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Regulatory Matters - Schedule of Actual Capital Amounts and Ratios (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Triumph Bancorp Inc |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |
Total capital (to Risk Weighted Assets) Actual Amount | $ 552,398 | $ 436,036
Total Capital (to Risk Weighted Assets) Actual Ratio | 13.40% | 13.20%
Total Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Amount | $ 330,970 | $ 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 | $ 475,359 | $ 367,958
Tier 1 Capital (to Risk Weighted Assets) Actual Ratio | 11.50% | 11.10%
Tier 1 Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Amount | $ 248,227 | $ 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 | $ 436,276 | $ 320,265
Common Equity Tier 1 Capital (to Risk Weighted Assets) Actual Ratio | 10.50% | 9.70%
Common Equity Tier 1 Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Amount | $ 186,170 | $ 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 | $ 475,359 | $ 367,958
Tier 1 Capital (to Average Assets) Actual Ratio | 11.10% | 11.80%
Tier 1 Capital (to Average Assets) Minimum for Capital Adequacy Purposes Amount | $ 171,619 | $ 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 | $ 496,526 | $ 361,068
Total Capital (to Risk Weighted Assets) Actual Ratio | 12.40% | 11.40%
Total Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Amount | $ 320,856 | $ 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 | $ 401,071 | $ 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 | $ 468,500 | $ 341,910
Tier 1 Capital (to Risk Weighted Assets) Actual Ratio | 11.70% | 10.80%
Tier 1 Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Amount | $ 240,642 | $ 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 | $ 320,856 | $ 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 | $ 468,500 | $ 341,910
Common Equity Tier 1 Capital (to Risk Weighted Assets) Actual Ratio | 11.70% | 10.80%
Common Equity Tier 1 Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Amount | $ 180,482 | $ 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 | $ 260,696 | $ 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 | $ 468,500 | $ 341,910
Tier 1 Capital (to Average Assets) Actual Ratio | 11.00% | 11.10%
Tier 1 Capital (to Average Assets) Minimum for Capital Adequacy Purposes Amount | $ 170,092 | $ 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 | $ 212,615 | $ 153,860
Tier 1 Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | 5.00% | 5.00%

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