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Minimum Capital Requirements (Tables)
 9 Months Ended
Sep. 30, 2022
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]  
Schedule of Actual and Required Capital Amounts and Ratios
Actual and required capital amounts and ratios are included below as of the dates indicated.

 As oAs of September 30, 2022ActualMinimum Capital
adequacy with
capital buffer		To be well capitalized
under prompt corrective
action provisions
AmountRatioAmountRatioAmountRatio
Total Capital (to risk-weighted assets)      
FB Financial Corporation$1,501,110 13.0 %$1,210,236 10.5 %N/AN/A
FirstBank1,472,955 12.8 %1,208,502 10.5 %$1,150,954 10.0 %
Tier 1 Capital (to risk-weighted assets)
FB Financial Corporation$1,287,489 11.2 %$979,715 8.5 %N/AN/A
FirstBank1,259,334 10.9 %978,311 8.5 %$920,764 8.0 %
Tier 1 Capital (to average assets)
FB Financial Corporation$1,287,489 10.7 %$479,489 4.0 %N/AN/A
FirstBank1,259,334 10.5 %479,290 4.0 %$599,113 5.0 %
Common Equity Tier 1 Capital
(to risk-weighted assets)
FB Financial Corporation$1,257,489 10.9 %$806,824 7.0 %N/AN/A
FirstBank1,259,334 10.9 %805,668 7.0 %$748,120 6.5 %
As of December 31, 2021ActualMinimum Capital
adequacy with
capital buffer		To be well capitalized
under prompt corrective
action provisions
AmountRatioAmountRatioAmountRatio
Total Capital (to risk-weighted assets)      
FB Financial Corporation$1,434,581 14.5 %$1,039,984 10.5 %N/AN/A
FirstBank1,396,407 14.1 %1,038,760 10.5 %$989,295 10.0 %
Tier 1 Capital (to risk-weighted assets)
FB Financial Corporation$1,251,874 12.6 %$841,892 8.5 %N/AN/A
FirstBank1,213,700 12.3 %840,901 8.5 %$791,436 8.0 %
Tier 1 Capital (to average assets)
FB Financial Corporation$1,251,874 10.5 %$474,831 4.0 %N/AN/A
FirstBank1,213,700 10.2 %474,044 4.0 %$592,555 5.0 %
Common Equity Tier 1 Capital
(to risk-weighted assets)
FB Financial Corporation$1,221,874 12.3 %$693,322 7.0 %N/AN/A
FirstBank1,213,700 12.3 %692,507 7.0 %$643,042 6.5 %