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COVID-19 and CARES Act Loan Activities (Details) - COVID-19 [Member] $ in Millions | 9 Months Ended
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Sep. 30, 2021 USD ($) Loan
Outstanding [Member] |
COVID-19 [Abstract] |
Number of loan deferrals | Loan | 27
Amount of loan deferrals | $ | $ 15.8
Period of loan deferrals | 90 days
Paycheck Protection Program [Member] |
COVID-19 [Abstract] |
Number of loans closed | Loan | 6,312
Amount of loans closed | $ | $ 401.3
Number of loans forgiven by SBA | Loan | 4,730
Amount of loans forgiven by SBA | $ | $ 297.7
Consolidated Appropriations Act 2021 (Second Round) [Member] |
COVID-19 [Abstract] |
Number of loans closed | Loan | 3,352
Amount of loans closed | $ | $ 124.3
Number of loans forgiven by SBA | Loan | 1,877
Amount of loans forgiven by SBA | $ | $ 35.9
Commercial Loan [Member] |
COVID-19 [Abstract] |
Number of loan deferrals | Loan | 6
Amount of loan deferrals | $ | $ 14.3
Residential Loan [Member] |
COVID-19 [Abstract] |
Number of loan deferrals | Loan | 17
Amount of loan deferrals | $ | $ 1.4
Consumer Loan [Member] |
COVID-19 [Abstract] |
Number of loan deferrals | Loan | 4
Amount of loan deferrals | $ | $ 0.1

X
- Definition Represents the amount of deferred loans. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Amount of loans closed under Payment Protection Program (PPP). + References No definition available. + Details
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Namespace Prefix: | ctbi_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant

X
- Definition Amount of loans forgiven by the Small Business Administration (SBA). + References No definition available. + Details
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- Definition Represents the number of deferred loans. + References No definition available. + Details
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Namespace Prefix: | ctbi_
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- Definition Number of loans closed under Payment Protection Program (PPP). + References No definition available. + Details
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- Definition Number of loans forgiven by the Small Business Administration (SBA). + References No definition available. + Details
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Namespace Prefix: | ctbi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Refers to the period of loan deferrals, 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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- Details
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Namespace Prefix: |
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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