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Equity and Noncontrolling Interests - Additional Information (Details) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended |  |
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Dec. 31, 2014 | Nov. 13, 2014 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 28, 2009 | Dec. 31, 2011 | Jun. 15, 2014
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Par value per share | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare |  | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  |
Common stock, issued additional |  | $ 12.00 us-gaap_SaleOfStockPricePerShare |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from initial public offering |  | $ 92,460,000 us-gaap_ProceedsFromIssuanceInitialPublicOffering |  |  |  |  |  |  |  |  | $ 83,767,000 us-gaap_ProceedsFromIssuanceInitialPublicOffering |  |  |  |  |
Net proceeds after underwriting discounts and offering expenses |  | 83,767,000 us-gaap_SaleOfStockConsiderationReceivedOnTransaction |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock outstanding | 252,256 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber |  | 252,256 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber |  |  |  |  |  |  |  | 252,256 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber |  |  |  |  |
Exercise price of warrants, per share |  |  |  |  |  |  |  |  |  |  |  |  | $ 11.58 tbk_WarrantHasExercisePriceOfPerShare |  |  |
Maximum time to receive shares at special events |  |  |  |  |  |  |  |  |  |  |  | 30 days |  |  |  |
Company’s redemption rights modified date |  |  |  |  |  |  |  |  |  |  |  |  | Oct. 15, 2018 |  |  |
Federal bank regulatory effective date |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 01, 2015 |  |  |
Dividend rate - floor |  |  |  |  |  |  |  |  |  |  |  | 8.00%us-gaap_PreferredStockDividendRatePercentage |  |  |  |
Stockholders equity noncontrolling interest | 237,509,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  | 237,509,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  | 160,597,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  | 237,509,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 160,597,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 63,474,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  | 40,279,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |
Stock issuance, net of costs |  |  |  |  |  |  |  |  |  |  | 6,000 us-gaap_StockIssuedDuringPeriodValueNewIssues | 42,402,000 us-gaap_StockIssuedDuringPeriodValueNewIssues | 1,000,000 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |
Total unpaid dividend of NBI |  |  | 197,000 us-gaap_DividendsPreferredStock | 195,000 us-gaap_DividendsPreferredStock | 196,000 us-gaap_DividendsPreferredStock | 192,000 us-gaap_DividendsPreferredStock | 179,000 us-gaap_DividendsPreferredStock | 95,000 us-gaap_DividendsPreferredStock | 91,000 us-gaap_DividendsPreferredStock | 356,000 us-gaap_DividendsPreferredStock | 780,000 us-gaap_DividendsPreferredStock | 721,000 us-gaap_DividendsPreferredStock |  |  |  |
Preferred stock redemption value | 26,200,000 tbk_RepurchaseAndRedemptionOfPreferredStock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NBI Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total unpaid dividend of NBI |  |  |  |  |  |  |  |  |  |  |  | 4,343,000 us-gaap_DividendsPreferredStock / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance, net of cost (in shares) |  |  |  |  |  |  |  |  |  |  | 444 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,672,115 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 86,356 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Exchange offer (in shares) |  |  |  |  |  |  |  |  |  |  |  | 545,069 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Stockholders equity noncontrolling interest | 180,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 180,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 98,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 180,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 98,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 46,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 1,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
Stock issuance, net of costs |  |  |  |  |  |  |  |  |  |  |  | 37,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders equity noncontrolling interest |  |  |  |  |  |  | 26,997,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  | 26,997,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 6,962,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |
Series T-1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate - floor |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = tbk_SeriesTOneMember |  |
Number of shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,664 us-gaap_PreferredStockSharesIssued / dei_LegalEntityAxis = tbk_SeriesTOneMember |  |
Liquidation preference per share |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 us-gaap_PreferredStockLiquidationPreference / dei_LegalEntityAxis = tbk_SeriesTOneMember |  |
Stock issuance, net of costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,664,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / dei_LegalEntityAxis = tbk_SeriesTOneMember |  |
Series T-2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,233 us-gaap_PreferredStockSharesIssued / dei_LegalEntityAxis = tbk_SeriesTTwoMember |  |
Preferred Stock - Series A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate |  |  |  |  |  |  |  |  |  |  | Prime + 2% | Prime + 2% |  |  |  |
Dividend rate |  |  |  |  |  |  |  |  |  |  | 8.00%tbk_DividendRate / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 8.00%tbk_DividendRate / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |
Conversion ratio - preferred to common |  |  |  |  |  |  |  |  |  |  | 6.94008%tbk_PreferredStockToCommonStockConversionRatio / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |
Exchange offer (in shares) |  |  |  |  |  |  |  |  |  |  |  | (4,500)us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |
Stockholders equity noncontrolling interest | 4,550,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  | 4,550,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  | 4,550,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  | 4,550,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 4,550,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 5,000,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |
Number of shares issued | 45,500 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  | 45,500 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  | 45,500 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  | 45,500 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 45,500 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |
Liquidation preference per share | $ 100 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  | $ 100 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  | $ 100 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  | $ 100 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | $ 100 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate |  |  |  |  |  |  |  |  |  |  | 8.00%tbk_DividendRate / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 8.00%tbk_DividendRate / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Conversion ratio - preferred to common |  |  |  |  |  |  |  |  |  |  | 6.94008%tbk_PreferredStockToCommonStockConversionRatio / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |
Stockholders equity noncontrolling interest | 5,196,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  | 5,196,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  | 5,196,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  | 5,196,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 5,196,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Number of shares issued | 51,956 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  | 51,956 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  | 51,956 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  | 51,956 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 51,956 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Liquidation preference per share | $ 100 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  | $ 100 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  | $ 100 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  | $ 100 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | $ 100 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Class B Units | Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders equity noncontrolling interest |  |  |  |  |  |  | 1,100,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = tbk_ClassBUnitsMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  | 1,100,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = tbk_ClassBUnitsMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |
Class B Units | Triumph Commercial Finance Llc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange offer (in shares) |  |  |  |  |  |  |  |  |  |  |  | 58,620 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / dei_LegalEntityAxis = tbk_TriumphCommercialFinanceLlcMember / us-gaap_StatementClassOfStockAxis = tbk_ClassBUnitsMember |  |  |  |
Dividend rate - floor |  |  |  |  |  |  |  |  |  |  |  | 8.00%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = tbk_TriumphCommercialFinanceLlcMember / us-gaap_StatementClassOfStockAxis = tbk_ClassBUnitsMember |  |  |  |
Preferred stock, dividend payment rate, variable |  |  |  |  |  |  |  |  |  |  |  | 2.00%tbk_PreferredStockDividendBasisSpreadOnVariableRate / dei_LegalEntityAxis = tbk_TriumphCommercialFinanceLlcMember / us-gaap_StatementClassOfStockAxis = tbk_ClassBUnitsMember |  |  |  |
Redeemable noncontrolling interest, units outstanding (in Shares) |  |  |  |  |  |  | 11,000 tbk_RedeemableNoncontrollingInterestUnitsOutstanding / dei_LegalEntityAxis = tbk_TriumphCommercialFinanceLlcMember / us-gaap_StatementClassOfStockAxis = tbk_ClassBUnitsMember |  |  |  |  | 11,000 tbk_RedeemableNoncontrollingInterestUnitsOutstanding / dei_LegalEntityAxis = tbk_TriumphCommercialFinanceLlcMember / us-gaap_StatementClassOfStockAxis = tbk_ClassBUnitsMember |  |  |  |
Preferred stock, liquidation preference, value |  |  |  |  |  |  | 100 us-gaap_PreferredStockLiquidationPreferenceValue / dei_LegalEntityAxis = tbk_TriumphCommercialFinanceLlcMember / us-gaap_StatementClassOfStockAxis = tbk_ClassBUnitsMember |  |  |  |  | 100 us-gaap_PreferredStockLiquidationPreferenceValue / dei_LegalEntityAxis = tbk_TriumphCommercialFinanceLlcMember / us-gaap_StatementClassOfStockAxis = tbk_ClassBUnitsMember |  |  |  |
Redemption of non cumulative non-voting shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,000 tbk_RedemptionOfNonCumulativeShares / dei_LegalEntityAxis = tbk_TriumphCommercialFinanceLlcMember / us-gaap_StatementClassOfStockAxis = tbk_ClassBUnitsMember
Redemption price per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 102 us-gaap_TemporaryEquityRedemptionPricePerShare / dei_LegalEntityAxis = tbk_TriumphCommercialFinanceLlcMember / us-gaap_StatementClassOfStockAxis = tbk_ClassBUnitsMember
Stock issuance, net of costs |  |  |  |  |  |  |  |  |  |  |  |  | 3,750,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / dei_LegalEntityAxis = tbk_TriumphCommercialFinanceLlcMember / us-gaap_StatementClassOfStockAxis = tbk_ClassBUnitsMember |  |  |
Total unpaid dividend of NBI |  |  |  |  |  |  |  |  |  |  | 63,000 us-gaap_DividendsPreferredStock / dei_LegalEntityAxis = tbk_TriumphCommercialFinanceLlcMember / us-gaap_StatementClassOfStockAxis = tbk_ClassBUnitsMember | 209,000 us-gaap_DividendsPreferredStock / dei_LegalEntityAxis = tbk_TriumphCommercialFinanceLlcMember / us-gaap_StatementClassOfStockAxis = tbk_ClassBUnitsMember |  |  |  |
Class B Units | Triumph Commercial Finance Llc | Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance, net of costs |  |  |  |  |  |  |  |  |  |  |  |  | 3,750,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / dei_LegalEntityAxis = tbk_TriumphCommercialFinanceLlcMember / us-gaap_StatementClassOfStockAxis = tbk_ClassBUnitsMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |
Series T-1 and T-2 | Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders equity noncontrolling interest |  |  |  |  |  |  | 25,897,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = tbk_SeriesTOneAndTTwoMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  | 25,897,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = tbk_SeriesTOneAndTTwoMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |
NBI Senior Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidation preference per share |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = tbk_NBISeniorPreferredStockMember |  |
NBI Senior Preferred Stock | Series T-2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate - floor |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.00%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = tbk_SeriesTTwoMember / us-gaap_StatementClassOfStockAxis = tbk_NBISeniorPreferredStockMember |  |
Stock issuance, net of costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,233,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / dei_LegalEntityAxis = tbk_SeriesTTwoMember / us-gaap_StatementClassOfStockAxis = tbk_NBISeniorPreferredStockMember |  |
Warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued to Triumph Consolidated Cos LLC |  |  |  |  |  |  |  |  |  |  |  |  | 259,067 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_WarrantMember |  |  |
IPO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance, net of cost (in shares) |  | 6,700,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Par value per share |  | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, issued additional |  | $ 12.00 us-gaap_SaleOfStockPricePerShare / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from initial public offering |  | 80,400,000 us-gaap_ProceedsFromIssuanceInitialPublicOffering / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance, net of costs |  |  |  |  |  |  |  |  |  |  | 83,767,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |  |  |  |  |
IPO | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance, net of cost (in shares) |  |  |  |  |  |  |  |  |  |  | 7,705,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |  |  |  |  |
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Overallotment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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