domain] Operating lease right-of-use assets Operating leases Operating Lease, Right-of-Use Asset Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Mortgage banking income Fees And Commissions Mortgage Banking Before Adjustments Fees and commissions mortgage banking before adjustments. Due in one year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Derivative Liability, Statement of Financial Position [Extensible Enumeration] Derivative Liability, Statement of Financial Position [Extensible Enumeration] Total purchase price Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Investment Securities Investment in Debt and Equity Securities and Other Trading Assets [Text Block] Dividends paid on common stock Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date Common equity tier 1 capital (to risk-weighted assets) Banking Regulation, Common Equity Tier 1 Risk-Based Capital [Abstract] Mortgage banking income Mortgage Banking [Member] State tax credits, net of federal benefit Income Tax Reconciliation Change In State Tax Credits, Net Of Federal Benefit Income Tax Reconciliation Change In State Tax Credits, Net Of Federal Benefit Cumulative Effect, Period of Adoption, Adjustment Cumulative Effect, Period of Adoption, Adjustment [Member] Servicing expenses Gross Servicing Expense Gross servicing expenses. Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Total equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Operating Leases Lessee, Operating Lease, Liability, to be Paid, Rolling Maturity [Abstract] Net change in fair value of mortgage servicing rights Change in fair value of mortgage servicing rights Change In Fair Value Of Mortgage Servicing Rights Change in fair value of mortgage servicing rights. Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Net proceeds from sale of common stock under employee stock purchase program Proceeds from Issuance of Common Stock Interest-bearing checking Interest-Bearing Deposit Liabilities Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Bank-owned life insurance Business Combination, Recognized Asset Acquired, Bank-Owned Life Insurance Business Combination, Recognized Asset Acquired, Bank-Owned Life Insurance Net (loss) income applicable to FB Financial Corporation Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax Segments [Domain] Segments [Domain] Schedule of Collateral-Dependent Loans Financing Receivable, Allowance For Credit Losses, Individually Assessed Allowance [Table Text Block] Financing Receivable, Allowance For Credit Losses, Individually Assessed Allowance [Table Text Block] Business Combination [Table] Business Combination [Table] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Loans held for sale (includes $165,511 and $172,974 at fair value, respectively) Loans held for sale at fair value Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance Minimum requirement for capital adequacy with capital buffer, ratio Banking Regulation, Capital Conservation Buffer, Common Equity Tier 1 Risk-Based Capital, Actual Combination Payment Deferral, Interest Rate Reduction, And Term Extension [Member] Payment Deferral, Interest Rate Reduction, And Term Extension Weighted average discount rate - finance Finance Lease, Weighted Average Discount Rate, Percent Dividends declared Dividends, Common Stock, Cash Total FB Financial Corporation common shareholders’ equity Equity, Attributable to Parent Interest on refunds Effective Income Tax Rate Reconciliation, Nondeductible Expense, Interest On Refunds, Amount Effective Income Tax Rate Reconciliation, Nondeductible Expense, Interest On Refunds, Amount Other assets Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent Due to payoffs/paydowns Servicing Asset At Fair Value Changes In Fair Value Due To Pay Offs Or Pay Downs Servicing asset at fair value, changes in fair value due to pay-offs or pay-downs. Section 162(m) limitation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Section 162(m) Limitation, Amount Income tax reconciliation nondeductible expense share based compensation cost. ASSETS Assets [Abstract] Amortized costs of collateral dependent loans Financing Receivable, Collateral Dependent Loans, Amortized Cost Financing Receivable, Collateral Dependent Loans, Amortized Cost Payment deferral Weighted average payment deferral (in months) Payment Deferral [Member] Allowance for credit losses at acquisition Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date Business acquisition, shares issued (in shares) Net shares issued (in shares) Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares Non-recurring Basis Fair Value, Nonrecurring [Member] Insider Trading Policies and Procedures [Line Items] Nonperforming Nonperforming Financial Instruments [Member] Performance-based restricted stock units vested, net of taxes PSUs Performance Shares [Member] Provision for deferred income taxes Deferred Income Tax Expense (Benefit) Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Tax Credit Carryforward [Axis] Tax Credit Carryforward [Axis] Commercial real estate: Commercial real estate: Commercial Real Estate Portfolio Segment [Member] Financing Receivable Portfolio Segment Financing Receivable Portfolio Segment [Domain] Borrowings Business Combination, Recognized Liability Assumed, Borrowings Business Combination, Recognized Liability Assumed, Borrowings Restricted stock units outstanding considered to be antidilutive (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Loans HFI provided for sales of other assets Noncash Transaction, Loans Provided For Sales Of Other Assets Noncash Transaction, Loans Provided For Sales Of Other Assets Entity Central Index Key Entity Central Index Key Net interest income after provision for credit losses Net interest income after provision for credit losses Interest Income (Expense), after Provision for Loan Loss Additional paid-in capital Additional Paid in Capital, Common Stock Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Federal taxes calculated at statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Without stated maturities Deposits Without Stated Maturities Fair Value Disclosure Deposits without stated maturities fair value disclosure. Minimum requirement for capital adequacy with capital buffer, amount Tier One Risk Based Minimum Capital Adequacy With Capital Buffer Tier one risk based minimum capital adequacy with capital buffer. Accrued interest receivable written off as an adjustment to interest income on non-accrual loans Financing Receivable, Accrued Interest, Writeoff Ownership [Axis] Ownership [Axis] Fair Value, Hierarchy Fair Value Hierarchy and NAV [Axis] Right-of-use asset - finance [Extensible Enumeration] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Principal balance Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price Increase (decrease) resulting from: Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Financing Receivable, Troubled Debt Restructuring [Table] Financing Receivable, Modified [Table] Restricted Stock Units Outstanding Performance Stock Units Outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Total undiscounted future minimum lease payments Finance Lease, Liability, to be Paid Accumulated other comprehensive (loss) income, net AOCI Attributable to Parent [Member] To qualify as well-capitalized under prompt corrective action provision, ratio Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum All Individuals All Individuals [Member] Performing Performing Financial Instruments [Member] Securities pledged Debt Securities, Available-for-Sale, Restricted Expected weighted-average period to be recognized Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Statement [Line Items] Statement [Line Items] Total assets Total assets Assets Term Extension Weighted average term extension (in months) Extended Maturity [Member] Total interest expense Interest expense Interest Expense, Operating Net loss on change in fair value and sale of equity securities Equity Securities, FV-NI And Sale Gain (Loss) Equity Securities, FV-NI And Sale Gain (Loss) Number of shares reserved for issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Internal Credit Assessment Internal Credit Assessment [Domain] Estimated impact on fair value of a 200 bp increase Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transfer Or Servicing Assets Or Liabilities Impact Of Two Percent Adverse Change In Discount Rate Sensitivity analysis of fair value of interests continued to be held by transferor servicing assets or liabilities impact of two percent adverse change in discount rate. Equity securities without a readily determinable market value (See Note 3) Equity Securities without Readily Determinable Fair Value, Amount Gross unrealized gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Total liabilities assumed Business Combination, Recognized Liability Assumed, Liability Stock-Based Compensation Share-Based Payment Arrangement [Text Block] Mortgage-backed securities Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value Occupancy and equipment expense Occupancy, Net PEO PEO [Member] Noninterest-bearing Noninterest-Bearing Deposit Liabilities Borrowings Debt, Long-Term and Short-Term, Combined Amount Total lease liabilities Lease Liability Lease Liability Goodwill Goodwill resulting from merger Goodwill Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Number of securities in securities portfolio, unrealized loss position Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Financing Receivable, Modified, Subsequent Default [Line Items] Financing Receivable, Modified, Subsequent Default [Line Items] Retained earnings Retained Earnings [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Schedule of Estimated Fair Values and Carrying Values of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Expiration of the statute of limitations Effective Income Tax Rate Reconciliation, Expiration Of Statute Of Limitations, Amount Effective Income Tax Rate Reconciliation, Expiration Of Statute Of Limitations, Amount Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Corporate securities Corporate Debt Securities [Member] Diluted (in dollars per share) Diluted earnings per common share (in dollars per share) Earnings Per Share, Diluted Internal Credit Assessment Internal Credit Assessment [Axis] Provision for (reversal of) credit losses on loans HFI Provision for credit losses on loans HFI Financing Receivable, Credit Loss, Expense (Reversal) Amortization of core deposit and other intangibles Amortization of intangibles Intangible Asset, Finite-Lived, Amortization Expense Ownership [Domain] Ownership [Domain] 2023-2022 Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year Capitalization Servicing Asset at Amortized Cost, Additions Schedule of Offsetting Assets Offsetting Assets [Table Text Block] Total assets Total assets Business Combination, Recognized Asset Acquired, Asset Equity method goodwill Equity Method Investment, Difference Between Carrying Amount and Underlying Equity Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] June 30, 2028 Lessee, Operating Lease, Liability, to be Paid, Rolling Year Two Mortgage Mortgage Segment [Member] Mortgage segment. Financial assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Repurchase of common stock Stock Repurchased During Period, Value Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Finance Lease Finance Lease, Liability, to be Paid, Rolling Maturity [Abstract] Business Combination, Pro Forma Information [Table] Business Combination, Pro Forma Information [Table] Service charges on deposit accounts Deposit Account [Member] Net amounts Derivative Liability, Including Not Subject to Master Netting Arrangement, after Offset and Deduction State taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Noninterest-bearing Business Combination, Recognized Liability Assumed, Non Interest Bearing Deposits Business combination recognized identifiable assets acquired and liabilities assumed, non-interest bearing deposits. Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent Other noninterest (loss) income Noninterest Income, Other Title of Individual Title and Position [Axis] Mortgage escrow deposits Escrow Deposit June 30, 2028 Finance Lease, Liability, to be Paid, Rolling Year Two Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Continuing Operation [Abstract] Total Derivative, Gain (Loss) on Derivative, Net Other real estate owned Other real estate owned, fair value Other Real Estate Total right-of-use assets Right-of-use Asset Right-of-use Asset Schedule of Maturity Analysis of Finance Lease Liabilities Finance Lease, Liability, to be Paid, Maturity [Table Text Block] Brokered and internet time deposits Brokered And Internet Time Deposits Brokered and internet time deposits. Loans Insured or Guaranteed by Government Authorities [Domain] Loans Insured or Guaranteed by Government Authorities [Domain] Mergers and Acquisitions Business Combination [Text Block] Collateral [Axis] Collateral Held [Axis] Interest on refunds Effective Income Tax Rate Reconciliation, Nondeductible Expense, Interest On Refunds, Percent Effective Income Tax Rate Reconciliation, Nondeductible Expense, Interest On Refunds, Percent Schedule of Servicing Income and Expense Included in Mortgage Banking Income Schedule Of Servicing Income And Expense Included In Mortgage Segment Table [Table Text Block] Schedule of servicing income and expense included in mortgage segment. Amortization of subordinated debt issuance costs and fair value premium, net Amortization Of Debt Issuance Costs And Accretion Of Premiums Amortization Of Debt Issuance Costs And Accretion Of Premiums Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] With stated maturities Deposits With Stated Maturities Fair Value Disclosure Deposits with stated maturities fair value disclosure. Net interest income Business Combination, Pro Forma Information, Pro Forma Interest Income, Net Business Combination, Pro Forma Information, Pro Forma Interest Income, Net Schedule of Changes in Performance Stock Units Schedule of Nonvested Performance-Based Units Activity [Table Text Block] Revolving Loans Amortized Cost Basis Financing Receivable, Excluding Accrued Interest, Revolving Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Schedule of Changes in Allowance for Credit Losses on Loans HFI by Class of Financing Receivable Financing Receivable, Allowance for Credit Loss [Table Text Block] Common stock, shares issued (in shares) Common Stock, Shares, Issued Forward commitments Forward Contracts [Member] Minimum requirement for capital adequacy with capital buffer, amount Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Capital Adequacy, Minimum Gross Unrealized Loss , 12 months or more Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Product and Service [Domain] Product and Service [Domain] (Loss) gain on sales or write-downs of premises and equipment, other real estate owned and other assets, net Net loss on write-downs of premises and equipment, other real estate owned and other assets Gains (Losses) on Sales of Other Real Estate Noninterest expenses: Noninterest Expense [Abstract] Collateral-dependent net loans held for investment, range of inputs Collateral Dependent Loans, Measurement Input Collateral Dependent Loans, Measurement Input Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Loans receivable, defaulted after modification in prior 12 months Financing Receivable, Modified, Subsequent Default Termination Date Trading Arrangement Termination Date Number of board seats, privately held entity Number Of Board Seats, Privately Held Entity Number Of Board Seats, Privately Held Entity Total principal amount of loans repurchased or indemnified Principal Amount Of Loans Repurchased Or Indemnified During Period Principal amount of loans repurchased or indemnified during period. Mortgage loans held for sale Loans Insured Or Guaranteed By Government Authorities, Other [Member] Loans Insured Or Guaranteed By Government Authorities, Other Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Section 162(m) limitation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Section 162(m) Limitation, Percent Effective Income Tax Rate Reconciliation, Nondeductible Expense, Section 162(m) Limitation, Percent Federal taxes calculated at statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Restricted stock units vested and distributed, net of shares withheld Restricted Stock, Value, Shares Issued Net of Tax Withholdings Net amounts Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Fair Value as of Grant Date Award Grant Date Fair Value Collateral Pledged Total Collateral Pledged [Member] Schedule of Gross Unrealized Losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Business Assets Business Assets [Member] Business Assets Transfers and Servicing of Financial Assets [Abstract] Transfers and Servicing of Financial Assets [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Deposits assumed in acquisition Total deposits Business Combination, Recognized Liability Assumed, Deposits Business Combination, Recognized Liability Assumed, Deposits Investments Business Combination, Recognized Assets Acquired, Investments Business Combination, Recognized Assets Acquired, Investments Gross Unrealized Loss , Less than 12 months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Letters of credit Commitments Under Letter Of Credit [Member] Commitments under letter of credit. Total Financing Receivable, Excluding Accrued Interest, Modified, Accumulated Number of full-service branches Number Of Full Service Branches Number Of Full Service Branches Schedule of Outstanding Performance Stock Units Share-Based Payment Arrangement, Performance Shares, Activity [Table Text Block] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Schedule of Purchased Credit-Deteriorated Loans Schedule Of Purchased Credit Deteriorated Credit Quality [Table Text Block] Schedule Of Purchased Credit Deteriorated Credit Quality Aviation Time Sharing Agreements Aviation Time Sharing Agreement [Member] Aviation time sharing agreement. Equity method investment loss Income (Loss) from Equity Method Investments Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Change in fair value: Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions [Abstract] Amortization of right-of-use asset Finance Lease, Right-of-Use Asset, Amortization Loan Restructuring Modification [Axis] Loan Restructuring Modification [Axis] Fair value, sub-total Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value June 30, 2029 Finance Lease, Liability, to be Paid, Rolling Year Three Deposits from related parties Related Party Deposit Liabilities Schedule of Balances and Levels of Assets Measured at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Award Type [Domain] Award Type [Domain] Interest on lease liabilities Finance Lease, Interest Expense Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Significant unobservable inputs (level 3) Level 3 Fair Value, Inputs, Level 3 [Member] U.S. government agency securities US Government Agencies Debt Securities [Member] Transfers from loans HFI to other assets Noncash Transaction, Transfer To Other Assets Noncash Transaction, Transfer To Other Assets Other assets Other Assets Schedule of Loans Defaulted, Previously Modified In Prior 12 Months Financing Receivable, Modified, Subsequent Default [Table Text Block] Actual, amount Banking Regulation, Total Capital, Actual Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Noninterest income (loss): Noninterest Income [Abstract] Cash and cash equivalents at beginning of the period Cash and cash equivalents at end of the period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Financial collateral pledged Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Residential line of credit Residential Line Of Credit [Member] Residential line of credit. Non-NEOs Non-NEOs [Member] Cash consideration Cash consideration for outstanding stock options and fractional shares Payments to Acquire Businesses, Gross Net amounts presented on the consolidated balance sheets Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral Leases Lessee, Operating Leases [Text Block] Due in five to ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Loans HFS and derivatives Loans Held-for-sale And Derivatives [Member] Loans Held-for-sale And Derivatives Repurchase of common stock Payments for Repurchase of Common Stock Statistical Measurement [Axis] Statistical Measurement [Axis] Trade date receivables settled after period end Debt Securities, Available-for-Sale, Trade Date Receivables Settled After Period End Debt Securities, Available-for-Sale, Trade Date Receivables Settled After Period End Schedule of Gains (Losses) Included in the Consolidated Statements of Income Related to Derivative Financial Instruments Derivative Instruments, Gain (Loss) [Table Text Block] Award Type [Axis] Award Type [Axis] Interest rate contracts Interest Rate Contract [Member] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] June 30, 2031 Finance Lease, Liability, to be Paid, Rolling Year Five Real Estate Real Estate [Member] Net increase in deposits Increase (Decrease) in Demand Deposits Retained earnings Retained Earnings (Accumulated Deficit) Total consumer type loans Consumer Portfolio Segment [Member] Product and Service [Axis] Product and Service [Axis] Balance at beginning of period Balance at end of period Repossessed Assets Loans purchased Payments to Acquire Loans Receivable Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] June 30, 2029 Lessee, Operating Lease, Liability, to be Paid, Rolling Year Three Weighted average diluted shares contingently issuable (in shares) Weighted Average Number of Shares, Contingently Issuable Common stock Common Stock [Member] Total commercial loan types Total Commercial Loans [Member] Total Commercial Loans Schedule of Fair Value, Off-balance Sheet Risks [Table] Fair Value, off-Balance-Sheet Risk [Table] Amortization of right-of-use asset Operating Lease, Cost Shares issued under plan (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period Tier 1 capital (to risk-weighted assets) Banking Regulation, Tier 1 Risk-Based Capital [Abstract] Current and prior-period gross charge-offs, 2022-2021 Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff Weighted-average coupon interest rate Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Weighted Average Coupon Interest Rate Servicing assets and servicing liabilities at fair value assumptions used to estimate fair value weighted average coupon interest rate. Derivative Contract [Domain] Derivative Contract [Domain] Multi-family mortgage Multi-Family Mortgage [Member] Multi-family mortgage. 30-89 days past due and accruing interest Financial Asset, Past Due [Member] Total liabilities and shareholders’ equity Liabilities and Equity Variable lease cost Variable Lease, Cost Purchases of Federal Reserve stock Payments to Acquire Federal Reserve Bank Stock Employee Stock Option Share-Based Payment Arrangement, Option [Member] Noncontrolling interest Equity, Attributable to Noncontrolling Interest Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Related Party Related and Nonrelated Parties [Domain] Tabular List, Table Tabular List [Table Text Block] Vesting [Axis] Vesting [Axis] Schedule of Allocation of the Consideration to Net Assets Acquired Business Combination, Consideration Transferred, Equity Interest [Table Text Block] Name Awards Close in Time to MNPI Disclosures, Individual Name Real Estate Properties [Line Items] Real Estate Properties [Line Items] Minimum requirement for capital adequacy with capital buffer, ratio Tier One Risk Based Minimum Capital Adequacy With Capital Buffer To Risk Weighted Assets Tier one risk based minimum capital adequacy with capital buffer to risk weighted assets. Interest and fees on loans Interest And Fee Income, Loans Interest And Fee Income, Loans 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] Financing Receivable Portfolio Segment Financing Receivable Portfolio Segment [Axis] Transfers from loans HFI to other real estate owned Transfers from loans Real Estate Owned, Transfer to Real Estate Owned Net servicing income Servicing Income Loss Servicing income (loss). Adjustment to Compensation: Adjustment to Compensation [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Hedging Designation Hedging Designation [Axis] Total loans held for sale Assets, Fair Value Disclosure Change in related party status Financing Receivable, Before Allowance For Credit Loss, Changes In Related Party Status Financing Receivable, Before Allowance For Credit Loss, Changes In Related Party Status Name Measure Name Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy Fair Value Hierarchy and NAV [Domain] Proceeds from sales of equity securities Proceeds from Sale of Equity Securities, FV-NI Loans Insured or Guaranteed by Government Authorities [Axis] Loans Insured or Guaranteed by Government Authorities [Axis] Additional paid-in capital Additional Paid-in Capital [Member] Credit Quality - Commercial Type Loans Financing Receivable [Policy Text Block] Schedule of Financial Instruments with Off-Balance Sheet Credit Risk Schedule of Fair Value, off-Balance-Sheet Risks [Table Text Block] Unfunded Commitments Unfunded Commitments [Member] Unfunded Commitments [Member] Interest receivable Accrued interest receivable Interest Receivable Name Trading Arrangement, Individual Name Unrecognized compensation cost related to nonvested awards Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Cash and cash equivalents Cash and Cash Equivalent June 30, 2027 Lessee, Operating Lease, Liability, to be Paid, Next Rolling 12 Months Operating lease expense Operating Lease, Expense Bank-owned life insurance Income Tax Reconciliation Bank Owned Life Insurance Income tax reconciliation bank owned life insurance. (Loss) gain from investment securities, net (Gain) loss from investment securities, net Debt and Equity Securities, Gain (Loss) Company Selected Measure Amount Company Selected Measure Amount Depreciation and amortization of fixed assets and software Depreciation, Depletion and Amortization Minimum requirement for capital adequacy with capital buffer, ratio Banking Regulation, Capital Conservation Buffer, Tier 1 Risk-Based Capital, Actual Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing Receivables [Table] Real Estate [Abstract] Real Estate [Abstract] Earnings on bank-owned life insurance Life Insurance, Corporate or Bank Owned, Change in Value Weighted average remaining lease term (in years) - operating Operating Lease, Weighted Average Remaining Lease Term Balance at end of period Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Liability Thereafter Finance Lease, Liability, to be Paid, after Rolling Year Five Non-PEO NEO Non-PEO NEO [Member] Tier 1 capital (to average assets) Banking Regulation, Tier 1 Leverage Capital [Abstract] Schedule of Differences Between Fair Value and Principal Balance for Loans Held for Sale Measured at Fair Value Schedule Of Differences Between Fair Value And Principal Balance For Loans Held For Sale Measured At Fair Value Table [Table Text Block] Schedule of differences between fair value and principal balance for loans held for sale measured at fair value. Total noninterest expense Total noninterest expense Noninterest Expense Award Timing Method Award Timing Method [Text Block] Net change in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Commercial and Industrial Loan Commercial and Industrial Loan [Member] Commercial and Industrial Loan Brokered and internet time deposits Business Combination, Recognized Liability Assumed, Brokered And Internet Time Deposits Business Combination, Recognized Liability Assumed, Brokered And Internet Time Deposits Mortgage Servicing Rights Transfers and Servicing of Financial Assets [Text Block] Tranche Three Share-Based Payment Arrangement, Tranche Three [Member] Net income applicable to FB Financial Corporation Net income applicable to FB Financial Corporation Net Income (Loss) Attributable to Parent Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Proceeds from the sale of premises and equipment Proceeds from Sale of Property, Plant, and Equipment Financing Receivable, Past Due [Table] Financing Receivable, Past Due [Table] Restatement Determination Date: Restatement Determination Date [Axis] LIABILITIES Business Combination, Recognized Liability Assumed, Liability [Abstract] Recoveries of loans previously charged-off Financing Receivable, Allowance for Credit Loss, Recovery Net gains (losses) from fair value changes of mortgage loans Fair Value, Option, Changes in Fair Value, Gain (Loss) Cash collateral pledged on derivatives Collateral Already Posted, Aggregate Fair Value Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Accrued expenses and other liabilities Business Combination, Recognized Liability Assumed, Accrued Expenses And Other Liabilities Business combination recognized identifiable assets acquired and liabilities assumed accrued expenses and other liabilities. Bank-owned life insurance Effective Income Tax Rate Reconciliation, Bank Owned Life Insurance, Percent Effective Income Tax Rate Reconciliation, Bank Owned Life Insurance, Percent Statistical Measurement [Domain] Statistical Measurement [Domain] Schedule of Loans Held For Sale at Fair Value Schedule Of Loans Held-for-sale, Fair Value [Table Text Block] Schedule Of Loans Held-for-sale, Fair Value Document Fiscal Year Focus Document Fiscal Year Focus Gross amounts offset on the consolidated balance sheets Derivative Liability, Subject to Master Netting Arrangement, Asset Offset Merger and integration costs Business Combination, Acquisition-Related Cost, Expense Municipal interest income, net of interest disallowance Effective Income Tax Rate Reconciliation, Nondeductible Expense, Municipal Interest Income, Net Of Interest Disallowance, Percentage Effective Income Tax Rate Reconciliation, Nondeductible Expense, Municipal Interest Income, Net Of Interest Disallowance, Percentage Total deposits Deposits Common stock, $1 par value per share; 75,000,000 shares authorized; 49,976,755 and 51,752,401 shares issued and outstanding, respectively Common Stock, Value, Issued Stock-based compensation withholding payments Payment, Tax Withholding, Share-Based Payment Arrangement Criteria period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period Restatement Determination Date Restatement Determination Date Schedule of Reconciliation of Income Taxes Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Other noninterest expense Other Noninterest Expense Loans and Allowance for Credit Losses on Loans HFI Financing Receivables [Text Block] Amendment Flag Amendment Flag Debt and Equity Securities, FV-NI [Line Items] Debt and Equity Securities, FV-NI [Line Items] Schedule of Payment Status Recorded Investment Financing Receivable, Modified, Past Due [Table Text Block] Gross unrealized losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Loss Contingencies [Table] Loss Contingencies [Table] Investments [Domain] Investments [Domain] Number of securities in securities portfolio Number Of Available For Sale Securities In Portfolio Number of available for sale securities in portfolio. Originations of loans held for sale Payment for Origination, Loan, Mortgage, Held-for-Sale Provision for (reversal of) credit losses on unfunded commitments (Reversal of) provision for credit losses on unfunded commitments Provision For (Reversal Of) Credit Losses On Unfunded Commitments Provision For (Reversal Of) Credit Losses On Unfunded Commitments Lessee, number of finance leases Lessee, Number Of Finance Leases Lessee, Number Of Finance Leases Reserves associated with potential losses on loans Allowance For Loan Repurchases Or Indemnifications Allowance for loan repurchases or indemnifications. Servicing Asset at Fair Value, Amount [Roll Forward] Servicing Asset at Fair Value, Amount [Roll Forward] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] To qualify as well-capitalized under prompt corrective action provision, amount Banking Regulation, Tier 1 Risk-Based Capital, Well Capitalized, Minimum Other real estate owned, net Other Real Estate, Foreclosed Assets, and Repossessed Assets Entity Address, State or Province Entity Address, State or Province Purchases of equity securities Payments to Acquire Equity Securities, FV-NI Nonaccrual loans Financing Receivable, Excluding Accrued Interest, Nonaccrual PEO Total Compensation Amount PEO Total Compensation Amount Accrued expenses and other liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Notional Amount Derivative, Notional Amount Weighted average basic shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Schedule of Analysis of Loans to Management, Executive Officers, Directors and Related Interests Schedule of Related Party Transactions [Table Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Repayments Financing Receivable, before Allowance for Credit Loss, Proceeds for Loan Repayment Other real estate owned, range of inputs Other Real Estate Owned, Measurement Input Southern States Bancshares, Inc. Southern States Bancshares, Inc. [Member] Southern States Bancshares, Inc. Interest-bearing deposits in financial institutions Interest-Bearing Deposits in Banks and Other Financial Institutions Unfunded Loan Commitment Unfunded Loan Commitment [Member] Investments: Investments [Abstract] Due in five to ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Year to date Interest Income Financing Receivable, Nonaccrual, Interest Income Total noninterest income (loss) Total noninterest income Noninterest Income Mortgage banking income, service charges on deposit accounts, investment services and trust income, ATM and interchange fees Revenue from Contract with Customer, Including Assessed Tax Net purchases of FHLB stock Payments to Acquire Federal Home Loan Bank Stock Amortized cost Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Purchase Price: Business Combination, Consideration Transferred [Abstract] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Basis of presentation and use of estimates Basis of Accounting, Policy [Policy Text Block] Earnings available to common shareholders Net Income (Loss) Available to Common Stockholders, Basic Provision expense for credit losses on acquired loans and unfunded commitments Provisions for credit losses Business Combination, Provision For Credit Loss On Acquired Loans And Unfunded Commitments Business Combination, Provision For Credit Loss On Acquired Loans And Unfunded Commitments Loans Business Combination, Recognized Assets Acquired, Loans Business Combination, Recognized Assets Acquired, Loans Sublease income Sublease Income Net loans held for investment Net loans HFI Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss Financing Receivable, Modified, Subsequent Default [Table] Financing Receivable, Modified, Subsequent Default [Table] Loans charged off Financing Receivable, Allowance for Credit Loss, Writeoff Recently adopted accounting standards and Newly issued not yet effective accounting standards New Accounting Pronouncements, Policy [Policy Text Block] Earnings per common share Earnings Per Share, Policy [Policy Text Block] Land Land [Member] Noncontrolling interest Noncontrolling Interest [Member] Futures contracts Future [Member] Core deposit intangible Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill 2024-2023 Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year Changes in: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Securities sold under agreements to repurchase and federal funds purchased Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Residential Real Estate Properties Residential Real Estate [Member] Financial collateral pledged Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Security Exchange Name Security Exchange Name Proceeds from sale of other real estate owned Proceeds From Sale Of Other Real Estate Owned Proceeds From Sale Of Other Real Estate Owned Loans outstanding at January 1, 2026 Loans outstanding at June 30, 2026 Financing Receivable, before Allowance for Credit Loss Total capital (to risk-weighted assets) Banking Regulation, Total Capital [Abstract] Schedule of Credit Quality of Loan Portfolio by Year of Origination Financing Receivable, Amortized Costs Basis By Origination Year [Table Text Block] Financing Receivable, Amortized Costs Basis By Origination Year [Table Text Block] Number of shares available for issuable (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Change in fair value of derivative hedging instruments Change In Fair Value Of Derivative Hedging Instruments Change in fair value of derivative hedging instruments. Fair Value, 12 months or more Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Finance leases Finance Lease, Right-of-Use Asset, after Accumulated Amortization Business Combination, Pro Forma Information [Line Items] Business Combination, Pro Forma Information [Line Items] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Name Outstanding Recovery, Individual Name Reclassification adjustment for loss on securities included in net income, net of tax benefit Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Financial instruments Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset Borrowings Interest Expense, Borrowings Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Estimated impact on fair value of a 20% increase Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Prepayment Speed Supplemental noncash disclosures: Noncash Investing and Financing Items [Abstract] Amortization of core deposit and other intangibles Amortization Of Other Intangible Assets Amortization Of Other Intangible Assets Residential Mortgage Loans Residential Mortgage [Member] Debt Securities Debt Securities [Member] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Weighted average diluted shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Allowance for credit losses on PCD loans Business Combination, Recognized Assets Acquired, Allowance For Credit Losses Business Combination, Recognized Assets Acquired, Allowance For Credit Losses Entity Emerging Growth Company Entity Emerging Growth Company Related Party Transaction [Line Items] Related Party Transaction [Line Items] Total foreclosure proceedings in process Mortgage Loans in Process of Foreclosure, Amount Loans held for investment Gross loans Total Total Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss Underlying Security Market Price Change Underlying Security Market Price Change, Percent Premises and equipment, net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Derivatives Derivative Instruments and Hedging Activities Disclosure [Text Block] Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Gross amounts recognized Derivative Liability, Subject to Master Netting Arrangement, before Offset Mater loan purchase agreement, maximum capacity Financing Receivable, Loan Purchase Agreement, Maximum Capacity Financing Receivable, Loan Purchase Agreement, Maximum Capacity Manufactured loan housing securities Asset-Backed Securities, Securitized Loans and Receivables [Member] Customer time deposits Business Combination, Recognized Liability Assumed, Customer Time Deposits Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Customer Time Deposits Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Schedule of Restricted Equity Securities, At Cost Schedule of Restricted Equity Securities [Table Text Block] Schedule of Restricted Equity Securities Minimum requirement for capital adequacy with capital buffer, amount Minimum Capital Adequacy With Capital Buffer Minimum capital adequacy with capital buffer. Interest Rate Reduction Interest Rate Below Market Reduction [Member] Actual, amount Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Actual Total undiscounted future minimum lease payments Lessee, Operating Lease, Liability, to be Paid Commercial Loan Commercial Loan [Member] Proceeds from sale of loans held for sale Proceeds from Sale, Loan, Held-for-Sale Schedule of Allowance of Credit Losses on Unfunded Commitments Other Commitments [Table Text Block] Current and prior-period gross charge-offs, 2024-2023 Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff Collateral [Domain] Collateral Held [Domain] Balance at beginning of period (in dollars per share) Balance at end of period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value All Executive Categories All Executive Categories [Member] Interest rate-lock commitments Interest rate lock commitments Interest Rate Lock Commitments [Member] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Restricted equity securities, at cost Total restricted equity securities, at cost Restricted Investments Other comprehensive (loss) income, net of tax: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] ESPP Employee Stock Purchase Plan [Member] Employee stock purchase plan. Energy credits Effective Income Tax Rate Reconciliation, Tax Credit, Energy-Related, Amount Transfers from loans HFI to loans held for sale Loan and Lease, Transfer from Held-in-Portfolio to Held-for-Sale Maximum unrecognized compensation cost, payout percentage Share-Based Compensation Arrangement By Share-Based Payment Award, Compensation Cost Not Yet Recognized, Percentage Share-Based Compensation Arrangement By Share-Based Payment Award, Compensation Cost Not Yet Recognized, Percentage Data processing Information Technology and Data Processing Construction Construction Portfolio Segment [Member] Construction portfolio segment. Schedule of Basic and Diluted Earnings Per Common Share Calculation Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Segment Reporting Segment Reporting [Text Block] Maturities, prepayments and calls Proceeds from maturities, prepayments and calls Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Minimum Minimum [Member] Investment Type [Axis] Investment Type [Axis] Expiration of the statute of limitations Effective Income Tax Rate Reconciliation, Expiration Of Statute Of Limitations, Percent Effective Income Tax Rate Reconciliation, Expiration Of Statute Of Limitations, Percent LIABILITIES Liabilities [Abstract] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Federal Home Loan Bank advances Federal Home Loan Bank, Advance, Fair Value Disclosure 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] Schedule of Real Estate Properties [Table] Real Estate Property, Ownership [Table] Business Combination [Line Items] Business Combination [Line Items] Other Real Estate Owned Real Estate Owned [Text Block] Other income Noninterest Income, Other Operating Income Fair Value Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Trade date payables settled after period end Debt Securities, Available-for-Sale, Trade Date Payables Settled After Period End Debt Securities, Available-for-Sale, Trade Date Payables Settled After Period End Common stock, shares authorized (in shares) Common Stock, Shares Authorized Performance adjustment (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Adjustment Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Adjustment Estimated useful life Intangible Asset, Finite-Lived, Useful Life Weighted-average prepayment speed (CPR) Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed Gross realized gains Debt Securities, Available-for-Sale, Realized Gain Schedule of Changes in Restricted Stock Units Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Due in over ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Exercise Price Award Exercise Price Estimated impact on fair value of a 100 bp increase Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transfer Or Servicing Assets Or Liabilities Impact Of One Percent Adverse Change In Discount Rate Sensitivity analysis of fair value of interests continued to be held by transferor servicing assets or liabilities impact of one percent adverse change in discount rate. Recurring Basis Fair Value, Recurring [Member] Investment services and trust income Investment Advisory, Management and Administrative Service [Member] Segment Reporting [Line Items] Segment Reporting [Line Items] Document Quarterly Report Document Quarterly Report 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] Special Mention Special Mention [Member] Minimum Capital Requirements Regulatory Capital Requirements under Banking Regulations [Text Block] Current and prior-period gross charge-offs, 2023-2022 Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff Sales Proceeds from sales Proceeds from Sale of Debt Securities, Available-for-Sale Interest payable Interest Payable June 30, 2031 Lessee, Operating Lease, Liability, to be Paid, Rolling Year Five Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Equity method investments Equity Method Investments Equity Component [Domain] Equity Component [Domain] Adoption Date Trading Arrangement Adoption Date Counterparty Name [Domain] Counterparty Name [Domain] Money market and savings Business Combination, Recognized Liability Assumed, Money Market And Savings Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Money Market And Savings Pacific Coast Banker's Bank stock Pacific Coast Banker's Bank Stock [Member] Pacific Coast Banker's Bank Stock Equity securities, at fair value Equity Securities, FV-NI, Current Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Accounting Policies [Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Activity in available-for-sale securities: Proceeds From Payments To Acquire Available For Sale Securities [Abstract] Proceeds from payments to acquire available for sale securities. Weighted-average servicing fee (basis points) Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Weighted Average Servicing Fee Servicing assets and servicing liabilities at fair value assumptions used to estimate fair value weighted average servicing fee. Operating lease liabilities Operating leases Lease liabilities Operating Lease, Liability Finance leases Lease liabilities Finance Lease, Liability Taxable Interest Income, Securities, Operating, Taxable Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Commercial and industrial Commercial Portfolio Segment [Member] To qualify as well-capitalized under prompt corrective action provision, ratio Common Equity Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Common equity tier one risk based capital required to be well capitalized to risk weighted assets. FHLB stock Federal Home Loan Bank Stock [Member] Federal Home Loan Bank Stock Consumer and other Consumer And Other Portfolio Segment [Member] Consumer and other portfolio segment. Business Combination [Domain] Business Combination [Domain] Net discount attributable to other factors Financing Receivable, Purchased with Credit Deterioration, Discount (Premium) Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Financing Receivables, Period Past Due Financial Asset, Aging [Domain] Restricted stock units vested, net of taxes Restricted Stock Units RSUs Restricted Stock Units (RSUs) [Member] Total servicing income Contractually Specified Servicing Fee, Late Fee, And Ancillary Fee Earned In Exchange For Servicing Financial Asset (Liabilities) Contractually Specified Servicing Fee, Late Fee, And Ancillary Fee Earned In Exchange For Servicing Financial Asset (Liabilities) Lessee, number of operating leases Lessee, Number Of Operating Leases Lessee, Number Of Operating Leases Actual, ratio Common Equity Tier One Risk Based Capital To Risk Weighted Assets Common equity tier one risk based capital to risk weighted assets. All Adjustments to Compensation All Adjustments to Compensation [Member] Business Combination [Axis] Business Combination [Axis] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Residential real estate: Residential real estate: Residential Portfolio Segment [Member] Other Real Estate [Roll Forward] Other Real Estate [Roll Forward] Income Statement [Abstract] Income Statement [Abstract] SHAREHOLDERS’ EQUITY Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report To qualify as well-capitalized under prompt corrective action provision, amount Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Well Capitalized, Minimum Lease liabilities - finance [Extensible Enumeration] Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] City Area Code City Area Code Number of branches acquired Number Of Branches Acquired Number Of Branches Acquired ATM and interchange fees Debit Card [Member] Deposit liabilities, collateral issued, financial instruments Deposit Liabilities, Collateral Issued, Financial Instruments Name Forgone Recovery, Individual Name Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Increase in provision for credit losses from unfunded commitments Increase (Decrease) in Allowance For Credit Losses, Business Acquisitions Increase (Decrease) in Allowance For Credit Losses, Business Acquisitions Interest on investment securities Interest and Dividend Income, Securities, by Taxable Status [Abstract] Total interest income Interest income Interest and Dividend Income, Operating 90 days or  more and accruing interest Financing Receivable, 90 Days or More Past Due, Still Accruing Mortgage loans held for sale Difference Loan, Mortgage, Held-for-Sale, Fair Value Disclosure Municipal interest income, net of interest disallowance Effective Income Tax Rate Reconciliation, Nondeductible Expense, Municipal Interest Income Net Of Interest Disallowance, Amount Effective Income Tax Rate Reconciliation, Nondeductible Expense, Municipal Interest Income Net Of Interest Disallowance, Amount Shares issued under employee stock purchase program Stock Issued During Period, Value, Employee Stock Purchase Plan Value of stock consideration Business Acquisition, Value Of Stock Consideration Business Acquisition, Value Of Stock Consideration To qualify as well-capitalized under prompt corrective action provision, amount Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum Gross amounts offset on the consolidated balance sheets Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Measurement Basis [Axis] Measurement Basis [Axis] Commitments and Contingencies [Roll Forward] Commitments and Contingencies [Roll Forward] Commitments and Contingencies [Roll Forward] June 30, 2030 Lessee, Operating Lease, Liability, to be Paid, Rolling Year Four Loans held for sale, at fair value Business Combination, Recognized Assets Acquired, Loans Held For Sale Business Combination, Recognized Assets Acquired, Loans Held For Sale Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Actual, ratio Banking Regulation, Tier 1 Risk-Based Capital Ratio, Actual Due in one year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Revolving Loans Amortized Cost Basis Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff New market tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent Cash and cash equivalents Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Owner-occupied Commercial real estate owner occupied Owner Occupied [Member] Owner occupied. Schedule of Significant Unobservable Inputs (Level 3) Used in Valuation of Assets Measured at Fair Value on Nonrecurring Basis Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Net unrealized (loss) gain in available-for-sale securities, net of tax (benefit) expense of $(128), $1,190, $(1,028) and $4,679 OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Entity Current Reporting Status Entity Current Reporting Status Net cash provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Schedule of Unaudited Pro Forma Financial Information Business Combination, Pro Forma Information [Table Text Block] Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Weighted average of loans (in months) Financing Receivable, Modified, Weighted-Average Term Increase from Modification Other Other Interest and Dividend Income Financial Instruments [Domain] Financial Instruments [Domain] Federal Reserve Bank stock Federal Reserve Bank Stock [Member] Federal Reserve Bank Stock Provisions for credit losses Initial allowance on loans purchased with deteriorated credit quality Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration 2022-2021 Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year Asset Derivatives Derivative Asset Underlying Securities Award Underlying Securities Amount Comprehensive income applicable to noncontrolling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest  Fair Value Aggregate fair value Estimate of Fair Value Measurement [Member] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative Asset, Statement of Financial Position [Extensible Enumeration] Weighted average discount rate - operating Operating Lease, Weighted Average Discount Rate, Percent Net decrease in securities sold under agreements to repurchase and federal funds purchased Increase (Decrease) In Securities Sold Under Agreements To Repurchase And Federal Funds Purchased Increase (Decrease) In Securities Sold Under Agreements To Repurchase And Federal Funds Purchased Segment Reporting [Table] Segment Reporting [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Table] Total Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Continuing Operation [Abstract] Schedule of Information Related to Company's Leases and Lease Expense Lease, Cost [Table Text Block] Schedule of Amortized Cost, Allowance for Credit Losses and Fair Value Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Fair Value, Less than 12 months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Current Fiscal Year End Date Current Fiscal Year End Date Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Cumulative Effect, Period Of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] Capitalization of mortgage servicing rights Capitalization Of Mortgage Servicing Rights M S Rs Capitalization of mortgage servicing rights. Net amounts presented on the consolidated balance sheets Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral 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] Dividends declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Stock-based compensation expense Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Proceeds from bank-owned life insurance Proceeds from Life Insurance Policy Noncontrolling interest distribution Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Servicing income Contractually Specified Servicing Fees, Amount Weighted Average Grant Date Fair Value Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Measure: Measure [Axis] Tax-exempt Interest Income, Securities, Operating, Tax Exempt Equity Components [Axis] Equity Components [Axis] Cumulative Effect, Period Of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] 30-89 days past due and accruing interest Financing Receivables 30 To 89 Days Past Due [Member] Financing Receivables 30 To 89 Days Past Due Taxes paid, net of refunds Income Tax Paid, after Refund Received Entity Interactive Data Current Entity Interactive Data Current Net income applicable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Estimated impact on fair value of a 10% increase Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Prepayment Speed Due in one to five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five To qualify as well-capitalized under prompt corrective action provision, amount Banking Regulation, Tier 1 Leverage Capital, Well Capitalized, Minimum Interest-bearing checking Business Combination, Recognized Liability Assumed, Interest Bearing, Checking Business Combination, Recognized Liability Assumed, Interest Bearing, Checking Reclassification adjustment for loss on securities included in net income, net of tax benefit of $ —, $15,779, $ — and $15,775 Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Entity Small Reporting Company Entity Small Business Comprehensive income applicable to FB Financial Corporation Comprehensive Income (Loss), Net of Tax, Attributable to Parent To qualify as well-capitalized under prompt corrective action provision, ratio Banking Regulation, Tier 1 Leverage Capital Ratio, Well Capitalized, Minimum Net interest income Net interest income Interest Income (Expense), Operating MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Continuing Operation [Abstract] Document Type Document Type Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Allowance for credit losses on investments Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest Write-downs and partial liquidations Foreclosed Real Estate Expense, Write-Downs and Liquidations Foreclosed Real Estate Expense, Write-Downs and Liquidations Actual, ratio Banking Regulation, Tier 1 Leverage Capital Ratio, Actual Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Local Phone Number Local Phone Number Proceeds from the sale of other assets Proceeds from Sale of Other Assets, Investing Activities Income (loss) before income taxes Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Benefit from stock-based compensation Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Percent Earnings available to common shareholders Net Income (Loss) from Continuing Operations Available to Common Shareholders, Diluted Executive Category: Executive Category [Axis] Schedule of Data and Key Economic Assumptions Related to Mortgage Servicing Rights Schedule of Assumptions for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Table Text Block] Counterparty Name [Axis] Counterparty Name [Axis] Impact of change in accounting estimate for current expected credit losses Financing Receivable, Change in Accounting Estimate, Expected Credit Losses Financing Receivable, Change in Accounting Estimate, Expected Credit Losses Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Gain on sale and change in fair value of loans held for sale Gain (Loss) on Sales of Loans, Net Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] PEO Name PEO Name Accrued expenses and other liabilities Accrued Liabilities and Other Liabilities Financial liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Cash and due from banks Cash and Due from Banks Schedule of Analysis of Aging by Class of Financing Receivable Financing Receivable, Past Due [Table Text Block] Loans current on payments and accruing interest Financial Asset, Not Past Due [Member] ASSETS Business Combination, Recognized Asset Acquired, Asset [Abstract] Other expense Noninterest Expense, Other Noninterest Expense, Other Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Provision for (reversal of) credit losses on loans HFI Financing Receivable, Credit Loss, Expense (Reversal), Excluding Change In Accounting Estimate Financing Receivable, Credit Loss, Expense (Reversal), Excluding Change In Accounting Estimate Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Comprehensive income applicable to FB Financial Corporation and noncontrolling interest Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Fair Value, Measurement Frequency Measurement Frequency [Domain] Loans HFI Business Combination, Recognized Assets Acquired, Financing Receivable Before Allowance For Credit Loss Business Combination, Recognized Assets Acquired, Financing Receivable Before Allowance For Credit Loss Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] Interest expense: Interest Expense, Operating and Nonoperating [Abstract] Salaries, commissions and employee benefits Salaries, commissions and employee benefits Labor and Related Expense Total lease cost Lease, Cost Purchase price percentage of subsequent offering periods Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent Net change in loans Payments for (Proceeds from) Loans and Leases Employee Stock Employee Stock [Member] Weighted-average remaining maturity (in months) Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Weighted-Average Life Basic (in dollars per share) Basic earnings per common share (in dollars per share) Earnings Per Share, Basic Other Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount Insider Trading Arrangements [Line Items] FBK Aviation, LLC FBK Aviation, LLC [Member] FBK Aviation, LLC Short-term lease cost Short-Term Lease, Cost Mortgage loans held for sale - guaranteed GNMA repurchase option Government National Mortgage Association (GNMA) [Member] Total collateral-dependent loans Collateral-dependent net loans held for investment, fair value Financing Receivable, Collateral Dependent Loans, Recorded Investment Financing Receivable, Collateral Dependent Loans, Recorded Investment Bank-owned life insurance Bank Owned Life Insurance Federal Reserve Bank Federal Reserve Bank [Member] Federal Reserve Bank 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] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Current and prior-period gross charge-offs, 2025-2024 Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff Equity Awards Adjustments Equity Awards Adjustments [Member] Federal funds sold and reverse repurchase agreements Federal Funds Sold and Securities Purchased under Agreements to Resell Energy credits Effective Income Tax Rate Reconciliation, Tax Credit, Energy-Related, Percent Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Pass Pass [Member] Plan Name [Axis] Plan Name [Axis] Schedule of Loans Outstanding by Class of Financing Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Banking Banking Segment [Member] Banking segment. Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Unpaid principal balance of mortgage loans sold and serviced for others Continuing Involvement with Transferred Financial Assets, Principal Amount Outstanding Total common shareholders’ equity Parent [Member] Forfeited (in shares) Forfeited or expired (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Schedule of Sales and Other Dispositions of Available-for-Sale Securities Schedule of Realized Gain (Loss) [Table Text Block] Nonaccrual with related allowance Financing Receivable, Nonaccrual, Related Allowance Financing Receivable, Nonaccrual, Related Allowance Expiration of Statute of Limitations Expiration of Statute of Limitations [Member] Expiration of Statute of Limitations Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Non-owner occupied Commercial real estate non-owner occupied Non Owner Occupied [Member] Non-owner occupied. Mortgage-backed securities - commercial Commercial Mortgage-Backed Securities [Member] Master loan purchase agreement, term Financing Receivable, Loan Purchase Agreement, Term Financing Receivable, Loan Purchase Agreement, Term Hedging Designation Hedging Designation [Domain] Legal and professional fees Legal And Professional Fees Legal and professional fees. Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Unfunded commitments Other Commitment Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Income Taxes Income Tax Disclosure [Text Block] Foreclosed residential real estate properties Real Estate Acquired Through Foreclosure Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Entity Filer Category Entity Filer Category Fair Value, Total Debt Securities, Available-for-Sale, Unrealized Loss Position Directors Director [Member] Certain Executive Officers, Certain Management and Directors and Affiliates Certain Executive Officers Certain Management And Directors And Their Associates [Member] Certain executive officers, certain management and directors and their associates. Schedule of Offsetting Liabilities Offsetting Liabilities [Table Text Block] Advertising Advertising Expense Minimum requirement for capital adequacy with capital buffer, amount Banking Regulation, Capital Conservation Buffer, Tier One Risk-Based Capital, Actual, Amount Banking Regulation, Capital Conservation Buffer, Tier One Risk-Based Capital, Actual, Amount Financing Receivables, Period Past Due Financial Asset, Aging [Axis] Not designated as hedging Not Designated as Hedging Instrument [Member] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Deposits Deposits [Abstract] Entity Address, Address Line Two Entity Address, Address Line Two Allowance for Loan and Lease Losses [Roll Forward] Allowance for Loan and Lease Losses [Roll Forward] Net income applicable to FB Financial Corporation and noncontrolling interest Net income applicable to FB Financial Corporation and noncontrolling interest Net income attributable to FB Financial Corporation and noncontrolling interest Net income applicable to FB Financial Corporation and noncontrolling interest Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Other Effective Income Tax Rate Reconciliation, Other Reconciling Items, Percent Purchase price per share (in dollars per share) Business Combination, Price Per Share Liability Derivatives Derivative Liability Total revenues Business Combination, Pro Forma Information, Pro Forma Revenue Entity Address, Address Line One Entity Address, Address Line One Right-of-use assets obtained in exchange for operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Income tax expense (benefit) Income tax expense, as reported Income Tax Expense (Benefit) Derivative financial liabilities Offsetting Derivative Liabilities [Abstract] Total Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] 90 days or  more and accruing interest Financial Asset, Equal To Or Greater Than 90 Days Past Due [Member] Financial Asset, Equal To Or Greater Than 90 Days Past Due Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Statement [Table] Statement [Table] Tranche Two Share-Based Payment Arrangement, Tranche Two [Member] New loans and advances Financing Receivable, before Allowance for Credit Loss, Addition from New Loan To qualify as well-capitalized under prompt corrective action provision, ratio Banking Regulation, Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum 2025-2024 Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year Schedule of Amortized Cost, Related Allowance and Interest Income of Non-accrual Loans Financing Receivable, Nonaccrual [Table Text Block] Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Other assets and interest receivable Increase Decrease In Other Assets And Interest Receivable Increase decrease in other assets and interest receivable. Gross amounts recognized Derivative Asset, Subject to Master Netting Arrangement, before Offset Loans held for sale, at fair value Loan, Held-for-Sale, Fair Value Disclosure Financing Receivable, Impaired [Line Items] Financing Receivable, Impaired [Line Items] Basis of presentation Basis of Presentation and Significant Accounting Policies [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract]