Weighted average interest rate of modified financing receivable.

No definition available.

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

- Definition

Weighted-average interest rate, after modification, of modified financing receivable.

+ References

No definition available.

+ Details

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

- Definition

Weighted-average interest rate, before modification, of modified financing receivable.

+ References

No definition available.

+ Details

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

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481933/310-10-55-12A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

+ Details

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

- Definition

Period of increase in weighted-average maturity of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

+ Details

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Balance Type:	na
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- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ctbi_CommercialRealEstateNonresidentialMember
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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Loans - Financial Effect of Modifications Made to Borrowers Experiencing Financial Difficulty (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Commercial Real Estate Nonresidential [Member] \| Interest Rate Reduction [Member]
Loans [Abstract]
Weighted-average contractual interest rate	2.50%		2.50%
Weighted-average contractual interest rate, pre-modification		7.50%		7.50%
Weighted-average contractual interest rate, post-modification		2.00%		2.10%
Commercial Real Estate Nonresidential [Member] \| Term Extension [Member]
Loans [Abstract]
Weighted-average term increased	5 years 7 months 6 days		1 year 1 month 6 days	6 months
Commercial Real Estate Nonresidential [Member] \| Combination - Term Extension and Payment Change Financial Impact [Member]
Loans [Abstract]
Weighted-average term increased			3 months 18 days
Commercial Other [Member] \| Term Extension [Member]
Loans [Abstract]
Weighted-average term increased	1 year 8 months 12 days	1 year 10 months 24 days	6 months	4 years 2 months 12 days
Commercial Other [Member] \| Combination - Term Extension and Interest Rate Reduction [Member]
Loans [Abstract]
Weighted-average term increased	15 years 3 months 18 days	10 months 24 days	7 years 3 months 18 days	6 years 6 months
Weighted-average contractual interest rate, pre-modification	8.50%	10.00%	8.70%	6.50%
Weighted-average contractual interest rate, post-modification	7.80%	8.00%	7.90%	8.00%
Real Estate Mortgage [Member] \| Interest Rate Reduction [Member]
Loans [Abstract]
Weighted-average contractual interest rate, pre-modification	5.30%	8.20%	5.30%	7.80%
Weighted-average contractual interest rate, post-modification	3.80%	3.80%	3.30%	4.40%
Real Estate Mortgage [Member] \| Term Extension [Member]
Loans [Abstract]
Weighted-average term increased	8 years 9 months 18 days	3 months 18 days	4 months 24 days	4 months 24 days
Real Estate Mortgage [Member] \| Combination - Term Extension and Interest Rate Reduction [Member]
Loans [Abstract]
Weighted-average term increased	7 years 4 months 24 days	5 years 8 months 12 days	6 years 9 months 18 days	5 years 3 months 18 days
Weighted-average contractual interest rate, pre-modification	3.50%	5.20%	3.40%	5.30%
Weighted-average contractual interest rate, post-modification	3.00%	3.80%	3.00%	3.70%
Real Estate Mortgage [Member] \| Combination - Interest Rate Reduction and Payment Change [Member]
Loans [Abstract]
Weighted-average contractual interest rate, pre-modification	7.10%		7.10%
Weighted-average contractual interest rate, post-modification	4.10%		4.10%
Real Estate Mortgage [Member] \| Combination - Term Extension and Payment Change Financial Impact [Member]
Loans [Abstract]
Weighted-average term increased			5 years
Consumer Direct [Member] \| Term Extension [Member]
Loans [Abstract]
Weighted-average term increased	1 year 9 months 18 days	3 months 18 days	6 months	3 months 18 days
Consumer Indirect [Member] \| Term Extension [Member]
Loans [Abstract]
Weighted-average term increased	3 years	9 months 18 days	6 months	10 months 24 days
Consumer Indirect [Member] \| Combination - Term Extension and Payment Change Financial Impact [Member]
Loans [Abstract]
Weighted-average term increased	4 years 2 months 12 days		1 year 8 months 12 days
Commercial Real Estate Residential [Member] \| Term Extension [Member]
Loans [Abstract]
Weighted-average term increased		1 year	1 year	1 year
Commercial Real Estate Residential [Member] \| Combination - Term Extension and Interest Rate Reduction [Member]
Loans [Abstract]
Weighted-average term increased	13 years 2 months 12 days	20 years	13 years 2 months 12 days	16 years
Weighted-average contractual interest rate, pre-modification	9.80%	9.50%	9.80%	9.20%
Weighted-average contractual interest rate, post-modification	7.80%	8.80%	7.80%	8.20%
Home Equity Lines [Member] \| Term Extension [Member]
Loans [Abstract]
Weighted-average term increased		4 years 8 months 12 days		2 years 10 months 24 days
Home Equity Lines [Member] \| Combination - Term Extension and Interest Rate Reduction [Member]
Loans [Abstract]
Weighted-average contractual interest rate		7.50%		7.50%
Weighted-average term increased	7 years 10 months 24 days	4 years 7 months 6 days	3 years 10 months 24 days	4 years 7 months 6 days
Weighted-average contractual interest rate, pre-modification	8.10%		8.00%
Weighted-average contractual interest rate, post-modification	6.80%		6.80%