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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
Mar. 31, 2024
Mar. 31, 2023
Basic earnings per common share:    
Net income applicable to FB Financial Corporation $ 27,950 $ 36,381
Dividends paid on and undistributed earnings allocated to participating securities 0 0
Earnings available to common shareholders $ 27,950 $ 36,381
Weighted average basic shares outstanding (in shares) 46,874,882 46,679,618
Basic earnings per common share (in dollars per share) $ 0.60 $ 0.78
Diluted earnings per common share:    
Earnings available to common shareholders $ 27,950 $ 36,381
Weighted average basic shares outstanding (in shares) 46,874,882 46,679,618
Weighted average diluted shares contingently issuable (in shares) 123,991 85,536
Weighted average diluted shares outstanding (in shares) 46,998,873 46,765,154
Diluted earnings per common share (in dollars per share) $ 0.59 $ 0.78
Restricted Stock Units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Restricted stock units outstanding considered to be antidilutive (in shares) 2,949 159,946