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Fair Value of Financial Assets and Liabilities, Fair Value Measurements of Assets Measured on Nonrecurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Dec. 31, 2023
Assets measured-nonrecurring basis [Abstract]
Collateral dependent loans	$ 8,319		$ 8,319	$ 8,397
Impaired loan (collateral dependent) [Abstract]
Fair value adjustments on collateral dependent loans		$ 0		300
Other real estate owned [Abstract]
Other real estate owned, fair value adjustment				100
Minimum [Member]
Other real estate owned [Abstract]
Typical frequency of periodic reviews			12 months
Maximum [Member]
Other real estate owned [Abstract]
Typical frequency of periodic reviews			18 months
Frequency of periodic reviews in general			24 months
Nonrecurring [Member]
Assets measured-nonrecurring basis [Abstract]
Collateral dependent loans adjustment	0			100
Nonrecurring [Member] | Fair Value [Member]
Assets measured-nonrecurring basis [Abstract]
Collateral dependent loans	8,319		$ 8,319	8,397
Other real estate owned	471		471	205
Other real estate owned fair value disclosure adjustment	6		6
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Nonrecurring [Member] | Fair Value [Member]
Assets measured-nonrecurring basis [Abstract]
Collateral dependent loans	0		0	0
Other real estate owned	0		0	0
Significant Other Observable Inputs (Level 2) [Member] | Nonrecurring [Member] | Fair Value [Member]
Assets measured-nonrecurring basis [Abstract]
Collateral dependent loans	0		0	0
Other real estate owned	0		0	0
Significant Unobservable Inputs (Level 3) [Member] | Nonrecurring [Member] | Fair Value [Member]
Assets measured-nonrecurring basis [Abstract]
Collateral dependent loans	8,319		8,319	8,397
Other real estate owned	$ 471		$ 471	$ 205

X

- Definition

This element represents the fair value disclosure of collateral dependent loan receivable as presented on the statement of financial position during the period.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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- Definition

This element represents the fair value disclosure of collateral dependent loan receivable as presented on the statement of financial position.

+ References

No definition available.

+ Details

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

X

- Definition

The amount at which an asset could be bought or sold in a current transaction between willing parties, that is, other than in a forced or liquidation sale.

+ References

No definition available.

+ Details

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

X

- Definition

The amount at which an asset could be bought or sold in a current transaction between willing parties, that is, other than in a forced or liquidation sale.

+ References

No definition available.

+ Details

Name:	ctbi_FairValueAdjustmentOnOtherRealEstateOwned
Namespace Prefix:	ctbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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Namespace Prefix:	ctbi_
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X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents other real estate owned at fair value.

+ References

No definition available.

+ Details

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Namespace Prefix:	ctbi_
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Balance Type:	debit
Period Type:	instant

X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents other real estate owned at fair value during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	ctbi_
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X

- Definition

The frequency of periodic reviews for appraisals on foreclosed properties and other real estate owned generally, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

The typical frequency of periodic reviews for appraisals on foreclosed properties and other real estate owned, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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