Minimum capital requirements (Tables)

3 Months Ended

Mar. 31, 2021

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.

	Actual				Minimum Capital adequacy with capital buffer				To be well capitalized under prompt corrective action provisions
March 31, 2021	Amount		Ratio		Amount		Ratio		Amount		Ratio
Total Capital (to risk-weighted assets)
FB Financial Corporation	$	1,353,195	14.6	%	$	972,054	10.5	%	N/A		N/A
FirstBank	1,316,420		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/A		N/A
FirstBank	1,121,997		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/A		N/A
FirstBank	1,121,997		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/A		N/A
FirstBank	1,121,997		12.1	%	646,954		7.0	%	$	600,743	6.5	%

	Actual				Minimum Capital adequacy with capital buffer				To be well capitalized under prompt corrective action provisions
December 31, 2020	Amount		Ratio		Amount		Ratio		Amount		Ratio
Total Capital (to risk-weighted assets)
FB Financial Corporation	$	1,358,897	15.0	%	$	952,736	10.5	%	N/A		N/A
FirstBank	1,353,279		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/A		N/A
FirstBank	1,142,548		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/A		N/A
FirstBank	1,142,548		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/A		N/A
FirstBank	1,142,548		12.6	%	634,218		7.0	%	$	588,917	6.5	%