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Minimum capital requirements - Schedule of Actual and Required Capital Amounts and Ratios (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
FB Financial Corporation    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital (to risk-weighted assets), Actual Amount $ 1,334,127 $ 633,549
Total Capital (to risk-weighted assets), Actual Ratio 0.153 0.122
Total Capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 697,583 $ 415,442
Total Capital (to risk-weighted assets), For capital adequacy purposes, Ratio 0.080 0.080
Total Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Amount $ 915,577 $ 545,268
Total Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio 10.50% 10.50%
Tier 1 Capital (to risk-weighted assets), Actual Amount $ 1,054,144 $ 602,410
Tier 1 Capital (to risk-weighted assets), Actual Ratio 0.121 0.116
Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 522,716 $ 311,591
Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Ratio 0.060 0.060
Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Amount $ 740,514 $ 441,421
Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio 8.50% 8.50%
Tier 1 Capital (to average assets), Actual Amount $ 1,054,144 $ 602,410
Tier 1 Capital (to average assets), Actual Ratio 0.118 0.101
Tier 1 Capital (to average assets), For capital adequacy purposes, Amount $ 357,564 $ 238,578
Tier 1 Capital (to average assets), For capital adequacy purposes, Ratio 0.040 0.040
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Amount $ 1,024,144 $ 572,410
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Ratio 11.80% 11.10%
Common Equity Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 390,563 $ 232,058
Common Equity Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Ratio 4.50% 4.50%
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Amount $ 607,543 $ 360,979
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio 7.00% 7.00%
FirstBank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital (to risk-weighted assets), Actual Amount $ 1,314,864 $ 623,432
Total Capital (to risk-weighted assets), Actual Ratio 0.150 0.121
Total Capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 701,261 $ 412,186
Total Capital (to risk-weighted assets), For capital adequacy purposes, Ratio 0.080 0.080
Total Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Amount $ 920,405 $ 540,995
Total Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio 10.50% 10.50%
Total Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Amount $ 876,576 $ 515,233
Total Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Ratio 0.100 0.100
Tier 1 Capital (to risk-weighted assets), Actual Amount $ 1,107,144 $ 592,293
Tier 1 Capital (to risk-weighted assets), Actual Ratio 0.127 0.115
Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 523,060 $ 309,022
Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Ratio 0.060 0.060
Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Amount $ 741,002 $ 437,782
Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio 8.50% 8.50%
Tier 1 Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions Amount $ 697,414 $ 412,030
Tier 1 Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions Ratio 0.080 0.080
Tier 1 Capital (to average assets), Actual Amount $ 1,107,144 $ 592,293
Tier 1 Capital (to average assets), Actual Ratio 0.124 0.099
Tier 1 Capital (to average assets), For capital adequacy purposes, Amount $ 357,143 $ 239,310
Tier 1 Capital (to average assets), For capital adequacy purposes, Ratio 0.040 0.040
Tier 1 Capital (to average assets), To be well capitalized under prompt corrective action provisions, Amount $ 446,429 $ 299,138
Tier 1 Capital (to average assets), To be well capitalized under prompt corrective action provisions, Ratio 0.050 0.050
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Amount $ 1,107,144 $ 592,293
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Ratio 12.70% 11.50%
Common Equity Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 392,295 $ 231,767
Common Equity Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Ratio 4.50% 4.50%
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Amount $ 610,237 $ 360,526
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio 7.00% 7.00%
Common Equity Tier 1 Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Amount $ 566,649 $ 334,774
Common Equity Tier 1 Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Ratio 6.50% 6.50%