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Related party transactions - Schedule of Loans Analysis to Executive Officers, Certain Management, Bank Directors and Their Affiliates (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2020 USD ($)
Financing Receivable, Related Parties [Roll Forward] |
Loans outstanding, beginning balance | $ 30,880
New loans and advances | 5,870
Change in related party status | 4,167
Repayments | (8,200)
Loans outstanding, ending balance | $ 32,717

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- Definition Financing Receivable, Related Parties + References No definition available. + Details
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- Definition Financing Receivable, Related Parties, Additions + References No definition available. + Details
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Namespace Prefix: | fbk_
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Period Type: | duration

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- Definition Financing Receivable, Related Parties, Changes In Related Party Status + References No definition available. + Details
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- Definition Financing Receivable, Related Parties, Proceeds + References No definition available. + Details
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Namespace Prefix: | fbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Financing Receivable, Related Parties [Roll Forward] + References No definition available. + Details
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Namespace Prefix: | fbk_
Data Type: | xbrli:stringItemType
Balance Type: | na
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