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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, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Assets measured-nonrecurring basis [Abstract] |  |  |  |  |
Collateral dependent loans | $ 7,347 |  | $ 7,347 |  | $ 8,310
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 adjustment |  |  | $ 1,800 | $ 0 | 100
Nonrecurring [Member] | Fair Value [Member] |  |  |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |  |  |
Collateral dependent loans | 7,347 |  | 7,347 |  | 8,310
Other real estate owned | 148 |  | 148 |  | 731
Other real estate owned fair value disclosure adjustment | 65 | $ 6 |  |  | 63
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 |  | 0 |  | 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 |  | 0 |  | 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 | 7,347 |  | 7,347 |  | 8,310
Other real estate owned | $ 148 |  | $ 148 |  | $ 731

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

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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

X
- 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_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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 during the period. + References No definition available. + Details
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Namespace Prefix: | ctbi_
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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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Namespace Prefix: | ctbi_
Data Type: | xbrli:durationItemType
Balance Type: | na
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_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

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