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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Stock-based Compensation [Abstract]          
Stock based compensation expense       $ 423 $ 472
Restricted Stock [Member]          
Stock-based Compensation [Abstract]          
Stock based compensation expense   $ 210 $ 244 423 470
Dividend paid on stock based compensation   18 $ 21 36 $ 42
Unrecognized compensation expense related to restricted stock grants   $ 1,500   $ 1,500  
Unrecognized compensation expense, weighted average period       2 years 4 months 24 days  
Granted (in shares)   0 0 9,193 21,544
Management Retention Restricted Stock [Member]          
Stock-based Compensation [Abstract]          
Granted (in shares) 2,500        
Award vesting period       5 years  
Stock Options [Member]          
Stock-based Compensation [Abstract]          
Stock based compensation expense   $ 0 $ 0 $ 0 $ 2
Unrecognized compensation expense related to unvested stock option awards   $ 0   $ 0  
Options granted to purchase shares of CTBI common stock (in shares)       0 0
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