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COVID-19 and CARES Act Loan Activities (Details) - COVID-19 [Member] $ in Millions | 6 Months Ended
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Jun. 30, 2021 USD ($) Loan
Outstanding [Member] |
COVID-19 [Abstract] |
Number of loan deferrals | Loan | 60
Amount of loan deferrals | $ 28.6
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
Amount of loans forgiven by SBA | 217.2
PPP Extension under Consolidated Appropriations Act 2021 [Member] |
COVID-19 [Abstract] |
Amount of loans closed | $ 124.3
Commercial Loan [Member] |
COVID-19 [Abstract] |
Number of loan deferrals | Loan | 21
Amount of loan deferrals | $ 26.0
Residential Loan [Member] |
COVID-19 [Abstract] |
Number of loan deferrals | Loan | 29
Amount of loan deferrals | $ 2.4
Consumer Loan [Member] |
COVID-19 [Abstract] |
Number of loan deferrals | Loan | 10
Amount of loan deferrals | $ 0.2

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

X
- Definition Represents the number of deferred loans. + References No definition available. + Details
Name: | ctbi_FinancingReceivableNumberOfDeferredLoans
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 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

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

X
- Details
Name: | us-gaap_UnusualOrInfrequentItemAxis=ctbi_COVID19Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationNameAxis=ctbi_LoanDeferralsOutstandingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |