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Summary of Significant Accounting Policies (Details)	3 Months Ended
	Mar. 31, 2014 Quarter Payment
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
Historical loan loss review period (in quarters)	12
Other real estate owned [Abstract]
Other real estate owned frequency of period reviews minimum	12 months
Other real estate owned typical frequency of period reviews maximum	18 months
Maximum frequency of periodic reviews of real estate owned generally	24 months
Foreclosure proceedings initiated	120 days

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

Foreclosure proceedings initiated

+ References

No definition available.

+ Details

Name:	ctbi_ForeclosureProceedingsInitiated
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 frequency of periodic reviews for appraisals on foreclosed properties and other real estate owned generally.

+ References

No definition available.

+ Details

Name:	ctbi_MaximumFrequencyOfPeriodicReviewsOfRealEstateOwnedGenerally
Namespace Prefix:	ctbi_
Data Type:	xbrli:durationItemType
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_OtherRealEstateOwnedFrequencyOfPeriodReviewsMaximum
Namespace Prefix:	ctbi_
Data Type:	xbrli:durationItemType
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_OtherRealEstateOwnedFrequencyOfPeriodReviewsMinimum
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

X

- Details

Name:	us-gaap_OtherRealEstateAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration