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Regulatory Matters (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Tier I capital (to average assets), Amount [Abstract] |  |
Actual Amount | $ 562,771 | $ 525,707
For Capital Adequacy Purposes | $ 166,623 | $ 163,136
Tier I capital (to average assets), Ratio [Abstract] |  |
Actual Ratio | 13.51% | 12.89%
For Capital Adequacy Purposes | 4.00% | 4.00%
Common equity Tier 1 capital (to risk weighted assets), Amount [Abstract] |  |
Actual Amount | $ 505,271 | $ 468,207
For Capital Adequacy Purposes | $ 139,749 | $ 137,438
Common equity Tier 1 capital (to risk weighted assets), Ratio [Abstract] |  |
Actual Ratio | 16.27% | 15.33%
For Capital Adequacy Purposes | 4.50% | 4.50%
Tier I capital (to risk weighted assets), Amount [Abstract] |  |
Actual Amount | $ 562,771 | $ 525,707
For Capital Adequacy Purposes | $ 186,348 | $ 183,173
Tier I capital (to risk weighted assets), Ratio [Abstract] |  |
Actual Ratio | 18.12% | 17.22%
For Capital Adequacy Purposes | 6.00% | 6.00%
Total capital (to risk weighted assets), Amount [Abstract] |  |
Actual Amount | $ 598,934 | $ 562,114
For Capital Adequacy Purposes | $ 248,391 | $ 244,265
Total capital (to risk-weighted assets), Ratio [Abstract] |  |
Actual Ratio | 19.29% | 18.41%
For Capital Adequacy Purposes | 8.00% | 8.00%
Community Trust Bank, Inc [Member] |  |
Regulatory Matter [Abstract] |  |
Maximum dividend without Approval | $ 63,400 |
Tier I capital (to average assets), Amount [Abstract] |  |
Actual Amount | 536,992 | $ 501,537
For Capital Adequacy Purposes | 165,994 | 162,441
To Be Well-Capitalized Under Prompt Corrective Action Provision | $ 207,493 | $ 203,051
Tier I capital (to average assets), Ratio [Abstract] |  |
Actual Ratio | 12.94% | 12.35%
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 | $ 536,992 | $ 501,537
For Capital Adequacy Purposes | 139,438 | 137,115
To Be Well-Capitalized Under Prompt Corrective Action Provision | $ 201,411 | $ 198,055
Common equity Tier 1 capital (to risk weighted assets), Ratio [Abstract] |  |
Actual Ratio | 17.33% | 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 | $ 536,992 | $ 501,537
For Capital Adequacy Purposes | 185,918 | 182,820
To Be Well-Capitalized Under Prompt Corrective Action Provision | $ 247,890 | $ 243,760
Tier I capital (to risk weighted assets), Ratio [Abstract] |  |
Actual Ratio | 17.33% | 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 | $ 573,155 | $ 537,944
For Capital Adequacy Purposes | 247,851 | 243,827
To Be Well-Capitalized Under Prompt Corrective Action Provision | $ 309,814 | $ 304,784
Total capital (to risk-weighted assets), Ratio [Abstract] |  |
Actual Ratio | 18.50% | 17.65%
For Capital Adequacy Purposes | 8.00% | 8.00%
To Be Well-Capitalized Under Prompt Corrective Action Provision | 10.00% | 10.00%

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