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Fair Value Measurements (Narrative) (Details)
 12 Months Ended
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