Loans, Collateral Dependent Loans Evaluated Individually by Segment (Details) - Commercial [Member] $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2024 USD ($) Loan	Jun. 30, 2023 USD ($) Loan	Dec. 31, 2023 USD ($) Loan
Collateral Pledged [Member]
Collateral Dependent Loans by Segment [Abstract]
Number of Loans \| Loan	15	13	16
Recorded balance	$ 48,873	$ 32,756	$ 39,185
Specific Allowance	$ 325	$ 0	$ 250
Hotel/Motel [Member] \| Collateral Pledged [Member]
Collateral Dependent Loans by Segment [Abstract]
Number of Loans \| Loan	2	2	3
Recorded balance	$ 5,654	$ 8,114	$ 6,810
Specific Allowance	$ 0	$ 0	$ 0
Commercial Real Estate Residential [Member] \| Collateral Pledged [Member]
Collateral Dependent Loans by Segment [Abstract]
Number of Loans \| Loan	0	3	2
Recorded balance	$ 0	$ 6,353	$ 5,080
Specific Allowance	$ 0	$ 0	$ 0
Commercial Real Estate Nonresidential [Member] \| Collateral Pledged [Member]
Collateral Dependent Loans by Segment [Abstract]
Number of Loans \| Loan	10	6	9
Recorded balance	$ 29,454	$ 11,704	$ 21,637
Specific Allowance	$ 325	$ 0	$ 250
Commercial Other [Member] \| Collateral Pledged [Member]
Collateral Dependent Loans by Segment [Abstract]
Number of Loans \| Loan	3	2	2
Recorded balance	$ 13,765	$ 6,585	$ 5,658
Specific Allowance	$ 0	$ 0	$ 0
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

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

- References

No definition available.

+ Details

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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

Amount of financing receivable individually evaluated for credit loss. Excludes financing receivable collectively evaluated for credit loss.

+ References

Reference 1: 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

Reference 2: 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

+ 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

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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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