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Commitments and Contingencies - Schedule of Activity in the Repurchase Reserve (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Commitments and Contingencies [Roll Forward] |  |  |  |
Balance at beginning of period | $ 811 | $ 1,129 | $ 899 | $ 1,621
Provision for (reversal of) loan repurchases or indemnifications | 75 | (200) | 200 | (650)
Losses on loans repurchased or indemnified | (178) | 0 | (391) | (42)
Balance at end of period | $ 708 | $ 929 | $ 708 | $ 929

X
- Definition Allowance for loan repurchases or indemnifications. + References No definition available. + Details
Name: | fbk_AllowanceForLoanRepurchasesOrIndemnifications
Namespace Prefix: | fbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Allowance For Loan Repurchases Or Indemnifications, Losses On Loans Repurchased Or Indemnified + References No definition available. + Details
Name: | fbk_AllowanceForLoanRepurchasesOrIndemnificationsLossesOnLoansRepurchasedOrIndemnified
Namespace Prefix: | fbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Commitments and Contingencies [Roll Forward] + References No definition available. + Details
Name: | fbk_CommitmentsandContingenciesRollForward
Namespace Prefix: | fbk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Provision for mortgage loan repurchase or indemnifications. + References No definition available. + Details
Name: | fbk_ProvisionForMortgageLoanRepurchasesOrIndemnifications
Namespace Prefix: | fbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration