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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Stock-based Compensation [Abstract]        
Stock based compensation expense     $ 432 $ 400
Stock Options [Member]        
Stock-based Compensation [Abstract]        
Stock based compensation expense $ 10 $ 10 21 $ 63
Unrecognized compensation expense related to unvested stock option awards 16   $ 16  
Unrecognized compensation expense, weighted average period     6 months  
Options granted to purchase shares of CTBI common stock (in shares)     0 0
Restricted Stock [Member]        
Stock-based Compensation [Abstract]        
Stock based compensation expense 222 154 $ 411 $ 337
Dividend paid on stock based compensation 18 $ 13 $ 37 $ 25
Unrecognized compensation expense, weighted average period     2 years 10 months 24 days  
Unrecognized compensation expense related to restricted stock grants $ 1,800   $ 1,800  
Granted (in shares)     27,921 11,320
2015 Plan [Member] | Restricted Stock [Member]        
Stock-based Compensation [Abstract]        
Award vesting period     4 years  
2015 Plan [Member] | Restricted Stock [Member] | Maximum [Member]        
Stock-based Compensation [Abstract]        
Period of certain participant employee termination events following change in control for restriction on restricted stock granted to lapse     24 months