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Commitments and Contingencies (Details) | 12 Months Ended
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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

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- 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: |