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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
	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