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Business Combinations and Divestitures - Schedule of Loans Acquired in Business Combination (Details) (PCI Loans, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
PCI Loans
 
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_PciLoansMember
Contractual cash flows not expected to be collected (nonaccretable difference) (873)us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference
/ us-gaap_BusinessAcquisitionAxis
= tbk_PciLoansMember
Expected cash flows at acquisition 4,136us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition
/ us-gaap_BusinessAcquisitionAxis
= tbk_PciLoansMember
Accretable yield (482)us-gaap_CertainLoansAcquiredInTransferAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= tbk_PciLoansMember
Fair value of acquired PCI loans $ 3,654us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue
/ us-gaap_BusinessAcquisitionAxis
= tbk_PciLoansMember