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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets    
Capital loss carryforwards   $ 379us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Acquired loan basis 5,422tbk_DeferredTaxAssetsAcquiredLoanBasis 8,876tbk_DeferredTaxAssetsAcquiredLoanBasis
Other real estate owned 1,543tbk_DeferredTaxAssetsOtherRealEstateOwned 1,684tbk_DeferredTaxAssetsOtherRealEstateOwned
AMT credit carryforward 1,634tbk_DeferredTaxAssetsAMTCreditCarryforward 1,768tbk_DeferredTaxAssetsAMTCreditCarryforward
Acquired deposit basis 158tbk_DeferredTaxAssetsAcquiredDepositBasis 633tbk_DeferredTaxAssetsAcquiredDepositBasis
Allowance for loan losses 3,081us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses 564us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses
Other 587us-gaap_DeferredTaxAssetsOther 2,595us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 26,291us-gaap_DeferredTaxAssetsGross 31,906us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities    
Goodwill and intangible assets 4,025us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets 5,135us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets
Fair value adjustment on junior subordinated debentures 3,182tbk_DeferredTaxLiabilityFairValueAdjustmentOnJuniorSubordinatedDebentures 3,451tbk_DeferredTaxLiabilityFairValueAdjustmentOnJuniorSubordinatedDebentures
Unrealized gain on securities available for sale 534tbk_DeferredTaxLiabilitiesUnrealizedGainsOnAvailableForSaleSecurities 56tbk_DeferredTaxLiabilitiesUnrealizedGainsOnAvailableForSaleSecurities
Other 1,436us-gaap_DeferredTaxLiabilitiesOther 858us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities 9,177us-gaap_DeferredIncomeTaxLiabilities 9,500us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax asset before valuation allowance 17,114tbk_NetDeferredTaxAssetsLiabilitiesBeforeValuationAllowance 22,406tbk_NetDeferredTaxAssetsLiabilitiesBeforeValuationAllowance
Valuation allowance (1,158)us-gaap_DeferredTaxAssetsValuationAllowance (1,599)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax asset 15,956us-gaap_DeferredTaxAssetsLiabilitiesNet 20,807us-gaap_DeferredTaxAssetsLiabilitiesNet
Federal    
Deferred tax assets    
Net operating loss carryforwards 11,570us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		 12,596us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
State    
Deferred tax assets    
Net operating loss carryforwards $ 2,296us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		 $ 2,811us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember