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Business Combinations and Divestitures - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Jul. 11, 2014
Dec. 31, 2013
Oct. 15, 2013
Business Acquisition [Line Items]          
Net cash proceeds   $ 57,409us-gaap_ProceedsFromDivestitureOfBusinesses      
Deposits 1,105,624us-gaap_Deposits 1,105,624us-gaap_Deposits   1,044,854us-gaap_Deposits  
Pre-tax gain 12,619us-gaap_GainLossOnSaleOfBusiness 12,619us-gaap_GainLossOnSaleOfBusiness      
Loans 45,334us-gaap_BusinessCombinationAcquiredReceivablesFairValue 45,334us-gaap_BusinessCombinationAcquiredReceivablesFairValue      
Cash paid   49,482us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired      
Goodwill   1,921us-gaap_GoodwillAcquiredDuringPeriod      
Fair value of acquired loans not classified as PCI 41,680tbk_BusinessCombinationAcquiredReceivablesNotPCIFairValue 41,680tbk_BusinessCombinationAcquiredReceivablesNotPCIFairValue      
Senior notes, outstanding balance 11,630us-gaap_SeniorNotes 11,630us-gaap_SeniorNotes   12,573us-gaap_SeniorNotes  
THE National Bank          
Business Acquisition [Line Items]          
Business acquisition, percentage of voting interests acquired         100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_StatementBusinessSegmentsAxis
= tbk_TheNationalBankMember
TCB          
Business Acquisition [Line Items]          
Net cash proceeds     57,409us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_BusinessAcquisitionAxis
= tbk_TriumphCommunityBankMember
   
Deposits     36,326us-gaap_Deposits
/ us-gaap_BusinessAcquisitionAxis
= tbk_TriumphCommunityBankMember
   
Carrying amount of Loans Sold     78,071tbk_LoansOfDisposalGroupNotDiscontinuedOperation
/ us-gaap_BusinessAcquisitionAxis
= tbk_TriumphCommunityBankMember
   
Pre-tax gain     12,619us-gaap_GainLossOnSaleOfBusiness
/ us-gaap_BusinessAcquisitionAxis
= tbk_TriumphCommunityBankMember
   
NBI          
Business Acquisition [Line Items]          
Business acquisition, percentage of voting interests acquired         100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= tbk_NationalBankSharesIncorporationMember
Business acquisition, bargain purchase gain       9,014us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount
/ us-gaap_BusinessAcquisitionAxis
= tbk_NationalBankSharesIncorporationMember
 
Senior notes, outstanding balance 11,858us-gaap_SeniorNotes
/ us-gaap_BusinessAcquisitionAxis
= tbk_NationalBankSharesIncorporationMember
11,858us-gaap_SeniorNotes
/ us-gaap_BusinessAcquisitionAxis
= tbk_NationalBankSharesIncorporationMember
     
NBI | Convertible Notes Payable          
Business Acquisition [Line Items]          
Senior notes, outstanding balance $ 3,640us-gaap_SeniorNotes
/ us-gaap_BusinessAcquisitionAxis
= tbk_NationalBankSharesIncorporationMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
$ 3,640us-gaap_SeniorNotes
/ us-gaap_BusinessAcquisitionAxis
= tbk_NationalBankSharesIncorporationMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember