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Variable Interest Entities - Additional Information - (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 25, 2014	May 01, 2014	Aug. 04, 2014
Variable Interest Entity [Line Items]
Asset management fees	$ 989us-gaap_AssetManagementFees1
Collateralized Loan Obligation Funds
Variable Interest Entity [Line Items]
Asset management fees	989us-gaap_AssetManagementFees1 / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedLoanObligationsMember	0us-gaap_AssetManagementFees1 / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedLoanObligationsMember	0us-gaap_AssetManagementFees1 / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedLoanObligationsMember
Equity investments				2,450us-gaap_EquityMethodInvestments / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedLoanObligationsMember
Trinitas I | Collateralized Loan Obligation Funds
Variable Interest Entity [Line Items]
Securities issued at face value					400,000us-gaap_DebtInstrumentFaceAmount / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = tbk_TrinitasCollateralizedLoanObligationILtdMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedLoanObligationsMember
Trinitas II | Collateralized Loan Obligation Funds
Variable Interest Entity [Line Items]
Securities issued at face value						416,000us-gaap_DebtInstrumentFaceAmount / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = tbk_TrinitasCollateralizedLoanObligationIILtdMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedLoanObligationsMember
Trinitas III | Collateralized Loan Obligation Funds
Variable Interest Entity [Line Items]
Equity investments	$ 2,450us-gaap_EquityMethodInvestments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = tbk_TrinitasCollateralizedLoanObligationIIILtdMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedLoanObligationsMember			$ 27,550us-gaap_EquityMethodInvestments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = tbk_TrinitasCollateralizedLoanObligationIIILtdMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedLoanObligationsMember

X

- Definition

Amount of fixed fee revenue for the management of an investment fund portfolio. Excludes investment advisory, distribution and servicing, and performance fees.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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X

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570

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Period Type:	instant

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- Details

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- Details

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Namespace Prefix:
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- Details

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- Details

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