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Mortgage Banking and Servicing Rights (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Mortgage Banking and Servicing Rights [Abstract] |  |  |  |  |  |
Net gain on sale of loans held for sale | $ 1,468 us-gaap_GainLossOnSaleOfMortgageLoans |  | $ 3,098 us-gaap_GainLossOnSaleOfMortgageLoans |  | $ 2,562 us-gaap_GainLossOnSaleOfMortgageLoans |
Net loan servicing income (expense) |  |  |  |  |  |
Servicing fees | 1,129 us-gaap_ContractuallySpecifiedServicingFeesAmount |  | 1,121 us-gaap_ContractuallySpecifiedServicingFeesAmount |  | 1,083 us-gaap_ContractuallySpecifiedServicingFeesAmount |
Late fees | 112 us-gaap_LateFeeIncomeGeneratedByServicingFinancialAssetsAmount |  | 98 us-gaap_LateFeeIncomeGeneratedByServicingFinancialAssetsAmount |  | 83 us-gaap_LateFeeIncomeGeneratedByServicingFinancialAssetsAmount |
Ancillary fees | 149 us-gaap_AncillaryFeeIncomeGeneratedByServicingFinancialAssetsAmount |  | 368 us-gaap_AncillaryFeeIncomeGeneratedByServicingFinancialAssetsAmount |  | 382 us-gaap_AncillaryFeeIncomeGeneratedByServicingFinancialAssetsAmount |
Fair value adjustments | (830)us-gaap_MortgageServicingRightsMSRImpairmentRecovery |  | 206 us-gaap_MortgageServicingRightsMSRImpairmentRecovery |  | (559)us-gaap_MortgageServicingRightsMSRImpairmentRecovery |
Net loan servicing income | 560 ctbi_NetLoanServicingIncomeLoss |  | 1,793 ctbi_NetLoanServicingIncomeLoss |  | 989 ctbi_NetLoanServicingIncomeLoss |
Mortgage banking income | 2,028 us-gaap_FeesAndCommissionsMortgageBanking |  | 4,891 us-gaap_FeesAndCommissionsMortgageBanking |  | 3,551 us-gaap_FeesAndCommissionsMortgageBanking |
Loan service for benefit of others | 441 ctbi_LoanServiceForBenefitOfOthers |  | 456 ctbi_LoanServiceForBenefitOfOthers |  | 419 ctbi_LoanServiceForBenefitOfOthers |
Custodial escrow balance | 888 ctbi_CustodianEscrowBalance |  | 855 ctbi_CustodianEscrowBalance |  | 673 ctbi_CustodianEscrowBalance |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |  |  |
Fair value of MSRs, beginning of period | 3,424 us-gaap_ServicingAssetAtFairValueAmount |  | 2,364 us-gaap_ServicingAssetAtFairValueAmount |  | 2,282 us-gaap_ServicingAssetAtFairValueAmount |
New servicing assets created | 374 us-gaap_ServicingAssetAtFairValueAdditions |  | 854 us-gaap_ServicingAssetAtFairValueAdditions |  | 641 us-gaap_ServicingAssetAtFairValueAdditions |
Change in fair value during the period due to [Abstract] |  |  |  |  |  |
Time decay | (162)us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue | [1] | (159)us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue | [1] | (116)us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue | [1]
Payoffs | (202)us-gaap_ServicingAssetAtFairValueOtherChangesThatAffectBalance | [2] | (423)us-gaap_ServicingAssetAtFairValueOtherChangesThatAffectBalance | [2] | (478)us-gaap_ServicingAssetAtFairValueOtherChangesThatAffectBalance | [2]
Changes in valuation inputs or assumptions | (466)us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions | [3] | 788 us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions | [3] | 35 us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions | [3]
Fair value of MSRs, end of period | $ 2,968 us-gaap_ServicingAssetAtFairValueAmount |  | $ 3,424 us-gaap_ServicingAssetAtFairValueAmount |  | $ 2,364 us-gaap_ServicingAssetAtFairValueAmount |
Discount rate of servicing assets and servicing liabilities (in hundredths) | 10.10%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate |  | 10.00%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate |  | 10.50%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate |
Weighted average default rates (in hundredths) | 3.61%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueExpectedCreditLosses |  | 3.36%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueExpectedCreditLosses |  | 2.65%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueExpectedCreditLosses |
Prepayment using andrew davidson model (in hundredths) | 11.30%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed |  | 9.70%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed |  | 16.30%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed |
[1] | Represents decrease in value due to regularly scheduled loan principal payments and partial loan paydowns.
[2] | Represents decrease in value due to loans that paid off during the period.
[3] | Represents change in value resulting from market-driven changes in interest rates.

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- Definition Amount maintained in connection with a loan servicing to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. + References No definition available. + Details
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- Definition Outstanding balance of underlying mortgage loans serviced for others + References No definition available. + Details
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- Definition The net income (loss) from loan servicing activities that is included in earnings for the reporting period. + References No definition available. + Details
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- Definition All amounts that are due to the servicer of a financial asset, excluding contractually specified servicing fees and late fees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122596-111746 + Details
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- Definition All amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer. Depending on the servicing contract, those fees may include some or all of the difference between the interest rate collected on the asset being serviced and the rate to be paid to the beneficial owners of the asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122596-111746 + Details
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- Definition The noninterest income derived from mortgage banking activities (fees and commissions), excluding fees earned from servicing third-party assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13 (d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition All amounts that are due to the servicer of a financial asset as a result of the debt holder not meeting the monthly payment terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122596-111746 + Details
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- Definition The adjustment to the carrying value of the rights retained or purchased to service mortgages. These adjustments are made when the estimate of the fair value is changed. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(6),(7) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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- Definition The net Increase or Decrease in fair value as a result of changes in the inputs, assumptions, or model used to calculate the fair value of servicing assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(4)(i) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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- Definition The net Increase or Decrease in fair value as a result of other changes that are not additions, disposals, or a result of change in the inputs, assumptions, or model used to calculate the fair value of servicing assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(4)(ii) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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- Definition Other net Increase or Decrease in the balance in servicing assets subsequently measured at fair value. This element is for changes other than additions, disposals, changes in fair value resulting from changes in valuation inputs or changes in assumptions, or other changes in fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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- Definition Discount rate used to estimate the fair value of servicing assets and servicing liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122596-111746 + Details
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- Definition Percentage of contractually collectible principal associated with a financial asset expected not to be collected due to default by the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122596-111746 + Details
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- Definition Estimated rate of prepayments of principal on servicing assets and servicing liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122596-111746 + Details
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