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Off-Balance Sheet Loan Commitments - Additional Information (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |
Overdraft protection available amounts | $ 3,087,000 | $ 2,397,000
Other Liabilities |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |
Reserve for loan and lease losses on off-balance sheet lending-related commitments | $ 538,000 | $ 501,000

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- Definition Overdraft protection commitment amount. + References No definition available. + Details
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- Definition Reserve for loan and lease losses on off-balance sheet lending-related commitments. + 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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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |