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Deposits - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deposits [Abstract]
Time deposits	$ 66,366tbk_TimeDepositsOverTwoHundredAndFiftyThousand	$ 93,552tbk_TimeDepositsOverTwoHundredAndFiftyThousand

X

- Definition

Time deposits with balances greater than $250,000.

+ References

No definition available.

+ Details

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

X

- Details

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