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Commitments and Contingencies (Details) | 3 Months Ended
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Mar. 31, 2018 Product
Commitments and Contingencies [Abstract] |
Number of deposit add-on products for which certain customer reimbursements are to be made | 2

X
- Definition Refers to the number of deposit add-on products for which certain customer reimbursements are to be made. + References No definition available. + Details
Name: | ctbi_NumberOfDepositAddOnProductsForWhichCertainCustomerReimbursementsAreToBeMade
Namespace Prefix: | ctbi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration