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v2.4.1.9

Fair Value Measurements (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value Inputs, Prepayment Rate | 1.00%us-gaap_FairValueInputsPrepaymentRate | 1.00%us-gaap_FairValueInputsPrepaymentRate
Annual prepayments maturity | 100.00%chco_AnnualPrepaymentsMaturityPercentage | 100.00%chco_AnnualPrepaymentsMaturityPercentage
Additional basis points | 150.00%chco_AdditionalBasisPointsAnnualDefaultsFromBanks | 150.00%chco_AdditionalBasisPointsAnnualDefaultsFromBanks
Minimum |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Collateral discount | 20.00%chco_UnobservableInputsFairValueMeasurementCollateralDiscountPercent / us-gaap_RangeAxis = us-gaap_MinimumMember | 20.00%chco_UnobservableInputsFairValueMeasurementCollateralDiscountPercent / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Collateral discount | 30.00%chco_UnobservableInputsFairValueMeasurementCollateralDiscountPercent / us-gaap_RangeAxis = us-gaap_MaximumMember | 30.00%chco_UnobservableInputsFairValueMeasurementCollateralDiscountPercent / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition Additional basis points, annual defaults from banks. + References No definition available. + Details
Name: | chco_AdditionalBasisPointsAnnualDefaultsFromBanks
Namespace Prefix: | chco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Annual prepayments maturity, percentage. + References No definition available. + Details
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Namespace Prefix: | chco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Unobservable Inputs Fair Value Measurement Collateral Discount Percent + References No definition available. + Details
Name: | chco_UnobservableInputsFairValueMeasurementCollateralDiscountPercent
Namespace Prefix: | chco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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