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Business Combinations and Divestitures - Summary of Fair Values of the Identifiable Assets Acquired and Liabilities Assumed (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Assets acquired:  
Loans $ 45,334us-gaap_BusinessCombinationAcquiredReceivablesFairValue
Liabilities assumed:  
Cash paid 49,482us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Goodwill 1,921us-gaap_GoodwillAcquiredDuringPeriod
Doral Healthcare Acquisition  
Assets acquired:  
Loans 45,334us-gaap_BusinessCombinationAcquiredReceivablesFairValue
/ us-gaap_BusinessAcquisitionAxis
= tbk_DoralHealthcareAcquisitionMember
Intangible assets 2,029us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= tbk_DoralHealthcareAcquisitionMember
Premises and equipment 50us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= tbk_DoralHealthcareAcquisitionMember
Other assets 276tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= tbk_DoralHealthcareAcquisitionMember
Total Assets Acquired 47,689us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= tbk_DoralHealthcareAcquisitionMember
Liabilities assumed:  
Customer deposits 128us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialLiabilities
/ us-gaap_BusinessAcquisitionAxis
= tbk_DoralHealthcareAcquisitionMember
Fair value of net assets acquired 47,561us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= tbk_DoralHealthcareAcquisitionMember
Cash paid 49,482us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= tbk_DoralHealthcareAcquisitionMember
Goodwill 1,921us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= tbk_DoralHealthcareAcquisitionMember
NBI Acquisition  
Assets acquired:  
Loans 568,358us-gaap_BusinessCombinationAcquiredReceivablesFairValue
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
Intangible assets 15,091us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
Premises and equipment 19,358us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
Other assets 22,023tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
Cash and cash equivalents 89,990us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
Securities 160,450tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedMarketableSecurities
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
FHLB and Federal Reserve Bank stock 4,507tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRestrictedInvestments
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
Other real estate owned 11,285tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherRealEstate
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
Bank-owned life insurance 28,435tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsBankLifeInsurance
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
Deferred income taxes 17,237tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
Total Assets Acquired 936,734us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
Liabilities assumed:  
Customer deposits 793,256us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialLiabilities
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
Customer repurchase agreements 19,927tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedSecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
Senior secured note 11,858tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedSeniorSecuredNote
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
Junior subordinated debentures 24,120tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedJuniorSubordinatedDebentures
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
Federal Home Loan Bank advances 5,003tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFederalHomeLoanBankAdvances
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
Accrued interest and dividends payable 7,282tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInterestAndDividendsPayable
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
Other liabilities 7,988us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
Total liabilities 869,434us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
Fair value of net assets acquired 67,300us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
Cash paid to NBI common and preferred shareholders 15,277us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
Liabilities:  
Consideration paid 58,286us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
Bargain Purchase Gain (9,014)us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
NBI Acquisition | Series B Preferred Stock  
Liabilities:  
Stock Issued or Assumed 5,196us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
NBI Acquisition | Common Stock  
Liabilities:  
Stock Issued or Assumed 11,916us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
NBI Acquisition | Preferred Stock  
Liabilities:  
Stock Issued or Assumed $ 25,897us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember