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COVID-19 and CARES Act Loan Activities (Details) - COVID-19 [Member] $ in Millions | 3 Months Ended
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Mar. 31, 2021 USD ($) Loan
Outstanding [Member] |
COVID-19 [Abstract] |
Number of loan deferrals | Loan | 226
Amount of loan deferrals | $ 81.8
Period of loan deferrals | 90 days
Paycheck Protection Program [Member] |
COVID-19 [Abstract] |
Number of loans closed | Loan | 2,962
Amount of loans closed | $ 277.0
Number of loans forgiven by SBA | Loan | 1,563
Amount of loans forgiven by SBA | $ 117.2
Amount of loans paid off or forgiven | $ 98.1
New Paycheck Protection Program [Member] |
COVID-19 [Abstract] |
Number of loans closed | Loan | 1,857
Amount of loans closed | $ 99.1
Commercial Loan [Member] |
COVID-19 [Abstract] |
Number of loan deferrals | Loan | 73
Amount of loan deferrals | $ 73.8
Commercial Loan [Member] | Four Times [Member] |
COVID-19 [Abstract] |
Number of loan deferrals | Loan | 20
Amount of loan deferrals | $ 40.5
Commercial Loan [Member] | Five Times [Member] |
COVID-19 [Abstract] |
Number of loan deferrals | Loan | 2
Amount of loan deferrals | $ 10.6
Residential Loan [Member] |
COVID-19 [Abstract] |
Number of loan deferrals | Loan | 83
Amount of loan deferrals | $ 6.5
Consumer Loan [Member] |
COVID-19 [Abstract] |
Number of loan deferrals | Loan | 70
Amount of loan deferrals | $ 1.5

X
- Definition Represents the amount of deferred loans. + References No definition available. + Details
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Namespace Prefix: | ctbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of loans forgiven by the Small Business Administration (SBA). + References No definition available. + Details
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Namespace Prefix: | ctbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of loans in PPP loans were paid off or forgiven. + References No definition available. + Details
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Namespace Prefix: | ctbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the number of deferred loans. + References No definition available. + Details
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Namespace Prefix: | ctbi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of loans closed under Payment Protection Program (PPP). + References No definition available. + Details
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Namespace Prefix: | ctbi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | ctbi_PeriodOfLoanDeferrals
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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Data Type: | xbrli:stringItemType
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis=ctbi_SmallBusinessAdministrationSBACARESActPaycheckProtectionProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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- Details
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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