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Business Combinations and Divestitures - Summary of Fair Values of Assets Acquired and Liabilities Assumed (Parenthetical) (Details) | Oct. 06, 2017 USD ($)
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Independent Bank - Colorado Branches |
Business Acquisition [Line Items] |
Deposit premium | $ 6,771,000

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- Definition Aggregate deposit premium paid as consideration for acquisition. + References No definition available. + Details
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Namespace Prefix: | tbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=tbk_IndependentBankColoradoBranchesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |