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Summary of Significant Accounting Policies (Details)
 3 Months Ended
Mar. 31, 2015
Payment
Quarter
Jun. 02, 2014
Summary of Significant Accounting Policies [Abstract]    
Stock dividend issued (in hundredths)   10.00%ctbi_CommonStockDividendsIssued
Past due period after which loans must be well secured and in the process of collection to continue accruing interest 90 days  
Minimum threshold period for not reclassifying loans as accruing loans 6 months  
Financing Receivable, Allowance for Credit Losses [Line Items]    
Number of monthly payments before loan charge off 5ctbi_NumberOfMonthlyPaymentsBeforeLoanChargeOff  
Current value assessment period for past due loans secured against real estate 90 days  
Foreclosure proceedings initiated 120 days  
Historical loan loss review period 12ctbi_HistoricalLoanLossReviewPeriod  
Other real estate owned [Abstract]    
Other real estate owned frequency of period reviews minimum 12 months  
Other real estate owned typical frequency of period reviews maximum 18 months  
Maximum frequency of periodic reviews of real estate owned in general 24 months  
Unsecured Commercial Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Charge off threshold for loans considered uncollectible 90 days  
Closed-End Consumer Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Charge off threshold for loans considered uncollectible 120 days