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Regulatory Matters - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Regulatory Capital Requirements [Abstract] |  |
Capital conservation buffer rate in 2016 | 0.625% |
Capital conservation buffer rate increase in 2017 | 0.625% |
Capital conservation buffer rate increase in 2018 | 0.625% |
Capital conservation buffer rate in 2019 | 2.50% |
Capital conservation buffer rate | 1.875% | 1.25%

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- Definition Capital conservation buffer rate. + References No definition available. + Details
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- Definition Capital conservation buffer rate in year four. + References No definition available. + Details
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Namespace Prefix: | tbk_
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Balance Type: | na
Period Type: | instant

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- Definition Capital conservation buffer rate Increase in year three. + References No definition available. + Details
Name: | tbk_CapitalConservationBufferRateIncreaseInYearThree
Namespace Prefix: | tbk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Capital conservation buffer rate Increase in year two. + References No definition available. + Details
Name: | tbk_CapitalConservationBufferRateIncreaseInYearTwo
Namespace Prefix: | tbk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Initial capital conservation buffer rate. + References No definition available. + Details
Name: | tbk_CapitalConservationBufferRateInitial
Namespace Prefix: | tbk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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