Minimum Capital Requirements (Tables)

9 Months Ended

Sep. 30, 2017

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
September 30, 2017
Total Capital (to risk-weighted assets)
FB Financial Corporation	$	481,360		12.18	%	$	316,164		8.0	%	$	365,565		9.25	%	N/A		N/A
FirstBank		449,795		11.31	%		318,157		8.0	%		367,869		9.25	%	$	397,697		10.0	%
Tier 1 Capital (to risk-weighted assets)
FB Financial Corporation	$	457,878		11.58	%	$	237,242		6.0	%	$	286,668		7.25	%	N/A		N/A
FirstBank		426,313		10.72	%		238,608		6.0	%		288,318		7.25	%	$	238,608		6.0	%
Tier 1 Capital (to average assets)
FB Financial Corporation	$	457,878		11.35	%	$	161,367		4.0	%	N/A		N/A			N/A		N/A
FirstBank		426,313		10.58	%		161,177		4.0	%	N/A		N/A			$	201,471		5.0	%
Common Equity Tier 1 Capital    (to risk-weighted assets)
FB Financial Corporation	$	427,878		10.82	%	$	177,953		4.5	%	$	227,384		5.75	%	N/A		N/A
FirstBank		426,313		10.72	%		178,956		4.5	%		228,666		5.75	%	$	258,492		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, 2016
Total Capital (to risk-weighted assets)
FB Financial Corporation	$	338,893		13.03	%	$	208,069		8.0	%	$	224,325		8.63	%	N/A		N/A
FirstBank		304,018		11.72	%		207,521		8.0	%		223,733		8.63	%	$	259,401		10.0	%
Tier 1 Capital (to risk-weighted assets)
FB Financial Corporation	$	317,146		12.19	%	$	156,101		6.0	%	$	172,362		6.63	%	N/A		N/A
FirstBank		282,271		10.88	%		155,664		6.0	%		171,879		6.63	%	$	155,664		6.0	%
Tier 1 Capital (to average assets)
FB Financial Corporation	$	317,146		10.05	%	$	126,227		4.0	%	N/A		N/A			N/A		N/A
FirstBank		282,271		8.95	%		126,155		4.0	%	N/A		N/A			$	157,693		5.0	%
Common Equity Tier 1 Capital    (to risk-weighted assets)
FB Financial Corporation	$	287,146		11.04	%	$	117,043		4.5	%	$	133,299		5.13	%	N/A		N/A
FirstBank		282,271		10.88	%		116,748		4.5	%		132,963		5.13	%	$	168,636		6.5	%