XML 38 R19.htm IDEA: XBRL DOCUMENT v2.4.0.6

Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
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
Estimate change impact to provision for loan loss requirement in the most likely scenario	$ 3.2
Minimum [Member]
Significant Accounting Policies details [Line Items]
Historical loan loss review period (in quarters)	4
Other real estate owned frequency of period reviews	12 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	18 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 impact the change in experience ratio for historical loss rates had on the provision for loan loss requirement in the best case scenario.

+ References

No definition available.

+ Details

Name:	ctbi_EstimateChangeImpactToProvisionForLoanLossRequirementInMostLikelyScenario
Namespace Prefix:	ctbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

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:stringItemType
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