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Commitments and Contingencies - Summary of Allowance for Loan Repurchases or Indemnifications (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Commitments And Contingencies Disclosure [Abstract] |  |  |  |
Balance at beginning of period | $ 2,842 | $ 2,546 | $ 2,659 | $ 2,156
Provision for loan repurchases or indemnifications | 201 | 313 | 384 | 703
Losses on loans repurchased or indemnified | (6) |  | (6) |
Balance at end of period | $ 3,037 | $ 2,859 | $ 3,037 | $ 2,859

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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, 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

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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