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Related Party Transactions (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Loans and Leases Receivable, Related Parties [Roll Forward]      
Related party extensions of credit, beginning of period $ 33,103,000us-gaap_LoansAndLeasesReceivableRelatedParties $ 33,038,000us-gaap_LoansAndLeasesReceivableRelatedParties  
New loans and advances on lines of credit 5,500,000us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions 8,305,000us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions  
Repayments (1,281,000)us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections (8,237,000)us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections  
Increase/(decrease) due to changes in related parties 151,000ctbi_LoansAndLeasesReceivableRelatedPartiesOtherChanges (3,000)ctbi_LoansAndLeasesReceivableRelatedPartiesOtherChanges  
Related party extensions of credit, end of period 37,473,000us-gaap_LoansAndLeasesReceivableRelatedParties 33,103,000us-gaap_LoansAndLeasesReceivableRelatedParties 33,038,000us-gaap_LoansAndLeasesReceivableRelatedParties
Related Party Transaction [Line Items]      
Related party deposit 12,400,000us-gaap_RelatedPartyDepositLiabilities 13,300,000us-gaap_RelatedPartyDepositLiabilities  
Legal fees 2,444,000us-gaap_LegalFees 2,392,000us-gaap_LegalFees 2,154,000us-gaap_LegalFees
Director [Member]      
Related Party Transaction [Line Items]      
Legal fees 1,000,000us-gaap_LegalFees
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember
1,100,000us-gaap_LegalFees
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember
1,300,000us-gaap_LegalFees
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember
Expenses paid to law firm 100,000us-gaap_OtherExpenses
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember
200,000us-gaap_OtherExpenses
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember
200,000us-gaap_OtherExpenses
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember
Payment for legal services $ 1,100,000us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember
$ 1,300,000us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember
$ 1,500,000us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember