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Income Taxes - Summary of Effective Income Tax Rate Reconciliation (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]                      
Tax provision computed at federal statutory rate                 $ 10,436us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 5,290us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 1,931us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State taxes, net                 1,160us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 148us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 85us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Change in effective tax rate                 (528)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate    
Bargain purchase gain                   (3,065)tbk_IncomeTaxReconciliationBargainPurchaseGain  
Transaction costs                   259tbk_IncomeTaxReconciliationTransactionCosts  
Noncontrolling interest in subsidiary                 (22)us-gaap_IncomeTaxReconciliationMinorityInterestIncomeExpense (215)us-gaap_IncomeTaxReconciliationMinorityInterestIncomeExpense  
Bank-owned life insurance                 (165)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance (40)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance  
Tax exempt interest                 (189)us-gaap_IncomeTaxReconciliationTaxExemptIncome (42)us-gaap_IncomeTaxReconciliationTaxExemptIncome  
Change in valuation allowance for deferred tax asset                 (441)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 7us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount (7,372)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Other                 127us-gaap_IncomeTaxReconciliationOtherAdjustments (209)us-gaap_IncomeTaxReconciliationOtherAdjustments (38)us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax expense (benefit) $ 747us-gaap_IncomeTaxExpenseBenefit $ 6,089us-gaap_IncomeTaxExpenseBenefit $ 1,626us-gaap_IncomeTaxExpenseBenefit $ 1,916us-gaap_IncomeTaxExpenseBenefit $ 1,449us-gaap_IncomeTaxExpenseBenefit $ 211us-gaap_IncomeTaxExpenseBenefit $ 356us-gaap_IncomeTaxExpenseBenefit $ 117us-gaap_IncomeTaxExpenseBenefit $ 10,378us-gaap_IncomeTaxExpenseBenefit $ 2,133us-gaap_IncomeTaxExpenseBenefit $ (5,394)us-gaap_IncomeTaxExpenseBenefit