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

X

- Definition

Aggregate deposit premium paid as consideration for acquisition.

+ References

No definition available.

+ Details

Name:	tbk_AggregateDepositPremium
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

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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