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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Stock-based Compensation [Abstract]        
Stock based compensation expense     $ 645 $ 553
Stock Options [Member]        
Stock-based Compensation [Abstract]        
Stock based compensation expense $ 8 $ 11 29 $ 74
Unrecognized compensation expense related to unvested stock option awards 9   $ 9  
Unrecognized compensation expense, weighted average period     3 months 18 days  
Options granted to purchase shares of CTBI common stock (in shares)     0 0
Restricted Stock [Member]        
Stock-based Compensation [Abstract]        
Stock based compensation expense 205 143 $ 616 $ 479
Dividend paid on stock based compensation 19 $ 13 $ 56 $ 38
Unrecognized compensation expense, weighted average period     2 years 8 months 12 days  
Unrecognized compensation expense related to restricted stock grants $ 1,600   $ 1,600  
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