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Loans and Allowance for Credit Losses - Summary of Loans Modified for Borrowers Impacted by COVID-19 (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Receivables [Abstract] |  |
Modified during period | $ 10,801 | $ 628,022

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- Definition Amount of loans modified during the period with payment deferrals granted in accordance with the CARES Act and regulatory guidance. + References No definition available. + Details
Name: | tbk_FinancingReceivablesPaymentDeferralModificationsModifiedDuringPeriod
Namespace Prefix: | tbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration