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Employee Benefit Plans (Summary Of Current Allocation Percentages Of Plan Assets) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Horizon Defined Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	100.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_MultiemployerPlanNameAxis = chco_HorizonDefinedBenefitPlanMemberMember
Percentage of Plan Assets	100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_MultiemployerPlanNameAxis = chco_HorizonDefinedBenefitPlanMemberMember	100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_MultiemployerPlanNameAxis = chco_HorizonDefinedBenefitPlanMemberMember
Horizon Defined Benefit Plan | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	65.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_MultiemployerPlanNameAxis = chco_HorizonDefinedBenefitPlanMemberMember
Allowable-Allocation Range, Minimum	40.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_MultiemployerPlanNameAxis = chco_HorizonDefinedBenefitPlanMemberMember
Allowable-Allocation Range, Maximum	100.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_MultiemployerPlanNameAxis = chco_HorizonDefinedBenefitPlanMemberMember
Percentage of Plan Assets	53.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_MultiemployerPlanNameAxis = chco_HorizonDefinedBenefitPlanMemberMember	53.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_MultiemployerPlanNameAxis = chco_HorizonDefinedBenefitPlanMemberMember
Horizon Defined Benefit Plan | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	18.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_MultiemployerPlanNameAxis = chco_HorizonDefinedBenefitPlanMemberMember
Allowable-Allocation Range, Minimum	20.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_MultiemployerPlanNameAxis = chco_HorizonDefinedBenefitPlanMemberMember
Allowable-Allocation Range, Maximum	40.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_MultiemployerPlanNameAxis = chco_HorizonDefinedBenefitPlanMemberMember
Percentage of Plan Assets	23.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_MultiemployerPlanNameAxis = chco_HorizonDefinedBenefitPlanMemberMember	28.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_MultiemployerPlanNameAxis = chco_HorizonDefinedBenefitPlanMemberMember
Horizon Defined Benefit Plan | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	2.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_MultiemployerPlanNameAxis = chco_HorizonDefinedBenefitPlanMemberMember
Allowable-Allocation Range, Minimum	3.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_MultiemployerPlanNameAxis = chco_HorizonDefinedBenefitPlanMemberMember
Allowable-Allocation Range, Maximum	10.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_MultiemployerPlanNameAxis = chco_HorizonDefinedBenefitPlanMemberMember
Percentage of Plan Assets	9.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_MultiemployerPlanNameAxis = chco_HorizonDefinedBenefitPlanMemberMember	7.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_MultiemployerPlanNameAxis = chco_HorizonDefinedBenefitPlanMemberMember
Horizon Defined Benefit Plan | Other Securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	15.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = chco_OtherSecuritesMember / us-gaap_MultiemployerPlanNameAxis = chco_HorizonDefinedBenefitPlanMemberMember
Allowable-Allocation Range, Minimum	0.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = chco_OtherSecuritesMember / us-gaap_MultiemployerPlanNameAxis = chco_HorizonDefinedBenefitPlanMemberMember
Allowable-Allocation Range, Maximum	15.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = chco_OtherSecuritesMember / us-gaap_MultiemployerPlanNameAxis = chco_HorizonDefinedBenefitPlanMemberMember
Percentage of Plan Assets	15.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = chco_OtherSecuritesMember / us-gaap_MultiemployerPlanNameAxis = chco_HorizonDefinedBenefitPlanMemberMember	12.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = chco_OtherSecuritesMember / us-gaap_MultiemployerPlanNameAxis = chco_HorizonDefinedBenefitPlanMemberMember
Community Defined Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	100.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_MultiemployerPlanNameAxis = chco_CommunityDefinedBenefitPlanMember
Percentage of Plan Assets	100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_MultiemployerPlanNameAxis = chco_CommunityDefinedBenefitPlanMember
Community Defined Benefit Plan | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	25.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_MultiemployerPlanNameAxis = chco_CommunityDefinedBenefitPlanMember
Allowable-Allocation Range, Minimum	20.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_MultiemployerPlanNameAxis = chco_CommunityDefinedBenefitPlanMember
Allowable-Allocation Range, Maximum	30.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_MultiemployerPlanNameAxis = chco_CommunityDefinedBenefitPlanMember
Percentage of Plan Assets	26.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_MultiemployerPlanNameAxis = chco_CommunityDefinedBenefitPlanMember
Community Defined Benefit Plan | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	75.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_MultiemployerPlanNameAxis = chco_CommunityDefinedBenefitPlanMember
Allowable-Allocation Range, Minimum	70.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_MultiemployerPlanNameAxis = chco_CommunityDefinedBenefitPlanMember
Allowable-Allocation Range, Maximum	80.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_MultiemployerPlanNameAxis = chco_CommunityDefinedBenefitPlanMember
Percentage of Plan Assets	74.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_MultiemployerPlanNameAxis = chco_CommunityDefinedBenefitPlanMember

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ 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=28361610&loc=d3e1928-114920



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

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Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ 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=28361610&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=28361610&loc=d3e2446-114920

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Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ 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=28361610&loc=d3e1928-114920



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(i)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920

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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=28361610&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=28361610&loc=d3e1928-114920

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