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Basis of Presentation (Tables)
 12 Months Ended
Dec. 31, 2023
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:
Years Ended December 31,
 202320222021
Basic earnings per common share:
Net income applicable to FB Financial Corporation$120,224 $124,555 $190,285 
Dividends paid on and undistributed earnings allocated to
   participating securities		— — — 
Earnings available to common shareholders$120,224 $124,555 $190,285 
Weighted average basic shares outstanding46,781,214 47,113,470 47,431,102 
Basic earnings per common share$2.57 $2.64 $4.01 
Diluted earnings per common share:
Earnings available to common shareholders$120,224 $124,555 $190,285 
Weighted average basic shares outstanding46,781,214 47,113,470 47,431,102 
Weighted average diluted shares contingently issuable(1)
41,578 126,321 524,778 
Weighted average diluted shares outstanding46,822,792 47,239,791 47,955,880 
Diluted earnings per common share$2.57 $2.64 $3.97 
 (1) Excludes 172,677, 11,888, and 4,400 restricted stock units outstanding considered to be antidilutive as of December 31, 2023, 2022, and 2021 respectively.