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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
	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			$ 57,409us-gaap_ProceedsFromDivestitureOfBusinesses
Pre-tax gain	12,619us-gaap_GainLossOnSaleOfBusiness		12,619us-gaap_GainLossOnSaleOfBusiness
Cash paid			49,482us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired	(74,713)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired	15,451us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Goodwill			1,921us-gaap_GoodwillAcquiredDuringPeriod		8,846us-gaap_GoodwillAcquiredDuringPeriod
Business acquisition, bargain purchase gain		9,014us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount		9,014us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount
Pro forma tax benefits recognized					11,700tbk_BusinessAcquisitionProFormaRecognizedTaxBenefits
Doral Healthcare Acquisition
Business Acquisition [Line Items]
Loans			45,334us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = tbk_DoralHealthcareAcquisitionMember
Cash paid			49,482us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = tbk_DoralHealthcareAcquisitionMember
Goodwill			1,921us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = tbk_DoralHealthcareAcquisitionMember
Fair value of acquired loans not classified as PCI			41,680tbk_BusinessCombinationAcquiredReceivablesNotPCIFairValue / us-gaap_BusinessAcquisitionAxis = tbk_DoralHealthcareAcquisitionMember
NBI Acquisition
Business Acquisition [Line Items]
Loans		568,358us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember	545,246us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember	568,358us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember		568,358us-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				9,014us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember
Senior notes, outstanding balance									11,858tbk_BusinessCombinationAcquiredSeniorNotes / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember
Senior convertible notes outstanding									3,640tbk_BusinessCombinationAcquiredSeniorConvertibleNotes / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember
Revenues on acquired operations					5,916us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember	12,014us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember	1,099us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember
Earnings on acquired operations						2,834us-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				2,500us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember	52us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember
Pro forma tax benefits recognized					4,300tbk_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								57,409us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = tbk_SaleOfPewaukeeBranchMember / dei_LegalEntityAxis = tbk_TriumphCommunityBankMember
Deposits								36,326tbk_DepositsOfDisposalGroupNotDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = tbk_SaleOfPewaukeeBranchMember / dei_LegalEntityAxis = tbk_TriumphCommunityBankMember
Carrying amount of Loans Sold								78,071tbk_LoansOfDisposalGroupNotDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = tbk_SaleOfPewaukeeBranchMember / dei_LegalEntityAxis = tbk_TriumphCommunityBankMember
Pre-tax gain								12,619us-gaap_GainLossOnSaleOfBusiness / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = tbk_SaleOfPewaukeeBranchMember / dei_LegalEntityAxis = tbk_TriumphCommunityBankMember
Triumph Bancorp Inc
Business Acquisition [Line Items]
Pro forma tax benefits recognized					$ 7,400tbk_BusinessAcquisitionProFormaRecognizedTaxBenefits / dei_LegalEntityAxis = tbk_TriumphBancorpIncMember

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