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Subsequent Events (Details) - Subsequent Event [Member] - Flood [Member] | Jul. 28, 2022 County Branch
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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

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- 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: |