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Regulatory Matters (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Tier I capital (to average assets), Amount [Abstract]    
Actual Amount $ 601,142 $ 562,771
For Capital Adequacy Purposes $ 171,632 $ 166,623
Tier I capital (to average assets), Ratio [Abstract]    
Actual Ratio 14.01% 13.51%
For Capital Adequacy Purposes 4.00% 4.00%
Common equity Tier 1 capital (to risk weighted assets), Amount [Abstract]    
Actual Amount $ 545,142 $ 505,271
For Capital Adequacy Purposes $ 142,790 $ 139,749
Common equity Tier 1 capital (to risk weighted assets), Ratio [Abstract]    
Actual Ratio 17.18% 16.27%
For Capital Adequacy Purposes 4.50% 4.50%
Tier I capital (to risk weighted assets), Amount [Abstract]    
Actual Amount $ 601,142 $ 562,771
For Capital Adequacy Purposes $ 190,436 $ 186,348
Tier I capital (to risk weighted assets), Ratio [Abstract]    
Actual Ratio 18.94% 18.12%
For Capital Adequacy Purposes 6.00% 6.00%
Total capital (to risk weighted assets), Amount [Abstract]    
Actual Amount $ 636,512 $ 598,934
For Capital Adequacy Purposes $ 253,970 $ 248,391
Total capital (to risk-weighted assets), Ratio [Abstract]    
Actual Ratio 20.05% 19.29%
For Capital Adequacy Purposes 8.00% 8.00%
Community Trust Bank, Inc [Member]    
Regulatory Matter [Abstract]    
Maximum dividend without Approval $ 68,800  
Tier I capital (to average assets), Amount [Abstract]    
Actual Amount 570,256 $ 536,992
For Capital Adequacy Purposes 170,991 165,994
To Be Well-Capitalized Under Prompt Corrective Action Provision $ 213,739 $ 207,493
Tier I capital (to average assets), Ratio [Abstract]    
Actual Ratio 13.34% 12.94%
For Capital Adequacy Purposes 4.00% 4.00%
To Be Well-Capitalized Under Prompt Corrective Action Provision 5.00% 5.00%
Common equity Tier 1 capital (to risk weighted assets), Amount [Abstract]    
Actual Amount $ 570,256 $ 536,992
For Capital Adequacy Purposes 142,485 139,438
To Be Well-Capitalized Under Prompt Corrective Action Provision $ 205,811 $ 201,411
Common equity Tier 1 capital (to risk weighted assets), Ratio [Abstract]    
Actual Ratio 18.01% 17.33%
For Capital Adequacy Purposes 4.50% 4.50%
To Be Well-Capitalized Under Prompt Corrective Action Provision 6.50% 6.50%
Tier I capital (to risk weighted assets), Amount [Abstract]    
Actual Amount $ 570,256 $ 536,992
For Capital Adequacy Purposes 189,980 185,918
To Be Well-Capitalized Under Prompt Corrective Action Provision $ 253,306 $ 247,890
Tier I capital (to risk weighted assets), Ratio [Abstract]    
Actual Ratio 18.01% 17.33%
For Capital Adequacy Purposes 6.00% 6.00%
To Be Well-Capitalized Under Prompt Corrective Action Provision 8.00% 8.00%
Total capital (to risk weighted assets), Amount [Abstract]    
Actual Amount $ 605,625 $ 573,155
For Capital Adequacy Purposes 253,400 247,851
To Be Well-Capitalized Under Prompt Corrective Action Provision $ 316,749 $ 309,814
Total capital (to risk-weighted assets), Ratio [Abstract]    
Actual Ratio 19.12% 18.50%
For Capital Adequacy Purposes 8.00% 8.00%
To Be Well-Capitalized Under Prompt Corrective Action Provision 10.00% 10.00%