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Minimum Capital Requirements (Tables)
 3 Months Ended
Mar. 31, 2023
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, 2023
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$1,557,049 13.6 %$1,205,137 10.5 %N/AN/A
FirstBank1,524,500 13.3 %1,204,213 10.5 %$1,146,869 10.0 %
Tier 1 Capital (to risk-weighted assets)
FB Financial Corporation$1,331,158 11.6 %$975,587 8.5 %N/AN/A
FirstBank1,298,609 11.3 %974,839 8.5 %$917,495 8.0 %
Tier 1 Capital (to average assets)
FB Financial Corporation$1,331,158 10.4 %$512,344 4.0 %N/AN/A
FirstBank1,298,609 10.2 %511,666 4.0 %$639,583 5.0 %
Common Equity Tier 1 Capital
(to risk-weighted assets)
FB Financial Corporation$1,301,158 11.3 %$803,424 7.0 %N/AN/A
FirstBank1,298,609 11.3 %802,808 7.0 %$745,465 6.5 %
As of December 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$1,528,344 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 %