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Minimum Capital Requirements (Tables)
 12 Months Ended
Dec. 31, 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 of December 31, 2022
ActualMinimum Capital
adequacy with
capital buffer		To be well capitalized
under prompt corrective
action provisions
AmountRatioAmountRatioAmountRatio
Total Capital (to risk-weighted assets)      
FB Financial Corporation$1,528,344 13.1 %$1,225,161 10.5 %N/AN/A
FirstBank1,506,543 12.9 %1,222,922 10.5 %$1,164,688 10.0 %
Tier 1 Capital (to risk-weighted assets)
FB Financial Corporation$1,315,386 11.3 %$991,797 8.5 %N/AN/A
FirstBank1,293,585 11.1 %989,985 8.5 %$931,750 8.0 %
Tier 1 Capital (to average assets)
FB Financial Corporation$1,315,386 10.5 %$499,648 4.0 %N/AN/A
FirstBank1,293,585 10.4 %499,194 4.0 %$623,992 5.0 %
Common Equity Tier 1 Capital
(to risk-weighted assets)
FB Financial Corporation$1,285,386 11.0 %$816,774 7.0 %N/AN/A
FirstBank1,293,585 11.1 %815,281 7.0 %$757,047 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 %