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Commitments and Contingencies - Activity in the Repurchase Reserve (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Commitments and Contingencies [Roll Forward] |  |
Balance at beginning of period | $ 4,802 | $ 5,928
Provision for loan repurchases or indemnifications | (389) | 440
Losses on loans repurchased or indemnified | (96) | (84)
Balance at end of period | $ 4,317 | $ 6,284

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: | debit
Period Type: | duration