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Loans, Troubled Debt Restructurings Segregated by Class (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 Loan | Dec. 31, 2013 Loan
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 22 us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 64 us-gaap_FinancingReceivableModificationsNumberOfContracts2
Post-Modification Outstanding Balance | $ 7,898,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 | $ 15,087,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Commitment to extend additional credit on loans modified | 100,000 ctbi_FinancingReceivableModificationsCommitmentToExtendAdditionalCreditOnLoansModified |
Past due period for loan to be considered in default, minimum | 90 days |
Defaulted Restructured Loans, Number of Loans | 2 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 | 9 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Defaulted Restructured Loans, Recorded Balance | 669,000 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 | 1,058,000 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Term Modification [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Post-Modification Outstanding Balance | 6,982,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / ctbi_LoanRestructuringModificationAxis = ctbi_ContractualInterestRateReductionMember | 12,015,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / ctbi_LoanRestructuringModificationAxis = ctbi_ContractualInterestRateReductionMember
Rate Modification [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Post-Modification Outstanding Balance | 0 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / ctbi_LoanRestructuringModificationAxis = ctbi_ExtendedMaturityMember | 0 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / ctbi_LoanRestructuringModificationAxis = ctbi_ExtendedMaturityMember
Combination [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Post-Modification Outstanding Balance | 916,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / ctbi_LoanRestructuringModificationAxis = ctbi_ExtendedMaturityAndRateReductionMember | 3,072,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / ctbi_LoanRestructuringModificationAxis = ctbi_ExtendedMaturityAndRateReductionMember
Commercial Construction [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember | 6 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Post-Modification Outstanding Balance | 7,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember | 2,603,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Commercial Construction [Member] | Term Modification [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Post-Modification Outstanding Balance | 7,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / ctbi_LoanRestructuringModificationAxis = ctbi_ContractualInterestRateReductionMember | 2,603,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / ctbi_LoanRestructuringModificationAxis = ctbi_ContractualInterestRateReductionMember
Commercial Construction [Member] | Rate Modification [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Post-Modification Outstanding Balance | 0 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / ctbi_LoanRestructuringModificationAxis = ctbi_ExtendedMaturityMember | 0 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / ctbi_LoanRestructuringModificationAxis = ctbi_ExtendedMaturityMember
Commercial Construction [Member] | Combination [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Post-Modification Outstanding Balance | 0 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / ctbi_LoanRestructuringModificationAxis = ctbi_ExtendedMaturityAndRateReductionMember | 0 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / ctbi_LoanRestructuringModificationAxis = ctbi_ExtendedMaturityAndRateReductionMember
Commercial Secured by Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 11 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateOtherReceivableMember | 27 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateOtherReceivableMember
Post-Modification Outstanding Balance | 5,775,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateOtherReceivableMember | 5,488,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateOtherReceivableMember
Defaulted Restructured Loans, Number of Loans |  | 2 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateOtherReceivableMember
Defaulted Restructured Loans, Recorded Balance |  | 89,000 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateOtherReceivableMember
Commercial Secured by Real Estate [Member] | Term Modification [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Post-Modification Outstanding Balance | 5,707,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateOtherReceivableMember / ctbi_LoanRestructuringModificationAxis = ctbi_ContractualInterestRateReductionMember | 2,568,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateOtherReceivableMember / ctbi_LoanRestructuringModificationAxis = ctbi_ContractualInterestRateReductionMember
Commercial Secured by Real Estate [Member] | Rate Modification [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Post-Modification Outstanding Balance | 0 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateOtherReceivableMember / ctbi_LoanRestructuringModificationAxis = ctbi_ExtendedMaturityMember | 0 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateOtherReceivableMember / ctbi_LoanRestructuringModificationAxis = ctbi_ExtendedMaturityMember
Commercial Secured by Real Estate [Member] | Combination [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Post-Modification Outstanding Balance | 68,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateOtherReceivableMember / ctbi_LoanRestructuringModificationAxis = ctbi_ExtendedMaturityAndRateReductionMember | 2,920,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateOtherReceivableMember / ctbi_LoanRestructuringModificationAxis = ctbi_ExtendedMaturityAndRateReductionMember
Commercial Other [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 8 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ctbi_CommercialOtherMember | 30 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ctbi_CommercialOtherMember
Post-Modification Outstanding Balance | 1,268,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ctbi_CommercialOtherMember | 6,623,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ctbi_CommercialOtherMember
Defaulted Restructured Loans, Number of Loans | 1 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ctbi_CommercialOtherMember | 6 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ctbi_CommercialOtherMember
Defaulted Restructured Loans, Recorded Balance | 88,000 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ctbi_CommercialOtherMember | 596,000 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ctbi_CommercialOtherMember
Commercial Other [Member] | Term Modification [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Post-Modification Outstanding Balance | 1,268,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ctbi_CommercialOtherMember / ctbi_LoanRestructuringModificationAxis = ctbi_ContractualInterestRateReductionMember | 6,471,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ctbi_CommercialOtherMember / ctbi_LoanRestructuringModificationAxis = ctbi_ContractualInterestRateReductionMember
Commercial Other [Member] | Rate Modification [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Post-Modification Outstanding Balance | 0 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ctbi_CommercialOtherMember / ctbi_LoanRestructuringModificationAxis = ctbi_ExtendedMaturityMember | 0 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ctbi_CommercialOtherMember / ctbi_LoanRestructuringModificationAxis = ctbi_ExtendedMaturityMember
Commercial Other [Member] | Combination [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Post-Modification Outstanding Balance | 0 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ctbi_CommercialOtherMember / ctbi_LoanRestructuringModificationAxis = ctbi_ExtendedMaturityAndRateReductionMember | 152,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ctbi_CommercialOtherMember / ctbi_LoanRestructuringModificationAxis = ctbi_ExtendedMaturityAndRateReductionMember
Real Estate Mortgage [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 2 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_MortgageLoansOnRealEstateMember | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_MortgageLoansOnRealEstateMember
Post-Modification Outstanding Balance | 848,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_MortgageLoansOnRealEstateMember | 373,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_MortgageLoansOnRealEstateMember
Defaulted Restructured Loans, Number of Loans | 1 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_MortgageLoansOnRealEstateMember | 1 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_MortgageLoansOnRealEstateMember
Defaulted Restructured Loans, Recorded Balance | 581,000 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_MortgageLoansOnRealEstateMember | 373,000 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_MortgageLoansOnRealEstateMember
Real Estate Mortgage [Member] | Term Modification [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Post-Modification Outstanding Balance | 0 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_MortgageLoansOnRealEstateMember / ctbi_LoanRestructuringModificationAxis = ctbi_ContractualInterestRateReductionMember | 373,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_MortgageLoansOnRealEstateMember / ctbi_LoanRestructuringModificationAxis = ctbi_ContractualInterestRateReductionMember
Real Estate Mortgage [Member] | Rate Modification [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Post-Modification Outstanding Balance | 0 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_MortgageLoansOnRealEstateMember / ctbi_LoanRestructuringModificationAxis = ctbi_ExtendedMaturityMember | 0 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_MortgageLoansOnRealEstateMember / ctbi_LoanRestructuringModificationAxis = ctbi_ExtendedMaturityMember
Real Estate Mortgage [Member] | Combination [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Post-Modification Outstanding Balance | $ 848,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_MortgageLoansOnRealEstateMember / ctbi_LoanRestructuringModificationAxis = ctbi_ExtendedMaturityAndRateReductionMember | $ 0 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_MortgageLoansOnRealEstateMember / ctbi_LoanRestructuringModificationAxis = ctbi_ExtendedMaturityAndRateReductionMember

X
- Definition Refers to the commitments to extend additional credit on loans that are considered troubled debt restructurings. + References No definition available. + Details
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- Definition Refers to the minimum past due period for a loan to be considered in default. + References No definition available. + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524 + Details
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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524 + Details
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