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Stock-Based Compensation (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation expense     $ 344,000 $ 335,000
Dividend paid on stock based compensation 30,000 31,000 60,000 62,000
Options granted to purchase shares of CTBI common stock (in shares) 0 0 0 1,650
Black-Scholes option pricing model, weighted average assumptions [Abstract]        
Expected dividend yield (in hundredths)   3.74%    
Risk-free interest rate (in hundredths)   1.33%    
Expected volatility (in hundredths)   39.11%    
Expected term (in years)   7 years 6 months    
Weighted average fair value of options granted (in dollars per share)   $ 8.23    
Stock options [Member]
        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation expense 2,000 2,000 6,000 5,000
Unrecognized compensation expense related to unvested stock option awards 10,000   10,000  
Unrecognized compensation expense, weighted average period     2 years 3 months 18 days  
Restricted stock [Member]
        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation expense 151,000 169,000 338,000 330,000
Unrecognized compensation expense, weighted average period     1 year 9 months 18 days  
Unrecognized compensation expense related to restricted stock grants $ 1,200,000   $ 1,200,000  
Granted (in shares) 0 0 4,347 11,904
Period of restrictions on stock     4 years 4 years