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Regulatory Matters (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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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%

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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=84167132&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=84167132&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=84167132&loc=d3e65071-112826 + Details
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