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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

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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