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Basis of presentation - Basic and Diluted Earnings Per Common Share Calculation (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Basic earnings per common share calculation:                      
Net income applicable to FB Financial Corporation $ 45,602 $ (5,599) $ 22,873 $ 745 $ 21,572 $ 23,966 $ 18,688 $ 19,588 $ 63,621 $ 83,814 $ 80,236
Dividends paid on and undistributed earnings allocated to participating securities                 0 (447) (428)
Earnings available to common shareholders                 $ 63,621 $ 83,367 $ 79,808
Weighted average basic shares outstanding (in shares) 47,204,738 40,154,841 32,094,274 31,257,739 30,934,092 30,899,583 30,859,596 30,786,684 37,621,720 30,870,474 30,675,755
Basic earnings per common share (in dollars per share) $ 0.97 $ (0.14) $ 0.71 $ 0.02 $ 0.69 $ 0.77 $ 0.60 $ 0.63 $ 1.69 $ 2.70 $ 2.60
Diluted earnings per common share:                      
Earnings available to common shareholders                 $ 63,621 $ 83,367 $ 79,808
Weighted average basic shares outstanding (in shares) 47,204,738 40,154,841 32,094,274 31,257,739 30,934,092 30,899,583 30,859,596 30,786,684 37,621,720 30,870,474 30,675,755
Weighted average diluted shares contingently issuable (in shares)                 478,024 532,423 639,226
Weighted average diluted shares outstanding (in shares) 47,791,659 40,637,745 32,506,417 31,734,112 31,470,565 31,425,573 31,378,018 31,349,198 38,099,744 31,402,897 31,314,981
Diluted (loss) earnings per common share (in dollars per share) $ 0.95 $ (0.14) $ 0.70 $ 0.02 $ 0.68 $ 0.76 $ 0.59 $ 0.62 $ 1.67 $ 2.65 $ 2.55
Restricted stock units outstanding considered to be antidilutive (in shares)                 239,813