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Summary of Significant Accounting Policies (Details) | 3 Months Ended
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Mar. 31, 2013
Significant Accounting Policies details [Line Items] |
Charge off threshold for unsecured commercial loans considered uncollectible | 90 days
Charge off threshold for closed-end consumer loans and uncollectible loans | 120 days
Number of monthly payments before loan charge off | 5
Minimum [Member] |
Significant Accounting Policies details [Line Items] |
Historical loan loss review period (in quarters) | 4
Other real estate owned frequency of period reviews | 24 months
Maximum [Member] |
Significant Accounting Policies details [Line Items] |
Historical loan loss review period (in quarters) | 8
Other real estate owned frequency of period reviews | 12 months

X
- Definition The maximum number of days that a closed-end loan (excluding conventional 1-4 family residential loans and installment and revolving loans secured by real estate) may be delinquent before being charged-off. If a loan is considered uncollectable, it is charged off earlier. + References No definition available. + Details
Name: | ctbi_ChargeOffThresholdForClosedEndConsumerLoansAndUncollectibleLoans
Namespace Prefix: | ctbi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of quarters over which historical loss rates are generally reviewed. + References No definition available. + Details
Name: | ctbi_HistoricalLoanLossReviewPeriod
Namespace Prefix: | ctbi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The maximum number of payments that a closed-end loan (excluding conventional 1-4 family residential loans and installment and revolving loans secured by real estate) may be delinquent before being charged-off. If a loan is considered uncollectable, it is charged off earlier. + References No definition available. + Details
Name: | ctbi_NumberOfMonthlyPaymentsBeforeLoanChargeOff
Namespace Prefix: | ctbi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The frequency of periodic reviews for appraisals on foreclosed properties and other real estate owned. + References No definition available. + Details
Name: | ctbi_OtherRealEstateOwnedFrequencyOfPeriodReviews
Namespace Prefix: | ctbi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ctbi_SignificantAccountingPoliciesDetailsLineItems
Namespace Prefix: | ctbi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of days for unsecured commercial loans considered to be uncollectible before they are written off. + References No definition available. + Details
Name: | ctbi_UnsecuredCommercialLoansThresholdForWriteoffs
Namespace Prefix: | ctbi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration