Name:	tcbi_InterestBearingTimeDepositMaturitiesAfterYearFive
Namespace Prefix:	tcbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of interest bearing time deposits (including certificates of deposits, individual retirement accounts and open accounts) held by the entity with a remaining term of greater than four years but five years or less.

No definition available.

Name:	tcbi_InterestBearingTimeDepositMaturitiesYearFive
Namespace Prefix:	tcbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No definition available.

Name:	tcbi_InterestBearingTimeDepositMaturitiesYearFour
Namespace Prefix:	tcbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of interest bearing time deposits (including certificates of deposits, individual retirement accounts and open accounts) held by the entity with a remaining term of twelve months or less.

No definition available.

Name:	tcbi_InterestBearingTimeDepositMaturitiesYearOne
Namespace Prefix:	tcbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No definition available.

Name:	tcbi_InterestBearingTimeDepositMaturitiesYearThree
Namespace Prefix:	tcbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No definition available.

Name:	tcbi_InterestBearingTimeDepositMaturitiesYearTwo
Namespace Prefix:	tcbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The aggregate amount of interest bearing time deposits, including certificates of deposits, individual retirement accounts and open accounts.

No definition available.

Name:	tcbi_InterestBearingTimeDeposits
Namespace Prefix:	tcbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.