Basis of presentation (Tables)

12 Months Ended

Dec. 31, 2021

Accounting Policies [Abstract]

Schedule of Basic and Diluted Earnings Per Common Share Calculation

The following is a summary of the basic and diluted earnings per common share calculation for each of the periods presented:

	Year Ended December 31,
	2021		2020		2019
Basic earnings per common share calculation:
Net income applicable to FB Financial Corporation	$	190,285	$	63,621	$	83,814
Dividends paid on and undistributed earnings allocated to    participating securities	—		—		(447)
Earnings available to common shareholders	$	190,285	$	63,621	$	83,367
Weighted average basic shares outstanding	47,431,102		37,621,720		30,870,474
Basic earnings per common share	$	4.01	$	1.69	$	2.70
Diluted earnings per common share:
Earnings available to common shareholders	$	190,285	$	63,621	$	83,367
Weighted average basic shares outstanding	47,431,102		37,621,720		30,870,474
Weighted average diluted shares contingently issuable(1)	524,778		478,024		532,423
Weighted average diluted shares outstanding	47,955,880		38,099,744		31,402,897
Diluted earnings per common share	$	3.97	$	1.67	$	2.65

 (1) Excludes 4,400 and 239,813 restricted stock units outstanding considered to be antidilutive as of December 31, 2021 and 2020, respectively.