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Securities - Schedule of Amortized Cost and Estimated Fair Value of Securities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Available for Sale, Amortized Cost
Due in one year or less, Amortized Cost	$ 1,390us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
Due from one year to five years, Amortized Cost	93,217us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
Due from five years to ten years, Amortized Cost	17,285us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
Due after ten years, Amortized Cost	1,583us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
Available for Sale, with single maturity date, Amortized Cost	113,475us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis
Available for Sale, Amortized Cost	160,539us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Available for Sale, Fair Value
Due in one year or less, Fair Value	1,392us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Due from one year to five years, Fair Value	93,637us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Due from five years to ten years, Fair Value	17,671us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Due after ten years, Fair Value	1,638us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
Available for Sale, without single maturity date, Fair Value	114,338us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate
Available for Sale, Fair Value	162,024us-gaap_AvailableForSaleSecuritiesDebtSecurities
Held to Maturity, Amortized Cost
Due in one year or less, Amortized Cost	225us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount
Due from one year to five years, Amortized Cost	520us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount
Held to Maturity, with single maturity date, Amortized Cost	745us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis
Held to maturity securities, Amortized Cost	745us-gaap_HeldToMaturitySecurities	743us-gaap_HeldToMaturitySecurities
Held to Maturity, Fair Value
Due in one year or less, Fair Value	225us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue
Due from one year to five years, Fair Value	525us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Held to Maturity, with single maturity date, Fair Value	750us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue
Held to maturity securities, Fair Value	750us-gaap_HeldToMaturitySecuritiesFairValue	745us-gaap_HeldToMaturitySecuritiesFairValue
Mortgage-backed Securities, Residential
Available for Sale, Amortized Cost
Available for Sale, without single maturity date, Amortized Cost	28,298us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Available for Sale, Fair Value
Available for Sale, without single maturity date, Fair Value	28,878us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Asset Backed Securities
Available for Sale, Amortized Cost
Available for Sale, without single maturity date, Amortized Cost	18,559us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
Available for Sale, Fair Value
Available for Sale, without single maturity date, Fair Value	18,598us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
SBA Pooled Securities
Available for Sale, Amortized Cost
Available for Sale, without single maturity date, Amortized Cost	207us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = tbk_SbaPooledSecuritiesMember
Available for Sale, Fair Value
Available for Sale, without single maturity date, Fair Value	$ 210us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = tbk_SbaPooledSecuritiesMember

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of investment in available-for-sale debt securities with a single maturity date.

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