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Off-Balance Sheet Loan Commitments - Additional Information (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Overdraft protection available amounts	$ 2,973,000	$ 2,397,000
Other Liabilities
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Liability for loan and lease losses on off-balance sheet lending-related commitments	$ 387,000	$ 501,000

X

- Definition

Liability 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

X

- Definition

Overdraft protection commitment amount.

+ References

No definition available.

+ Details

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Namespace Prefix:	tbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: