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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 | $ 989 us-gaap_AssetManagementFees1 |  |  |  |  |
Collateralized Loan Obligation Funds |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Asset management fees | 989 us-gaap_AssetManagementFees1 / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedLoanObligationsMember | 0 us-gaap_AssetManagementFees1 / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedLoanObligationsMember | 0 us-gaap_AssetManagementFees1 / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedLoanObligationsMember |  |  |
Equity investments |  |  |  | 2,450 us-gaap_EquityMethodInvestments / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedLoanObligationsMember |  |
Trinitas I | Collateralized Loan Obligation Funds |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Securities issued at face value |  |  |  |  | 400,000 us-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 |  |  |  |  |  | 416,000 us-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 | $ 2,450 us-gaap_EquityMethodInvestments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = tbk_TrinitasCollateralizedLoanObligationIIILtdMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedLoanObligationsMember |  |  | $ 27,550 us-gaap_EquityMethodInvestments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = tbk_TrinitasCollateralizedLoanObligationIIILtdMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedLoanObligationsMember |  |

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- 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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- 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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- 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 + Details
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- Details
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