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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Stock-based Compensation [Abstract]          
Stock based compensation expense       $ 708 $ 645
Stock Options [Member]          
Stock-based Compensation [Abstract]          
Stock based compensation expense   $ 0 $ 8 2 $ 29
Unrecognized compensation expense related to unvested stock option awards   0   $ 0  
Options granted to purchase shares of CTBI common stock (in shares)       0 0
Restricted Stock [Member]          
Stock-based Compensation [Abstract]          
Stock based compensation expense   236 205 $ 706 $ 616
Dividend paid on stock based compensation   21 $ 19 63 $ 56
Unrecognized compensation expense related to restricted stock grants   $ 1,700   $ 1,700  
Unrecognized compensation expense, weighted average period       2 years 8 months 12 days  
Granted (in shares)   0 0 21,544 27,921
Management Retention Restricted Stock [Member]          
Stock-based Compensation [Abstract]          
Granted (in shares) 2,500        
Award vesting period       5 years  
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