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Accounting Policies, Other Real Estate Owned (Details) | 12 Months Ended
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Dec. 31, 2024
Minimum [Member] |
Other Real Estate Owned [Abstract] |
Typical frequency of periodic reviews | 12 months
Maximum [Member] |
Other Real Estate Owned [Abstract] |
Typical frequency of periodic reviews | 18 months
Frequency of periodic reviews in general | 24 months

X
- Definition The frequency of periodic reviews for appraisals on foreclosed properties and other real estate owned generally, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition The typical frequency of periodic reviews for appraisals on foreclosed properties and other real estate owned, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | ctbi_OtherRealEstateOwnedTypicalFrequencyOfPeriodReviews
Namespace Prefix: | ctbi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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