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

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- 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

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