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Regulatory Matters (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Tier I capital (to average assets), Amount [Abstract]    
Actual Amount $ 525,707 $ 496,432
For Capital Adequacy Purposes $ 163,136 $ 155,743
Tier I capital (to average assets), Ratio [Abstract]    
Actual Ratio 12.89% 12.75%
For Capital Adequacy Purposes 4.00% 4.00%
Common equity Tier 1 capital (to risk weighted assets), Amount [Abstract]    
Actual Amount $ 468,207 $ 436,932
For Capital Adequacy Purposes $ 137,438 $ 129,525
Common equity Tier 1 capital (to risk weighted assets), Ratio [Abstract]    
Actual Ratio 15.33% 15.18%
For Capital Adequacy Purposes 4.50% 4.50%
Tier I capital (to risk weighted assets), Amount [Abstract]    
Actual Amount $ 525,707 $ 496,432
For Capital Adequacy Purposes $ 183,173 $ 172,672
Tier I capital (to risk weighted assets), Ratio [Abstract]    
Actual Ratio 17.22% 17.25%
For Capital Adequacy Purposes 6.00% 6.00%
Total capital (to risk weighted assets), Amount [Abstract]    
Actual Amount $ 562,114 $ 532,332
For Capital Adequacy Purposes $ 244,265 $ 230,198
Total capital (to risk-weighted assets), Ratio [Abstract]    
Actual Ratio 18.41% 18.50%
For Capital Adequacy Purposes 8.00% 8.00%
Community Trust Bank, Inc [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Maximum dividend without Approval $ 56,100  
Tier I capital (to average assets), Amount [Abstract]    
Actual Amount 501,537 $ 472,615
For Capital Adequacy Purposes 162,441 155,083
To Be Well-Capitalized Under Prompt Corrective Action Provision $ 203,051 $ 193,854
Tier I capital (to average assets), Ratio [Abstract]    
Actual Ratio 12.35% 12.19%
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 $ 501,537 $ 472,615
For Capital Adequacy Purposes 137,115 129,208
To Be Well-Capitalized Under Prompt Corrective Action Provision $ 198,055 $ 186,634
Common equity Tier 1 capital (to risk weighted assets), Ratio [Abstract]    
Actual Ratio 16.46% 16.46%
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 $ 501,537 $ 472,615
For Capital Adequacy Purposes 182,820 172,278
To Be Well-Capitalized Under Prompt Corrective Action Provision $ 243,760 $ 229,704
Tier I capital (to risk weighted assets), Ratio [Abstract]    
Actual Ratio 16.46% 16.46%
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 $ 537,944 $ 508,515
For Capital Adequacy Purposes 243,827 229,708
To Be Well-Capitalized Under Prompt Corrective Action Provision $ 304,784 $ 287,134
Total capital (to risk-weighted assets), Ratio [Abstract]    
Actual Ratio 17.65% 17.71%
For Capital Adequacy Purposes 8.00% 8.00%
To Be Well-Capitalized Under Prompt Corrective Action Provision 10.00% 10.00%