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Business Combinations and Divestitures - Schedule of Proforma Information on Acquisitions (Details) (NBI Acquisition, USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
NBI Acquisition |  |
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items] |  |
Net interest income | $ 60,685 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember | $ 60,831 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember
Net income before tax | 12,719 us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember | 17,398 us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember
Tax (expense) benefit | (4,244)tbk_BusinessAcquisitionsProFormaIncomeTaxExpenseBenefit / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember | 5,825 tbk_BusinessAcquisitionsProFormaIncomeTaxExpenseBenefit / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember
Net income | 8,475 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember | 23,223 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember
Effect of noncontrolling interests | (3,506)tbk_BusinessAcquisitionsProFormaEffectOfNoncontrollingInterests / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember | (3,011)tbk_BusinessAcquisitionsProFormaEffectOfNoncontrollingInterests / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember
Net income to common stockholders | $ 4,969 tbk_BusinessAcquisitionsProFormaNetIncomeAvailableToCommonStockholdersBasic / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember | $ 20,212 tbk_BusinessAcquisitionsProFormaNetIncomeAvailableToCommonStockholdersBasic / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember
Basic earnings per share | $ 0.51 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember | $ 2.06 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember
Diluted earnings per share | $ 0.51 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember | $ 2.00 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember

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