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Subsequent Events (Details) - Subsequent Event [Member] - Flood [Member]	Jul. 28, 2022 County Branch
Subsequent Event [Abstract]
Number of counties severely impacted | County	5
Number of branches impacted by flooding | Branch	6

X

- Definition

Number of branch locations impacted by the flooding causing an interruption in service.

+ References

No definition available.

+ Details

Name:	ctbi_NumberOfBranchesImpactedByFlooding
Namespace Prefix:	ctbi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of counties in the company's service area that were severely impacted.

+ References

No definition available.

+ Details

Name:	ctbi_NumberOfCountiesSeverelyImpacted
Namespace Prefix:	ctbi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	ctbi_SubsequentEventAbstract
Namespace Prefix:	ctbi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=us-gaap_FloodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: