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Fair Value of Financial Assets and Liabilities, Quantitative Information about Level 3 Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 | Dec. 31, 2014
Mortgage Servicing Rights [Member] | Minimum [Member] |  |
Unobservable inputs [Abstract] |  |
Constant prepayment rate (in hundredths) | 4.70%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 4.60%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Probability of default (in hundredths) | 0.00%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 0.00%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Discount rate (in hundredths) |  | 10.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Mortgage Servicing Rights [Member] | Maximum [Member] |  |
Unobservable inputs [Abstract] |  |
Constant prepayment rate (in hundredths) | 25.40%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 25.10%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Probability of default (in hundredths) | 100.00%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 100.00%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Discount rate (in hundredths) |  | 11.50%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Mortgage Servicing Rights [Member] | Weighted Average [Member] |  |
Unobservable inputs [Abstract] |  |
Constant prepayment rate (in hundredths) | 12.10%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember | 11.30%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember
Probability of default (in hundredths) | 3.50%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember | 3.61%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember
Discount rate (in hundredths) | 10.13%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember | 10.10%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember
Mortgage Servicing Rights [Member] | Income Approach Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 2,797 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember | 2,968 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember
Impaired Loans (Collateral Dependent) [Member] | Minimum [Member] |  |
Unobservable inputs [Abstract] |  |
Marketability discount (in hundredths) | 5.00%us-gaap_FairValueInputsDiscountForLackOfMarketability / us-gaap_FairValueByAssetClassAxis = ctbi_ImpairedLoansCollateralDependentMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 5.00%us-gaap_FairValueInputsDiscountForLackOfMarketability / us-gaap_FairValueByAssetClassAxis = ctbi_ImpairedLoansCollateralDependentMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Impaired Loans (Collateral Dependent) [Member] | Maximum [Member] |  |
Unobservable inputs [Abstract] |  |
Marketability discount (in hundredths) | 10.00%us-gaap_FairValueInputsDiscountForLackOfMarketability / us-gaap_FairValueByAssetClassAxis = ctbi_ImpairedLoansCollateralDependentMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 10.00%us-gaap_FairValueInputsDiscountForLackOfMarketability / us-gaap_FairValueByAssetClassAxis = ctbi_ImpairedLoansCollateralDependentMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Impaired Loans (Collateral Dependent) [Member] | Weighted Average [Member] |  |
Unobservable inputs [Abstract] |  |
Marketability discount (in hundredths) | 7.00%us-gaap_FairValueInputsDiscountForLackOfMarketability / us-gaap_FairValueByAssetClassAxis = ctbi_ImpairedLoansCollateralDependentMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember | 7.00%us-gaap_FairValueInputsDiscountForLackOfMarketability / us-gaap_FairValueByAssetClassAxis = ctbi_ImpairedLoansCollateralDependentMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember
Impaired Loans (Collateral Dependent) [Member] | Market Approach Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 2,760 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ctbi_ImpairedLoansCollateralDependentMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | 4,665 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ctbi_ImpairedLoansCollateralDependentMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember
Other Real Estate/Asset Owned [Member] | Minimum [Member] |  |
Unobservable inputs [Abstract] |  |
Comparability adjustments (in hundredths) | 5.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = ctbi_OtherRealEstateAssetOwnedMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 3.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = ctbi_OtherRealEstateAssetOwnedMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Other Real Estate/Asset Owned [Member] | Maximum [Member] |  |
Unobservable inputs [Abstract] |  |
Comparability adjustments (in hundredths) | 93.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = ctbi_OtherRealEstateAssetOwnedMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 67.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = ctbi_OtherRealEstateAssetOwnedMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Other Real Estate/Asset Owned [Member] | Weighted Average [Member] |  |
Unobservable inputs [Abstract] |  |
Comparability adjustments (in hundredths) | 29.57%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = ctbi_OtherRealEstateAssetOwnedMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember | 18.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = ctbi_OtherRealEstateAssetOwnedMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember
Other Real Estate/Asset Owned [Member] | Market Approach Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 265 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ctbi_OtherRealEstateAssetOwnedMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | 6,472 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ctbi_OtherRealEstateAssetOwnedMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Percentage of adjustment to the observed price for a similar asset or liability when an identical transaction does not exist, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Adjustment to the discount rate used to measure fair value for lack of ability to convert business interests into cash quickly. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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