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Commitments and contingencies - Summary of Allowance for Loan Repurchases or Indemnifications (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Balance at beginning of period | $ 4,601 | $ 3,407 | $ 3,529 | $ 3,273
Provision for loan repurchases or indemnifications | 901 | 107 | 2,128 | 255
Recoveries on previous losses | (44) | (79) | (199) | (93)
Balance at end of period | $ 5,458 | $ 3,435 | $ 5,458 | $ 3,435

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- 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, recoveries on previous losses + References No definition available. + Details
Name: | fbk_AllowanceForLoanRepurchasesOrIndemnificationsRecoveriesOnPreviousLosses
Namespace Prefix: | fbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration