Regulatory Matters (Details) $ in Thousands	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
CBLR, Amount [Abstract]
Actual Amount	$ 636,672
For Capital Adequacy Purposes	$ 401,158
CBLR, Ratio [Abstract]
Actual Ratio	0.1270
For Capital Adequacy Purposes	0.0800
Tier I capital (to average assets), Amount [Abstract]
Actual Amount		$ 601,142
For Capital Adequacy Purposes		$ 171,632
Tier I capital (to average assets), Ratio [Abstract]
Actual Ratio		0.1401
For Capital Adequacy Purposes		0.0400
Common equity Tier 1 capital (to risk weighted assets), Amount [Abstract]
Actual Amount		$ 545,142
For Capital Adequacy Purposes		$ 142,790
Common equity Tier 1 capital (to risk weighted assets), Ratio [Abstract]
Actual Ratio		0.1718
For Capital Adequacy Purposes		4.50%
Tier I capital (to risk weighted assets), Amount [Abstract]
Actual Amount		$ 601,142
For Capital Adequacy Purposes		$ 190,436
Tier I capital (to risk weighted assets), Ratio [Abstract]
Actual Ratio		0.1894
For Capital Adequacy Purposes		0.0600
Total capital (to risk weighted assets), Amount [Abstract]
Actual Amount		$ 636,512
For Capital Adequacy Purposes		$ 253,970
Total capital (to risk-weighted assets), Ratio [Abstract]
Actual Ratio		0.2005
For Capital Adequacy Purposes		0.0800
Community Trust Bank, Inc [Member]
Regulatory Matter [Abstract]
Maximum dividend without Approval	$ 66,600
CBLR, Amount [Abstract]
Actual Amount	605,606
For Capital Adequacy Purposes	$ 399,303
CBLR, Ratio [Abstract]
Actual Ratio	0.1213
For Capital Adequacy Purposes	0.0800
Tier I capital (to average assets), Amount [Abstract]
Actual Amount		$ 570,256
For Capital Adequacy Purposes		170,991
To Be Well-Capitalized Under Prompt Corrective Action Provision		$ 213,739
Tier I capital (to average assets), Ratio [Abstract]
Actual Ratio		0.1334
For Capital Adequacy Purposes		0.0400
To Be Well-Capitalized Under Prompt Corrective Action Provision		0.0500
Common equity Tier 1 capital (to risk weighted assets), Amount [Abstract]
Actual Amount		$ 570,256
For Capital Adequacy Purposes		142,485
To Be Well-Capitalized Under Prompt Corrective Action Provision		$ 205,811
Common equity Tier 1 capital (to risk weighted assets), Ratio [Abstract]
Actual Ratio		0.1801
For Capital Adequacy Purposes		4.50%
To Be Well-Capitalized Under Prompt Corrective Action Provision		6.50%
Tier I capital (to risk weighted assets), Amount [Abstract]
Actual Amount		$ 570,256
For Capital Adequacy Purposes		189,980
To Be Well-Capitalized Under Prompt Corrective Action Provision		$ 253,306
Tier I capital (to risk weighted assets), Ratio [Abstract]
Actual Ratio		0.1801
For Capital Adequacy Purposes		0.0600
To Be Well-Capitalized Under Prompt Corrective Action Provision		0.0800
Total capital (to risk weighted assets), Amount [Abstract]
Actual Amount		$ 605,625
For Capital Adequacy Purposes		253,400
To Be Well-Capitalized Under Prompt Corrective Action Provision		$ 316,749
Total capital (to risk-weighted assets), Ratio [Abstract]
Actual Ratio		0.1912
For Capital Adequacy Purposes		0.0800
To Be Well-Capitalized Under Prompt Corrective Action Provision		0.1000