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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

X

- Definition

Fair value of receivables acquired that were not otherwise classified as PCI.

+ References

No definition available.

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Loans of disposal group not discontinued operation.

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the fair value of the receivables acquired, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

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- Definition

In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity.

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment.

+ References

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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