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Regulatory Matters - Schedule of Actual Capital Amounts and Ratios (Details) - USD ($) $ in Thousands | Jun. 30, 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 | $ 600,394 | $ 436,036
Total Capital (to Risk Weighted Assets) Actual Ratio | 16.70% | 13.20%
Total Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Amount | $ 286,840 | $ 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 | $ 526,582 | $ 367,958
Tier 1 Capital (to Risk Weighted Assets) Actual Ratio | 14.70% | 11.10%
Tier 1 Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Amount | $ 215,130 | $ 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 | $ 478,075 | $ 320,265
Common Equity Tier 1 Capital (to Risk Weighted Assets) Actual Ratio | 13.30% | 9.70%
Common Equity Tier 1 Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Amount | $ 161,348 | $ 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 | $ 526,582 | $ 367,958
Tier 1 Capital (to Average Assets) Actual Ratio | 15.00% | 11.80%
Tier 1 Capital (to Average Assets) Minimum for Capital Adequacy Purposes Amount | $ 140,394 | $ 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 | $ 401,800 | $ 361,068
Total Capital (to Risk Weighted Assets) Actual Ratio | 11.70% | 11.40%
Total Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Amount | $ 274,269 | $ 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 | $ 342,836 | $ 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 | $ 376,968 | $ 341,910
Tier 1 Capital (to Risk Weighted Assets) Actual Ratio | 11.00% | 10.80%
Tier 1 Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Amount | $ 205,701 | $ 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 | $ 274,268 | $ 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 | $ 376,968 | $ 341,910
Common Equity Tier 1 Capital (to Risk Weighted Assets) Actual Ratio | 11.00% | 10.80%
Common Equity Tier 1 Capital (to Risk Weighted Assets) Minimum for Capital Adequacy Purposes Amount | $ 154,276 | $ 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 | $ 222,843 | $ 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 | $ 376,968 | $ 341,910
Tier 1 Capital (to Average Assets) Actual Ratio | 10.90% | 11.10%
Tier 1 Capital (to Average Assets) Minimum for Capital Adequacy Purposes Amount | $ 138,127 | $ 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 | $ 172,658 | $ 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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- Definition The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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- Definition Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 + Details
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