Minimum Capital Requirements (Tables)

3 Months Ended

Mar. 31, 2018

Banking And Thrift [Abstract]

Schedule of Actual and Required Capital Amounts and Ratios

Actual and required capital amounts and ratios are presented below at period-end:

	Actual					For capital adequacy purposes					Minimum Capital adequacy with capital buffer					To be well capitalized under prompt corrective action provisions
	Amount		Ratio			Amount		Ratio			Amount		Ratio			Amount		Ratio
March 31, 2018
Total Capital (to risk-weighted assets)
FB Financial Corporation	$	506,921		12.3	%	$	328,636		8.0	%	$	405,865		9.9	%	N/A		N/A
FirstBank		476,454		11.6	%		328,589		8.0	%		405,807		9.9	%	$	410,736		10.0	%
Tier 1 Capital (to risk-weighted assets)
FB Financial Corporation	$	482,515		11.8	%	$	246,391		6.0	%	$	323,593		7.9	%	N/A		N/A
FirstBank		452,048		11.0	%		246,348		6.0	%		323,537		7.9	%	$	246,348		6.0	%
Tier 1 Capital (to average assets)
FB Financial Corporation	$	482,515		10.7	%	$	180,043		4.0	%	N/A		N/A			N/A		N/A
FirstBank		452,048		10.0	%		180,819		4.0	%	N/A		N/A			$	226,024		5.0	%
Common Equity Tier 1 Capital    (to risk-weighted assets)
FB Financial Corporation	$	452,515		11.0	%	$	184,784		4.5	%	$	261,982		6.4	%	N/A		N/A
FirstBank		452,048		11.0	%		184,761		4.5	%		261,950		6.4	%	$	266,877		6.5	%

	Actual					For capital adequacy purposes					Minimum Capital adequacy with capital buffer					To be well capitalized under prompt corrective action provisions
	Amount		Ratio			Amount		Ratio			Amount		Ratio			Amount		Ratio
December 31, 2017
Total Capital (to risk-weighted assets)
FB Financial Corporation	$	496,422		12.0	%	$	330,672		8.0	%	$	382,340		9.3	%	N/A		N/A
FirstBank		466,102		11.3	%		329,984		8.0	%		381,544		9.3	%	$	412,480		10.0	%
Tier 1 Capital (to risk-weighted assets)
FB Financial Corporation	$	472,381		11.4	%	$	247,969		6.0	%	$	299,629		7.3	%	N/A		N/A
FirstBank		442,061		10.7	%		247,422		6.0	%		298,968		7.3	%	$	247,422		6.0	%
Tier 1 Capital (to average assets)
FB Financial Corporation	$	472,381		10.5	%	$	180,643		4.0	%	N/A		N/A			N/A		N/A
FirstBank		442,061		9.8	%		180,987		4.0	%	N/A		N/A			$	226,234		5.0	%
Common Equity Tier 1 Capital    (to risk-weighted assets)
FB Financial Corporation	$	442,381		10.7	%	$	185,874		4.5	%	$	237,506		5.8	%	N/A		N/A
FirstBank		442,061		10.7	%		185,567		4.5	%		237,113		5.8	%	$	268,041		6.5	%