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Business Combinations and Divestitures - Schedule of Loans Acquired in Business Combination (Details) (PCI Loans, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Oct. 15, 2013
Doral Healthcare Acquisition    
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period [Line Items]    
Contractual balance at acquisition $ 5,009us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition
/ us-gaap_BusinessAcquisitionAxis
= tbk_DoralHealthcareAcquisitionMember
/ us-gaap_InternalCreditAssessmentAxis
= tbk_PurchasedCreditImpairedLoansMember
 
Contractual cash flows not expected to be collected (nonaccretable difference) (873)us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference
/ us-gaap_BusinessAcquisitionAxis
= tbk_DoralHealthcareAcquisitionMember
/ us-gaap_InternalCreditAssessmentAxis
= tbk_PurchasedCreditImpairedLoansMember
 
Expected cash flows at acquisition 4,136us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition
/ us-gaap_BusinessAcquisitionAxis
= tbk_DoralHealthcareAcquisitionMember
/ us-gaap_InternalCreditAssessmentAxis
= tbk_PurchasedCreditImpairedLoansMember
 
Accretable yield (482)us-gaap_CertainLoansAcquiredInTransferAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= tbk_DoralHealthcareAcquisitionMember
/ us-gaap_InternalCreditAssessmentAxis
= tbk_PurchasedCreditImpairedLoansMember
 
Fair value of acquired PCI loans 3,654us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue
/ us-gaap_BusinessAcquisitionAxis
= tbk_DoralHealthcareAcquisitionMember
/ us-gaap_InternalCreditAssessmentAxis
= tbk_PurchasedCreditImpairedLoansMember
 
NBI Acquisition    
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period [Line Items]    
Contractual balance at acquisition   29,970us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
/ us-gaap_InternalCreditAssessmentAxis
= tbk_PurchasedCreditImpairedLoansMember
Contractual cash flows not expected to be collected (nonaccretable difference)   (5,141)us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
/ us-gaap_InternalCreditAssessmentAxis
= tbk_PurchasedCreditImpairedLoansMember
Expected cash flows at acquisition   24,829us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
/ us-gaap_InternalCreditAssessmentAxis
= tbk_PurchasedCreditImpairedLoansMember
Accretable yield   (1,717)us-gaap_CertainLoansAcquiredInTransferAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
/ us-gaap_InternalCreditAssessmentAxis
= tbk_PurchasedCreditImpairedLoansMember
Fair value of acquired PCI loans   $ 23,112us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
/ us-gaap_InternalCreditAssessmentAxis
= tbk_PurchasedCreditImpairedLoansMember