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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2017
Regulatory Matters [Abstract] |
Capital Amounts and Ratios | Consolidated Capital Ratios
|  | Actual |  |  | For Capital Adequacy Purposes |
(in thousands) |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
As of December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 capital (to average assets) |  | $ | 525,707 |  |  |  | 12.89 | % |  | $ | 163,136 |  |  |  | 4.00 | %
Common equity Tier 1 capital (to risk weighted assets) |  |  | 468,207 |  |  |  | 15.33 |  |  |  | 137,438 |  |  |  | 4.50 |
Tier 1 capital (to risk weighted assets) |  |  | 525,707 |  |  |  | 17.22 |  |  |  | 183,173 |  |  |  | 6.00 |
Total capital (to risk weighted assets) |  |  | 562,114 |  |  |  | 18.41 |  |  |  | 244,265 |  |  |  | 8.00 |
As of December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 capital (to average assets) |  | $ | 496,432 |  |  |  | 12.75 | % |  | $ | 155,743 |  |  |  | 4.00 | %
Common equity Tier 1 capital (to risk weighted assets) |  |  | 436,932 |  |  |  | 15.18 |  |  |  | 129,525 |  |  |  | 4.50 |
Tier 1 capital (to risk weighted assets) |  |  | 496,432 |  |  |  | 17.25 |  |  |  | 172,672 |  |  |  | 6.00 |
Total capital (to risk weighted assets) |  |  | 532,332 |  |  |  | 18.50 |  |  |  | 230,198 |  |  |  | 8.00 |
Community Trust Bank, Inc.’s Capital Ratios
|  | Actual |  |  | For Capital Adequacy Purposes |  |  | To Be Well-Capitalized Under Prompt Corrective Action Provision |
(in thousands) |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
As of December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 capital (to average assets) |  | $ | 501,537 |  |  |  | 12.35 | % |  | $ | 162,441 |  |  |  | 4.00 | % |  | $ | 203,051 |  |  |  | 5.00 | %
Common equity Tier 1 capital (to risk weighted assets) |  |  | 501,537 |  |  |  | 16.46 |  |  |  | 137,115 |  |  |  | 4.50 |  |  |  | 198,055 |  |  |  | 6.50 |
Tier 1 capital (to risk weighted assets) |  |  | 501,537 |  |  |  | 16.46 |  |  |  | 182,820 |  |  |  | 6.00 |  |  |  | 243,760 |  |  |  | 8.00 |
Total capital (to risk weighted assets) |  |  | 537,944 |  |  |  | 17.65 |  |  |  | 243,827 |  |  |  | 8.00 |  |  |  | 304,784 |  |  |  | 10.00 |
As of December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 capital (to average assets) |  | $ | 472,615 |  |  |  | 12.19 | % |  | $ | 155,083 |  |  |  | 4.00 | % |  | $ | 193,854 |  |  |  | 5.00 | %
Common equity Tier 1 capital (to risk weighted assets) |  |  | 472,615 |  |  |  | 16.46 |  |  |  | 129,208 |  |  |  | 4.50 |  |  |  | 186,634 |  |  |  | 6.50 |
Tier 1 capital (to risk weighted assets) |  |  | 472,615 |  |  |  | 16.46 |  |  |  | 172,278 |  |  |  | 6.00 |  |  |  | 229,704 |  |  |  | 8.00 |
Total capital (to risk weighted assets) |  |  | 508,515 |  |  |  | 17.71 |  |  |  | 229,708 |  |  |  | 8.00 |  |  |  | 287,134 |  |  |  | 10.00 |

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