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Minimum Capital Requirements
 9 Months Ended
Sep. 30, 2024
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]  
Minimum Capital Requirements Minimum capital requirements
Banks and bank holding companies are subject to regulatory capital requirements administered by federal banking agencies. Capital adequacy guidelines and, additionally for banks, prompt corrective action regulations involve quantitative measures of assets, liabilities, and certain off-balance sheet items calculated under regulatory accounting practices. Capital amounts and classifications are also subject to qualitative judgments by regulators. Failure to meet capital requirements can initiate regulatory action.
Under regulatory guidance for non-advanced approach institutions, the Bank and Company are required to maintain minimum capital ratios as outlined in the table below. Minimum risk-based capital adequacy ratios below include a capital conservation buffer of 2.50%. As of September 30, 2024 and December 31, 2023, the Bank and Company met all capital adequacy requirements to which they are subject. Additionally, under U.S. Basel III Capital Rules, the Bank and Company opted out of including accumulated other comprehensive income in regulatory capital.
The Company elected to phase-in the impact related to adopting ASU 2016-13 over the permissible five-year transition relief period and delayed the initial impact of CECL adoption plus 25% of the quarterly increases in ACL in the first two
years after adoption. Beginning in 2022, the cumulative amount of the transition adjustments became fixed and were phased out in annual increments over a three-year period. 2024 represents the final year of this CECL adoption phase out, with 25% of the initial impact of CECL adoption being adjusted out of regulatory capital calculations.
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 %