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Regulatory Matters - Schedule of Actual Capital Amounts and Ratios (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Triumph Bancorp Inc    
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]    
Total capital (to Risk Weighted Assets) Actual Amount $ 529,965 $ 436,036
Total Capital (to Risk Weighted Assets) Actual Ratio 13.00% 13.20%
Total Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Amount $ 324,920 $ 264,026
Total Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Ratio 8.00% 8.00%
Tier 1 Capital (to Risk Weighted Assets) Actual Amount $ 453,295 $ 367,958
Tier 1 Capital (to Risk Weighted Assets) Actual Ratio 11.20% 11.10%
Tier 1 Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Amount $ 243,690 $ 198,019
Tier 1 Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Ratio 6.00% 6.00%
Common Equity Tier 1 Capital (to Risk Weighted Assets) Actual Amount $ 404,671 $ 320,265
Common Equity Tier 1 Capital (to Risk Weighted Assets) Actual Ratio 10.00% 9.70%
Common Equity Tier 1 Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Amount $ 182,767 $ 148,514
Common Equity Tier 1 Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Ratio 4.50% 4.50%
Tier 1 Capital (to Average Assets) Actual Amount $ 453,295 $ 367,958
Tier 1 Capital (to Average Assets) Actual Ratio 11.70% 11.80%
Tier 1 Capital (to Average Assets) Minimum for Capital Adequacy Purposes Amount $ 154,333 $ 124,754
Tier 1 Capital (to Average Assets) Minimum for Capital Adequacy Purposes Ratio 4.00% 4.00%
TBK Bank SSB    
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]    
Total capital (to Risk Weighted Assets) Actual Amount $ 471,802 $ 361,068
Total Capital (to Risk Weighted Assets) Actual Ratio 12.00% 11.40%
Total Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Amount $ 314,844 $ 254,139
Total Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Ratio 8.00% 8.00%
Total Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 393,555 $ 317,674
Total Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 10.00% 10.00%
Tier 1 Capital (to Risk Weighted Assets) Actual Amount $ 444,126 $ 341,910
Tier 1 Capital (to Risk Weighted Assets) Actual Ratio 11.30% 10.80%
Tier 1 Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Amount $ 236,133 $ 190,603
Tier 1 Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Ratio 6.00% 6.00%
Tier 1 Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 314,843 $ 254,137
Tier 1 Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 8.00% 8.00%
Common Equity Tier 1 Capital (to Risk Weighted Assets) Actual Amount $ 444,126 $ 341,910
Common Equity Tier 1 Capital (to Risk Weighted Assets) Actual Ratio 11.30% 10.80%
Common Equity Tier 1 Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Amount $ 177,099 $ 142,952
Common Equity Tier 1 Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Ratio 4.50% 4.50%
Common Equity Tier 1 Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 255,810 $ 206,486
Common Equity Tier 1 Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 6.50% 6.50%
Tier 1 Capital (to Average Assets) Actual Amount $ 444,126 $ 341,910
Tier 1 Capital (to Average Assets) Actual Ratio 11.70% 11.10%
Tier 1 Capital (to Average Assets) Minimum for Capital Adequacy Purposes Amount $ 152,037 $ 123,088
Tier 1 Capital (to Average Assets) Minimum for Capital Adequacy Purposes Ratio 4.00% 4.00%
Tier 1 Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 190,046 $ 153,860
Tier 1 Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 5.00% 5.00%