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Regulatory Matters - Schedule of Actual Capital Amounts and Ratios (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Triumph Bancorp Inc    
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]    
Total capital (to Risk Weighted Assets) Actual Amount $ 436,036 $ 342,059
Total Capital (to Risk Weighted Assets) Actual Ratio 13.20% 14.60%
Total Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Amount $ 264,026 $ 187,449
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 $ 367,958 $ 277,605
Tier 1 Capital (to Risk Weighted Assets) Actual Ratio 11.10% 11.80%
Tier 1 Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Amount $ 198,019 $ 140,587
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 $ 320,265 $ 238,439
Common Equity Tier 1 Capital (to Risk Weighted Assets) Actual Ratio 9.70% 10.20%
Common Equity Tier 1 Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Amount $ 148,514 $ 105,440
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 $ 367,958 $ 277,605
Tier 1 Capital (to Average Assets) Actual Ratio 11.80% 10.90%
Tier 1 Capital (to Average Assets) Minimum for Capital Adequacy Purposes Amount $ 124,754 $ 102,303
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 $ 361,068 $ 293,313
Total Capital (to Risk Weighted Assets) Actual Ratio 11.40% 12.90%
Total Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Amount $ 254,139 $ 181,640
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 $ 317,674 $ 227,050
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 $ 341,910 $ 277,593
Tier 1 Capital (to Risk Weighted Assets) Actual Ratio 10.80% 12.20%
Tier 1 Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Amount $ 190,603 $ 136,230
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 $ 254,137 $ 181,640
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 $ 341,910 $ 277,593
Common Equity Tier 1 Capital (to Risk Weighted Assets) Actual Ratio 10.80% 12.20%
Common Equity Tier 1 Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Amount $ 142,952 $ 102,173
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 $ 206,486 $ 147,583
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 $ 341,910 $ 277,593
Tier 1 Capital (to Average Assets) Actual Ratio 11.10% 11.00%
Tier 1 Capital (to Average Assets) Minimum for Capital Adequacy Purposes Amount $ 123,088 $ 100,802
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 $ 153,860 $ 126,002
Tier 1 Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 5.00% 5.00%