Name:	ctbi_EmployeeBenefitPlanContributionVestingPercentage
Namespace Prefix:	ctbi_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

Employee benefit plan distribution of funds equal annual installments period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

No definition available.

Name:	ctbi_EmployeeBenefitPlanDistributionOfFundsEqualAnnualInstallmentsPeriod
Namespace Prefix:	ctbi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Maximum company matching percentage for deferred compensation contributions of participants compensation in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

No definition available.

Name:	ctbi_EmployeeBenefitPlanMaximumCompanyMatchingPercentageForDeferredCompensationContributionsOfParticipantsCompensation
Namespace Prefix:	ctbi_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	instant

Minimum age for distribution payments for the Plan.

No definition available.

Name:	ctbi_EmployeeBenefitPlanMinimumAgeForDistributionPaymentsForThePlan
Namespace Prefix:	ctbi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Minimum attained age required for employee to become eligible to participate in plan through salary deferral or for employer match (employee benefit plan (EBP)).

No definition available.

Name:	ctbi_EmployeeBenefitPlanMinimumAttainedAgeRequiredForAnEmployeeToBecomeEligibleToParticipateInThePlanThroughSalaryDeferralOrForEmployerMatch
Namespace Prefix:	ctbi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Minimum days of service required to be eligible to participate in plan through salary deferral.

No definition available.

Name:	ctbi_EmployeeBenefitPlanMinimumDaysOfServiceRequiredToBeEligibleToParticipateInPlanThroughSalaryDeferral
Namespace Prefix:	ctbi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Minimum Hours of Employment to be Eligible for Payment of Full Value of Plan Account (employee benefit plan (EBP)).

No definition available.

Name:	ctbi_EmployeeBenefitPlanMinimumHoursOfEmploymentToBeEligibleForPaymentOfFullValueOfPlanAccount
Namespace Prefix:	ctbi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Minimum number of hours of service required for an employee to become eligible for employer match in the plan. (employee benefit plan (EBP)).

No definition available.

Name:	ctbi_EmployeeBenefitPlanMinimumHoursOfServiceRequiredToBeEligibleForEmployerMatch
Namespace Prefix:	ctbi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Employee benefit plan Minimum number of consecutive months of employment to be eligible to participate in employer match, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

No definition available.

Name:	ctbi_EmployeeBenefitPlanMinimumMinimumNumberOfConsecutiveMonthsOfEmploymentToBeEligibleToParticipateInEmployerMatch
Namespace Prefix:	ctbi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The maximum extra money an employee is allowed to put into the plan each year as a catch-up contribution participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

No definition available.

Name:	ctbi_EmployeeBenefitPlanParticipantContributionMaximumAnnualCatchUpCompensationAmount
Namespace Prefix:	ctbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The age at which participants become eligible for contributions under employee benefit plan.

No definition available.

Name:	ctbi_EmployeeBenefitPlanParticipantMinimumAgeEligibleToMakeCatchUpContributions
Namespace Prefix:	ctbi_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

Minimum age to be eligible to participate in the plan in employee stock purchase, saving, or similar plan through salary deferral (employee benefit plan (EBP)).

No definition available.

Name:	ctbi_EmployeeBenefitPlanParticipantMinimumAgeToBeEligibleToParticipateInPlanThroughSalaryDeferral
Namespace Prefix:	ctbi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Age at which a participant attains normal retirement under the terms of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

No definition available.

Name:	ctbi_EmployeeBenefitPlanParticipantRetirementAge
Namespace Prefix:	ctbi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Employee vesting service number of plan years (employee benefit plan (EBP)).

No definition available.

Name:	ctbi_EmployeeBenefitPlanVestingServiceNumberOfPlanYears
Namespace Prefix:	ctbi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Indicates (true false) whether description of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) is published and made available.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

Name:	us-gaap-ebp_EmployeeBenefitPlanDescriptionAvailable
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:booleanItemType
Balance Type:	na
Period Type:	duration

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-SubTopic 205
-Topic 962
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

Name:	us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Percentage of employer matching contribution on eligible participant contribution to employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

Name:	us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Percentage of participant compensation eligible for employer matching contribution for participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

Name:	us-gaap-ebp_EmployeeBenefitPlanEmployerContributionParticipantCompensationMatchedPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Amount of plan asset, in forfeited nonvested account, no longer allocated to participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (j)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

Name:	us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccount
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of decrease in forfeited nonvested account of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) from reallocation to participant.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (j)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-04(5)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Name:	us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccountReallocatedToParticipant
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount of maximum pretax annual compensation that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), is permitted to contribute.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1