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Regulatory Matters - Additional Information (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
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	1.875%	1.25%

X

- Definition

Capital conservation buffer rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	tbk_
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Period Type:	duration

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- 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

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- 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

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- 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

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- References

No definition available.

+ Details

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