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Loans and Allowance for Loan and Lease Losses - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Loans [Line Items]
Net deferred origination fees and costs and deferred factoring fees	906us-gaap_LoansAndLeasesReceivableDeferredIncome	$ 997us-gaap_LoansAndLeasesReceivableDeferredIncome
Loans with carrying amounts	141,427us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	166,688us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
Percentage of total loan portfolio on factored receivables	15.00%tbk_FactoredReceivablesPercentageOfLoanPortfolio
Recorded investments in troubled debt restructurings	360,000us-gaap_FinancingReceivableModificationsRecordedInvestment	336,000us-gaap_FinancingReceivableModificationsRecordedInvestment
Loans receivable | Factored receivables
Loans [Line Items]
Customer reserves	18,976tbk_CustomerReserves / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tbk_FactoredReceivablesSegmentMember	$ 10,653tbk_CustomerReserves / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tbk_FactoredReceivablesSegmentMember
Geographic Concentration Risk | Accounts Receivable
Loans [Line Items]
Percentage of customers located within states	67.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember
Geographic Concentration Risk | Illinois | Accounts Receivable
Loans [Line Items]
Percentage of customers located within states	30.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember / us-gaap_StatementGeographicalAxis = stpr_IL
Geographic Concentration Risk | Iowa | Accounts Receivable
Loans [Line Items]
Percentage of customers located within states	14.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember / us-gaap_StatementGeographicalAxis = stpr_IA
Geographic Concentration Risk | Texas | Accounts Receivable
Loans [Line Items]
Percentage of customers located within states	23.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember / us-gaap_StatementGeographicalAxis = stpr_TX

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Customer reserves associated factored receivables held on deposit.

+ References

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Factored receivables as a percent of total loans.

+ References

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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-Publisher FASB

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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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