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Regulatory Matters (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Tier I capital (to average assets), Amount [Abstract] |  |
Actual Amount | $ 496,432 | $ 468,304
For Capital Adequacy Purposes | $ 155,743 | $ 151,066
Tier I capital (to average assets), Ratio [Abstract] |  |
Actual Ratio | 12.75% | 12.40%
For Capital Adequacy Purposes | 4.00% | 4.00%
Common equity Tier 1 capital (to risk weighted assets), Amount [Abstract] |  |
Actual Amount | $ 436,932 | $ 408,804
For Capital Adequacy Purposes | $ 129,525 | $ 126,194
Common equity Tier 1 capital (to risk weighted assets), Ratio [Abstract] |  |
Actual Ratio | 15.18% | 14.58%
For Capital Adequacy Purposes | 4.50% | 4.50%
Tier I capital (to risk weighted assets), Amount [Abstract] |  |
Actual Amount | $ 496,432 | $ 468,304
For Capital Adequacy Purposes | $ 172,672 | $ 168,253
Tier I capital (to risk weighted assets), Ratio [Abstract] |  |
Actual Ratio | 17.25% | 16.70%
For Capital Adequacy Purposes | 6.00% | 6.00%
Total capital (to risk weighted assets), Amount [Abstract] |  |
Actual Amount | $ 532,332 | $ 503,296
For Capital Adequacy Purposes | $ 230,198 | $ 224,310
Total capital (to risk-weighted assets), Ratio [Abstract] |  |
Actual Ratio | 18.50% | 17.95%
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 | $ 55,400 |
Tier I capital (to average assets), Amount [Abstract] |  |
Actual Amount | 472,615 | $ 445,107
For Capital Adequacy Purposes | 155,083 | 150,374
To Be Well-Capitalized Under Prompt Corrective Action Provision | $ 193,854 | $ 187,967
Tier I capital (to average assets), Ratio [Abstract] |  |
Actual Ratio | 12.19% | 11.84%
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 | $ 472,615 | $ 445,107
For Capital Adequacy Purposes | 129,208 | 125,895
To Be Well-Capitalized Under Prompt Corrective Action Provision | $ 186,634 | $ 181,848
Common equity Tier 1 capital (to risk weighted assets), Ratio [Abstract] |  |
Actual Ratio | 16.46% | 15.91%
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 | $ 472,615 | $ 445,107
For Capital Adequacy Purposes | 172,278 | 167,859
To Be Well-Capitalized Under Prompt Corrective Action Provision | $ 229,704 | $ 223,812
Tier I capital (to risk weighted assets), Ratio [Abstract] |  |
Actual Ratio | 16.46% | 15.91%
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 | $ 508,515 | $ 480,099
For Capital Adequacy Purposes | 229,708 | 223,822
To Be Well-Capitalized Under Prompt Corrective Action Provision | $ 287,134 | $ 279,778
Total capital (to risk-weighted assets), Ratio [Abstract] |  |
Actual Ratio | 17.71% | 17.16%
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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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 + Details
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