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Business Combinations and Divestitures - Additional Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended |
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Sep. 30, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 | Oct. 14, 2013 | Jul. 11, 2014 | Oct. 15, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Net cash proceeds |  |  | $ 57,409 us-gaap_ProceedsFromDivestitureOfBusinesses |  |  |  |  |  |
Pre-tax gain | 12,619 us-gaap_GainLossOnSaleOfBusiness |  | 12,619 us-gaap_GainLossOnSaleOfBusiness |  |  |  |  |  |
Cash paid |  |  | 49,482 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | (74,713)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 15,451 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |  |  |
Goodwill |  |  | 1,921 us-gaap_GoodwillAcquiredDuringPeriod |  | 8,846 us-gaap_GoodwillAcquiredDuringPeriod |  |  |  |
Business acquisition, bargain purchase gain |  | 9,014 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount |  | 9,014 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount |  |  |  |  |
Pro forma tax benefits recognized |  |  |  |  | 11,700 tbk_BusinessAcquisitionProFormaRecognizedTaxBenefits |  |  |  |
Doral Healthcare Acquisition |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Loans |  |  | 45,334 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = tbk_DoralHealthcareAcquisitionMember |  |  |  |  |  |
Cash paid |  |  | 49,482 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = tbk_DoralHealthcareAcquisitionMember |  |  |  |  |  |
Goodwill |  |  | 1,921 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = tbk_DoralHealthcareAcquisitionMember |  |  |  |  |  |
Fair value of acquired loans not classified as PCI |  |  | 41,680 tbk_BusinessCombinationAcquiredReceivablesNotPCIFairValue / us-gaap_BusinessAcquisitionAxis = tbk_DoralHealthcareAcquisitionMember |  |  |  |  |  |
NBI Acquisition |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Loans |  | 568,358 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember | 545,246 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember | 568,358 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  | 568,358 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |  |
Business acquisition, percentage of voting interests acquired |  |  |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember
Business acquisition, bargain purchase gain |  |  |  | 9,014 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |  |  |  |
Senior notes, outstanding balance |  |  |  |  |  |  |  |  | 11,858 tbk_BusinessCombinationAcquiredSeniorNotes / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember
Senior convertible notes outstanding |  |  |  |  |  |  |  |  | 3,640 tbk_BusinessCombinationAcquiredSeniorConvertibleNotes / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember
Revenues on acquired operations |  |  |  |  | 5,916 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember | 12,014 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember | 1,099 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |
Earnings on acquired operations |  |  |  |  |  | 2,834 us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |  |
Pro forma information adjusted |  |  | To determine pro forma information, the Company adjusted its 2013 and 2012 historical results to include the historical results for NBI for the period January 1, 2013 to October 14, 2013 and the year ended December 31, 2012. These amounts were $1,099,000 and $5,916,000, respectively. |  |  |  |  |  |
Business acquisition, related costs |  |  |  | 2,500 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember | 52 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |  |  |
Pro forma tax benefits recognized |  |  |  |  | 4,300 tbk_BusinessAcquisitionProFormaRecognizedTaxBenefits / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |  |  |
THE National Bank |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired |  |  |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = tbk_TheNationalBankMember
TCB | Sale of Pewaukee Branch |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Net cash proceeds |  |  |  |  |  |  |  | 57,409 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = tbk_SaleOfPewaukeeBranchMember / dei_LegalEntityAxis = tbk_TriumphCommunityBankMember |
Deposits |  |  |  |  |  |  |  | 36,326 tbk_DepositsOfDisposalGroupNotDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = tbk_SaleOfPewaukeeBranchMember / dei_LegalEntityAxis = tbk_TriumphCommunityBankMember |
Carrying amount of Loans Sold |  |  |  |  |  |  |  | 78,071 tbk_LoansOfDisposalGroupNotDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = tbk_SaleOfPewaukeeBranchMember / dei_LegalEntityAxis = tbk_TriumphCommunityBankMember |
Pre-tax gain |  |  |  |  |  |  |  | 12,619 us-gaap_GainLossOnSaleOfBusiness / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = tbk_SaleOfPewaukeeBranchMember / dei_LegalEntityAxis = tbk_TriumphCommunityBankMember |
Triumph Bancorp Inc |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Pro forma tax benefits recognized |  |  |  |  | $ 7,400 tbk_BusinessAcquisitionProFormaRecognizedTaxBenefits / dei_LegalEntityAxis = tbk_TriumphBancorpIncMember |  |  |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Description of the pro forma information, nature of adjustments made to historical information to arrive at pro forma amounts, amounts excluded from pro forma information, any material-nonrecurring items included in the pro forma information and limitations of pro forma disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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- Definition In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6571-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6527-128477 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6396-128476 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6387-128476 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6393-128476 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment. + References No definition available. + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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