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Borrowings and Borrowing Capacity - Schedule of FHLB Advances (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Line Of Credit Facility [Line Items]    
Federal Home Loan Bank advances $ 3,000us-gaap_AdvancesFromFederalHomeLoanBanks $ 21,000us-gaap_AdvancesFromFederalHomeLoanBanks
TCB and TSB    
Line Of Credit Facility [Line Items]    
FHLB Advances, Borrowing capacity 107,361us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaximumAmountAvailable
/ dei_LegalEntityAxis
= tbk_TriumphCommunityBankAndTriumphSavingsBankSSBMember
131,300us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaximumAmountAvailable
/ dei_LegalEntityAxis
= tbk_TriumphCommunityBankAndTriumphSavingsBankSSBMember
Federal Home Loan Bank advances 3,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ dei_LegalEntityAxis
= tbk_TriumphCommunityBankAndTriumphSavingsBankSSBMember
21,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ dei_LegalEntityAxis
= tbk_TriumphCommunityBankAndTriumphSavingsBankSSBMember
FHLB Advances, Unused borrowing capacity $ 104,361us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds
/ dei_LegalEntityAxis
= tbk_TriumphCommunityBankAndTriumphSavingsBankSSBMember
$ 110,300us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds
/ dei_LegalEntityAxis
= tbk_TriumphCommunityBankAndTriumphSavingsBankSSBMember