XML 127 R113.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Regulatory Matters - Additional Information (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Regulatory Capital Requirements [Abstract] |  |
Capital conservation buffer rate in 2016 | 0.625% |
Capital conservation buffer rate increase in 2017 | 0.625% |
Capital conservation buffer rate increase in 2018 | 0.625% |
Capital conservation buffer rate in 2019 | 2.50% |
Capital conservation buffer rate | 1.25% | 0.625%

X
- Definition Capital conservation buffer rate. + References No definition available. + Details
Name: | tbk_CapitalConservationBufferRate
Namespace Prefix: | tbk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Capital conservation buffer rate in year four. + References No definition available. + Details
Name: | tbk_CapitalConservationBufferRateInYearFour
Namespace Prefix: | tbk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Capital conservation buffer rate Increase in year three. + References No definition available. + Details
Name: | tbk_CapitalConservationBufferRateIncreaseInYearThree
Namespace Prefix: | tbk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Capital conservation buffer rate Increase in year two. + References No definition available. + Details
Name: | tbk_CapitalConservationBufferRateIncreaseInYearTwo
Namespace Prefix: | tbk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Initial capital conservation buffer rate. + References No definition available. + Details
Name: | tbk_CapitalConservationBufferRateInitial
Namespace Prefix: | tbk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_RegulatoryCapitalRequirementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration