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Minimum capital requirements
3 Months Ended
Mar. 31, 2021
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 approaches institutions, the Bank and Company are required to maintain minimum capital ratios as outlined in the table below. Additionally, under U.S. Basel III Capital Rules, the decision was made to opt out of including accumulated other comprehensive income in regulatory capital. As of March 31, 2021 and December 31, 2020, the Bank and Company met all capital adequacy requirements to which they are subject.
In March 2020, the OCC, the Board of Governors of the Federal Reserve System, and the FDIC announced a final rule to delay the estimated impact on regulatory capital stemming from the implementation of CECL. The final rule maintains the three-year transition option in the previous rule and provides banks the option to delay for two years an estimate of CECL’s effect on regulatory capital, relative to the incurred loss methodology’s effect on regulatory capital, followed by a three-year transition period (five-year transition option). The Company adopted the capital transition relief over the permissible five-year period.
Actual and required capital amounts and ratios are included below as of the dates indicated.

 ActualMinimum Capital
adequacy with
capital buffer
To be well capitalized
under prompt corrective
action provisions
March 31, 2021AmountRatioAmountRatioAmountRatio
Total Capital (to risk-weighted assets)      
FB Financial Corporation$1,353,195 14.6 %$972,054 10.5 %N/AN/A
FirstBank1,316,420 14.2 %970,431 10.5 %$924,220 10.0 %
Tier 1 Capital (to risk-weighted assets)
FB Financial Corporation$1,138,657 12.3 %$786,901 8.5 %N/AN/A
FirstBank1,121,997 12.1 %785,587 8.5 %$739,376 8.0 %
Tier 1 Capital (to average assets)
FB Financial Corporation$1,138,657 10.1 %$450,971 4.0 %N/AN/A
FirstBank1,121,997 10.0 %450,889 4.0 %$563,611 5.0 %
Common Equity Tier 1 Capital
(to risk-weighted assets)
FB Financial Corporation$1,108,657 12.0 %$648,036 7.0 %N/AN/A
FirstBank1,121,997 12.1 %646,954 7.0 %$600,743 6.5 %
 ActualMinimum Capital
adequacy with
capital buffer
To be well capitalized
under prompt corrective
action provisions
December 31, 2020AmountRatioAmountRatioAmountRatio
Total Capital (to risk-weighted assets)      
FB Financial Corporation$1,358,897 15.0 %$952,736 10.5 %N/AN/A
FirstBank1,353,279 14.9 %951,327 10.5 %$906,026 10.0 %
Tier 1 Capital (to risk-weighted assets)
FB Financial Corporation$1,090,364 12.0 %$771,262 8.5 %N/AN/A
FirstBank1,142,548 12.6 %770,122 8.5 %$724,820 8.0 %
Tier 1 Capital (to average assets)
FB Financial Corporation$1,090,364 10.0 %$435,064 4.0 %N/AN/A
FirstBank1,142,548 10.5 %435,279 4.0 %$544,098 5.0 %
Common Equity Tier 1 Capital
(to risk-weighted assets)
FB Financial Corporation$1,060,364 11.7 %$635,157 7.0 %N/AN/A
FirstBank1,142,548 12.6 %634,218 7.0 %$588,917 6.5 %