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Subsequent Events - Additional Information (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
9 Months Ended 0 Months Ended
Sep. 30, 2014
Nov. 20, 2014
Nov. 13, 2014
Dec. 01, 2014
Dec. 31, 2013
Dec. 31, 2014
Subsequent Event [Line Items]            
Stock issued, par value 0.01us-gaap_CommonStockParOrStatedValuePerShare       $ 0.01us-gaap_CommonStockParOrStatedValuePerShare  
Senior Secured Note            
Subsequent Event [Line Items]            
Maturity date Oct. 15, 2018          
T A R P Preferred Stock            
Subsequent Event [Line Items]            
Total redemption price           $ 26,200us-gaap_PreferredStockRedemptionAmount
/ us-gaap_StatementClassOfStockAxis
= tbk_TARPPreferredStockMember
Subsequent Events            
Subsequent Event [Line Items]            
Gross proceeds from initial public offering   92,460us-gaap_ProceedsFromIssuanceInitialPublicOffering
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
       
Net proceeds upon underwriting discounts and estimated offering expenses   83,000us-gaap_SaleOfStockConsiderationReceivedOnTransaction
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
       
Subsequent Events | Senior Secured Note            
Subsequent Event [Line Items]            
Senior secured note principal amount     11,300us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Percentage of prepayment penalty     1.00%tbk_PercentageOfPrepaymentPenalty
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Prepayment penalty     113us-gaap_PaymentsOfDebtExtinguishmentCosts
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Accrued but unpaid interest     41us-gaap_DebtInstrumentIncreaseAccruedInterest
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Subsequent Events | Prime Rate | Senior Secured Note            
Subsequent Event [Line Items]            
Prime rate with minimum interest rate     4.50%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_VariableRateAxis
= us-gaap_PrimeRateMember
     
Subsequent Events | Omnibus Incentive Plan            
Subsequent Event [Line Items]            
Aggregate number of common stock available for issuance     1,200,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= tbk_OmnibusIncentivePlanMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Subsequent Events | Restricted Stock | Officer | Omnibus Incentive Plan            
Subsequent Event [Line Items]            
Shares granted to officers and employees       378,343us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= tbk_OmnibusIncentivePlanMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember
   
Subsequent Events | Initial Public Offering            
Subsequent Event [Line Items]            
Shares of common stock     6,700,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
     
Stock issued, par value     $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
     
Sale of stock price, per share     $ 12.00us-gaap_SaleOfStockPricePerShare
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
     
Gross proceeds from initial public offering     80,400us-gaap_ProceedsFromIssuanceInitialPublicOffering
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
     
Subsequent Events | Overallotment            
Subsequent Event [Line Items]            
Shares of common stock   1,005,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_OverAllotmentOptionMember
       
Gross proceeds from initial public offering   $ 12,060us-gaap_ProceedsFromIssuanceInitialPublicOffering
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_OverAllotmentOptionMember