Loans, Collateral Dependent Loans Evaluated Individually by Segment (Details) - Commercial [Member] $ in Thousands	12 Months Ended
Dec. 31, 2023 USD ($) Loan	Dec. 31, 2022 USD ($) Loan
Collateral Pledged [Member]
Collateral Dependent Loans by Segment [Abstract]
Number of Loans \| Loan	16	15
Recorded Balance	$ 39,185	$ 32,598
Specific Allowance	$ 250	$ 1,200
Hotel/Motel [Member] \| Collateral Pledged [Member]
Collateral Dependent Loans by Segment [Abstract]
Number of Loans \| Loan	3	1
Recorded Balance	$ 6,810	$ 1,168
Specific Allowance	$ 0	$ 0
Commercial Real Estate Residential [Member] \| Collateral Pledged [Member]
Collateral Dependent Loans by Segment [Abstract]
Number of Loans \| Loan	2	4
Recorded Balance	$ 5,080	$ 7,786
Specific Allowance	$ 0	$ 0
Commercial Real Estate Nonresidential [Member] \| Collateral Pledged [Member]
Collateral Dependent Loans by Segment [Abstract]
Number of Loans \| Loan	9	8
Recorded Balance	$ 21,637	$ 14,718
Specific Allowance	$ 250	$ 200
Commercial Other [Member] \| Collateral Pledged [Member]
Collateral Dependent Loans by Segment [Abstract]
Number of Loans \| Loan	2	2
Recorded Balance	$ 5,658	$ 8,926
Specific Allowance	$ 0	$ 1,000
Commercial Other [Member] \| Accounts Receivable, Equipment, and Inventory [Member]
Collateral Dependent Loans by Segment [Abstract]
Number of financing receivables collateralized \| Loan	2

Number of financial receivables individually evaluated for impairment.

No definition available.

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

- Definition

Amount of allowance for credit losses related to financing receivables that were individually evaluated for impairment.

+ References

No definition available.

+ Details

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Namespace Prefix:	ctbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	ctbi_FinancingReceivablesCollateralDependentLoansBySegmentAbstract
Namespace Prefix:	ctbi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of financing receivables collateralized by various chattel.

+ References

No definition available.

+ Details

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

- Definition

The balance of financing receivables that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11C
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-11C

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 6.L(5)(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480418/310-10-S99-4

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_CollateralAxis=us-gaap_CollateralPledgedMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ctbi_HotelMotelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ctbi_CommercialRealEstateResidentialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ctbi_CommercialRealEstateNonresidentialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ctbi_CommercialOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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Namespace Prefix:
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