XML 115 R99.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Employee Benefit Plans (Summary Of Current Allocation Percentages Of Plan Assets) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Horizon Defined Benefit Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 100.00% |
Percentage of Plan Assets | 100.00% | 100.00%
Horizon Defined Benefit Plan | Common stocks |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 60.00% |
Percentage of Plan Assets | 55.00% | 48.00%
Horizon Defined Benefit Plan | Debt Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 20.00% |
Percentage of Plan Assets | 23.00% | 25.00%
Horizon Defined Benefit Plan | Cash and Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 5.00% |
Percentage of Plan Assets | 9.00% | 15.00%
Horizon Defined Benefit Plan | Alternative investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 15.00% |
Percentage of Plan Assets | 13.00% | 12.00%
Horizon Defined Benefit Plan | Minimum | Common stocks |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allowable-Allocation Range, Minimum | 0.35 |
Horizon Defined Benefit Plan | Minimum | Debt Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allowable-Allocation Range, Minimum | .1 |
Horizon Defined Benefit Plan | Minimum | Cash and Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allowable-Allocation Range, Minimum | 0.02 |
Horizon Defined Benefit Plan | Minimum | Alternative investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allowable-Allocation Range, Minimum | 0 |
Horizon Defined Benefit Plan | Maximum | Common stocks |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allowable-Allocation Range, Minimum | 0.88 |
Horizon Defined Benefit Plan | Maximum | Debt Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allowable-Allocation Range, Minimum | .4 |
Horizon Defined Benefit Plan | Maximum | Cash and Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allowable-Allocation Range, Minimum | 0.2 |
Horizon Defined Benefit Plan | Maximum | Alternative investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allowable-Allocation Range, Minimum | 0.25 |
Community Defined Benefit Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 100.00% |
Percentage of Plan Assets | 100.00% | 100.00%
Community Defined Benefit Plan | Common stocks |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 40.00% |
Percentage of Plan Assets | 39.00% | 41.00%
Community Defined Benefit Plan | Debt Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 60.00% |
Percentage of Plan Assets | 61.00% | 59.00%
Community Defined Benefit Plan | Minimum | Common stocks |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allowable-Allocation Range, Minimum | 0.29 |
Community Defined Benefit Plan | Minimum | Debt Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allowable-Allocation Range, Minimum | 0.49 |
Community Defined Benefit Plan | Maximum | Common stocks |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allowable-Allocation Range, Minimum | 0.51 |
Community Defined Benefit Plan | Maximum | Debt Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allowable-Allocation Range, Minimum | 0.71 |

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Description of target allocation percentages, or range of percentages, considering the major categories of plan assets as of the latest statement of financial position presented (on a weighted-average basis for employers with more than one plan) that are pertinent to an understanding of the plan investment policies and strategies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920 + Details
Name: | us-gaap_DefinedBenefitPlanTargetAllocationPercentage
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_MultiemployerPlanNameAxis=chco_HorizonDefinedBenefitPlanMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CashAndCashEquivalentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_HedgeFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MultiemployerPlanNameAxis=chco_CommunityDefinedBenefitPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |