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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Stock-based Compensation [Abstract]      
Stock based compensation expense   $ 213 $ 228
Stock Options [Member]      
Stock-based Compensation [Abstract]      
Stock based compensation expense   0 $ 2
Unrecognized compensation expense related to unvested stock option awards   $ 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   $ 213 $ 226
Dividend paid on stock based compensation   18 $ 21
Unrecognized compensation expense related to restricted stock grants   $ 1,700  
Unrecognized compensation expense, weighted average period   2 years 7 months 6 days  
Granted (in shares)   9,193 21,544
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