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Commitments and Contingencies - Schedule of Activity in the Repurchase Reserve (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Commitments and Contingencies [Roll Forward]
Balance at beginning of period	$ 899	$ 1,621
Provision for (reversal of) loan repurchases or indemnifications	50	(250)
Losses on loans repurchased or indemnified	(19)	(13)
Balance at end of period	$ 930	$ 1,358

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

X

- 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