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Commitments and Contingencies (Details)	12 Months Ended
	Dec. 31, 2017 Review
Unfavorable Regulatory Action [Member]
Loss Contingencies [Line Items]
Number of CTB deposit add-on products under review	2

X

- Definition

Refers to the number of deposit add-on products of the bank which are currently under review by a regulatory agency.

+ References

No definition available.

+ Details

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

X

- 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

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_UnfavorableRegulatoryActionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: