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Fair Value of Financial Assets and Liabilities, Fair Value Measurements of Assets Measured on Nonrecurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023 | Dec. 31, 2022
Assets measured-nonrecurring basis [Abstract] |  |  |
Collateral dependent loans |  |  | $ 2,703
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 |
Nonrecurring [Member] |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |
Collateral dependent loans | $ 0 | $ 0 |
Other real estate owned [Abstract] |  |  |
Other real estate owned, fair value adjustment | 124 | 188 | 152
Nonrecurring [Member] | Fair Value [Member] |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |
Collateral dependent loans |  |  | 2,703
Other real estate owned | 623 | 623 | 570
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Nonrecurring [Member] | Fair Value [Member] |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |
Collateral dependent loans |  |  | 0
Other real estate owned | 0 | 0 | 0
Significant Other Observable Inputs (Level 2) [Member] | Nonrecurring [Member] | Fair Value [Member] |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |
Collateral dependent loans |  |  | 0
Other real estate owned | 0 | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] | Nonrecurring [Member] | Fair Value [Member] |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |
Collateral dependent loans |  |  | 2,703
Other real estate owned | $ 623 | $ 623 | $ 570

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

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- Definition This element represents the fair value disclosure of collateral dependent loan receivable as presented on the statement of financial position. + References No definition available. + Details
Name: | ctbi_CollateralDependentLoansFairValueDisclosure
Namespace Prefix: | ctbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount at which an asset could be bought or sold in a current transaction between willing parties, that is, other than in a forced or liquidation sale. + References No definition available. + Details
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Namespace Prefix: | ctbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents other real estate owned at fair value. + References No definition available. + Details
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Namespace Prefix: | ctbi_
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Balance Type: | debit
Period Type: | instant

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- 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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Period Type: | duration

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- 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
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Namespace Prefix: | ctbi_
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Period Type: | duration

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- References No definition available. + Details
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