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Minimum Capital Requirements (Tables)
 9 Months Ended
Sep. 30, 2024
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.

September 30, 2024
ActualMinimum Requirement for Capital Adequacy with
Capital Buffer		To Qualify as Well-Capitalized Under Prompt Corrective Action Provisions
AmountRatioAmountRatioAmountRatio
Total Capital (to risk-weighted assets)      
FB Financial Corporation$1,686,651 15.1 %$1,170,701 10.5 %N/AN/A
FirstBank1,651,199 14.9 %1,167,269 10.5 %$1,111,684 10.0 %
Tier 1 Capital (to risk-weighted assets)
FB Financial Corporation$1,447,410 13.0 %$947,711 8.5 %N/AN/A
FirstBank1,412,362 12.7 %944,932 8.5 %$889,347 8.0 %
Common Equity Tier 1 Capital
   (to risk-weighted assets)
FB Financial Corporation$1,417,410 12.7 %$780,468 7.0 %N/AN/A
FirstBank1,412,362 12.7 %778,179 7.0 %$722,595 6.5 %
Tier 1 Capital (to average assets)
FB Financial Corporation$1,447,410 11.5 %$505,439 4.0 %N/AN/A
FirstBank1,412,362 11.2 %504,643 4.0 %$630,804 5.0 %
December 31, 2023ActualMinimum Requirement for Capital Adequacy with
Capital Buffer		To Qualify as Well-Capitalized Under Prompt Corrective Action Provisions
AmountRatioAmountRatioAmountRatio
Total Capital (to risk-weighted assets)      
FB Financial Corporation$1,635,848 14.5 %$1,182,028 10.5 %N/AN/A
FirstBank1,600,950 14.2 %1,179,886 10.5 %$1,123,701 10.0 %
Tier 1 Capital (to risk-weighted assets)
FB Financial Corporation$1,405,890 12.5 %$956,880 8.5 %N/AN/A
FirstBank1,370,991 12.2 %955,145 8.5 %$898,960 8.0 %
Common Equity Tier 1 Capital
(to risk-weighted assets)
FB Financial Corporation$1,375,890 12.2 %$788,018 7.0 %N/AN/A
FirstBank1,370,991 12.2 %786,590 7.0 %$730,405 6.5 %
Tier 1 Capital (to average assets)
FB Financial Corporation$1,405,890 11.3 %$496,485 4.0 %N/AN/A
FirstBank1,370,991 11.1 %495,761 4.0 %$619,701 5.0 %