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Basis of Presentation - Schedule of Basic and Diluted Earnings Per Common Share Calculation (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Basic earnings per common share:        
Net income applicable to FB Financial Corporation $ 10,220 $ 19,175 $ 78,149 $ 90,855
Dividends paid on and undistributed earnings allocated to participating securities 0 0 0 0
Earnings available to common shareholders $ 10,220 $ 19,175 $ 78,149 $ 90,855
Weighted average basic shares outstanding (in shares) 46,650,563 46,818,612 46,762,213 46,759,703
Basic earnings per common share (in dollars per share) $ 0.22 $ 0.41 $ 1.67 $ 1.94
Diluted earnings per common share:        
Earnings available to common shareholders $ 10,220 $ 19,175 $ 78,149 $ 90,855
Weighted average basic shares outstanding (in shares) 46,650,563 46,818,612 46,762,213 46,759,703
Weighted average diluted shares contingently issuable (in shares) 152,767 37,810 111,824 42,840
Weighted average diluted shares outstanding (in shares) 46,803,330 46,856,422 46,874,037 46,802,543
Diluted earnings per common share (in dollars per share) $ 0.22 $ 0.41 $ 1.67 $ 1.94
Restricted Stock Units        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Restricted stock units outstanding considered to be antidilutive (in shares) 4 217,546 904 218,815