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Minimum Capital Requirements (Tables)
 3 Months Ended
Mar. 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 March 31, 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$1,456,669 14.2 %$1,077,296 10.5 %N/AN/A
FirstBank1,413,849 13.8 %1,075,838 10.5 %$1,024,608 10.0 %
Tier 1 Capital (to risk-weighted assets)
FB Financial Corporation$1,264,358 12.3 %$872,096 8.5 %N/AN/A
FirstBank1,221,538 11.9 %870,917 8.5 %$819,686 8.0 %
Tier 1 Capital (to average assets)
FB Financial Corporation$1,264,358 10.2 %$497,942 4.0 %N/AN/A
FirstBank1,221,538 9.8 %497,337 4.0 %$621,671 5.0 %
Common Equity Tier 1 Capital
(to risk-weighted assets)
FB Financial Corporation$1,234,358 12.0 %$718,197 7.0 %N/AN/A
FirstBank1,221,538 11.9 %717,226 7.0 %$665,995 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 %