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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation expense     $ 387 $ 344
Black-Scholes option pricing model, weighted average assumptions [Abstract]        
Expected dividend yield (in hundredths)     3.72%  
Risk-free interest rate (in hundredths)     1.54%  
Expected volatility (in hundredths)     30.77%  
Expected term     7 years  
Weighted average fair value of options (in dollars per share)     $ 6.60  
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation expense $ 10 $ 2 $ 18 $ 6
Unrecognized compensation expense related to unvested stock option awards $ 200   $ 200  
Unrecognized compensation expense, weighted average period     4 years 3 months 18 days  
Options granted to purchase shares of CTBI common stock (in shares) 0 0 20,000 0
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation expense $ 180 $ 151 $ 369 $ 338
Dividend paid on stock based compensation 20 $ 30 $ 39 $ 60
Unrecognized compensation expense, weighted average period     2 years  
Unrecognized compensation expense related to restricted stock grants $ 800   $ 800  
Granted (in shares) 0 0 10,582 4,561
Period of restrictions on stock     4 years 4 years