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Fair Market Value of Financial Assets and Liabilities, Quantitative Information about Level 3 Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Mortgage Servicing Rights [Member] | Discount Cash Flows, Computer Pricing Model [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 2,968 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_ValuationTechniqueAxis = ctbi_DiscountCashFlowsComputerPricingModelMember | 3,424 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_ValuationTechniqueAxis = ctbi_DiscountCashFlowsComputerPricingModelMember
Mortgage Servicing Rights [Member] | Discount Cash Flows, Computer Pricing Model [Member] | Minimum [Member] |  |
Unobservable inputs [Abstract] |  |
Constant prepayment rate (in hundredths) | 4.60%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = ctbi_DiscountCashFlowsComputerPricingModelMember | 4.30%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = ctbi_DiscountCashFlowsComputerPricingModelMember
Probability of default (in hundredths) | 0.00%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = ctbi_DiscountCashFlowsComputerPricingModelMember | 0.00%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = ctbi_DiscountCashFlowsComputerPricingModelMember
Discount rate (in hundredths) | 10.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = ctbi_DiscountCashFlowsComputerPricingModelMember |
Mortgage Servicing Rights [Member] | Discount Cash Flows, Computer Pricing Model [Member] | Maximum [Member] |  |
Unobservable inputs [Abstract] |  |
Constant prepayment rate (in hundredths) | 25.10%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = ctbi_DiscountCashFlowsComputerPricingModelMember | 23.60%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = ctbi_DiscountCashFlowsComputerPricingModelMember
Probability of default (in hundredths) | 100.00%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = ctbi_DiscountCashFlowsComputerPricingModelMember | 33.33%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = ctbi_DiscountCashFlowsComputerPricingModelMember
Discount rate (in hundredths) | 11.50%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = ctbi_DiscountCashFlowsComputerPricingModelMember |
Mortgage Servicing Rights [Member] | Discount Cash Flows, Computer Pricing Model [Member] | Weighted Average [Member] |  |
Unobservable inputs [Abstract] |  |
Constant prepayment rate (in hundredths) | 11.30%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = ctbi_DiscountCashFlowsComputerPricingModelMember | 9.70%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = ctbi_DiscountCashFlowsComputerPricingModelMember
Probability of default (in hundredths) | 3.61%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = ctbi_DiscountCashFlowsComputerPricingModelMember | 3.36%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = ctbi_DiscountCashFlowsComputerPricingModelMember
Discount rate (in hundredths) | 10.13%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = ctbi_DiscountCashFlowsComputerPricingModelMember | 10.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = ctbi_MortgageServicingRightsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = ctbi_DiscountCashFlowsComputerPricingModelMember
Impaired Loans (Collateral Dependent) [Member] | Market Comparable Properties [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 4,665 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ctbi_ImpairedLoansCollateralDependentMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | 6,830 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ctbi_ImpairedLoansCollateralDependentMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember
Impaired Loans (Collateral Dependent) [Member] | Market Comparable Properties [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 / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | 5.00%us-gaap_FairValueInputsDiscountForLackOfMarketability / us-gaap_FairValueByAssetClassAxis = ctbi_ImpairedLoansCollateralDependentMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember
Impaired Loans (Collateral Dependent) [Member] | Market Comparable Properties [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 / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | 10.00%us-gaap_FairValueInputsDiscountForLackOfMarketability / us-gaap_FairValueByAssetClassAxis = ctbi_ImpairedLoansCollateralDependentMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember
Impaired Loans (Collateral Dependent) [Member] | Market Comparable Properties [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 / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | 7.00%us-gaap_FairValueInputsDiscountForLackOfMarketability / us-gaap_FairValueByAssetClassAxis = ctbi_ImpairedLoansCollateralDependentMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember
Other Real Estate/Asset Owned [Member] | Market Comparable Properties [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 6,472 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ctbi_OtherRealEstateAssetOwnedMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | 11,111 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ctbi_OtherRealEstateAssetOwnedMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember
Other Real Estate/Asset Owned [Member] | Market Comparable Properties [Member] | Minimum [Member] |  |
Unobservable inputs [Abstract] |  |
Comparability adjustments (in hundredths) | 3.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = ctbi_OtherRealEstateAssetOwnedMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | 5.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = ctbi_OtherRealEstateAssetOwnedMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember
Other Real Estate/Asset Owned [Member] | Market Comparable Properties [Member] | Maximum [Member] |  |
Unobservable inputs [Abstract] |  |
Comparability adjustments (in hundredths) | 67.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = ctbi_OtherRealEstateAssetOwnedMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | 38.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = ctbi_OtherRealEstateAssetOwnedMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember
Other Real Estate/Asset Owned [Member] | Market Comparable Properties [Member] | Weighted Average [Member] |  |
Unobservable inputs [Abstract] |  |
Comparability adjustments (in hundredths) | 18.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = ctbi_OtherRealEstateAssetOwnedMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | 9.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = ctbi_OtherRealEstateAssetOwnedMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / 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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