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Accounting Policies, Certificates of Deposit in Other Banks (Details) | 12 Months Ended
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Dec. 31, 2022
Certificates of Deposits in Other Banks [Abstract] |
Maturity period of certificates of deposit in other banks | 18 months

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- References No definition available. + Details
Name: | ctbi_CertificatesOfDepositsInOtherBanksAbstract
Namespace Prefix: | ctbi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Refers to maturity period of certificates of deposit in other banks, 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_MaturityPeriodOfCertificatesOfDepositInOtherBanks
Namespace Prefix: | ctbi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration