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Employee Benefit Plans (Summary Of Activity Within The Defined Benefit Plan) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value at beginning of measurement period $ 14,726us-gaap_DefinedBenefitPlanFairValueOfPlanAssets $ 9,663us-gaap_DefinedBenefitPlanFairValueOfPlanAssets  
Acquisition 0us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsPlanAssets 4,558us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsPlanAssets  
Actual gain (loss) on plan assets 496us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets 1,412us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets  
Contributions 409us-gaap_DefinedBenefitPlanContributionsByEmployer 538us-gaap_DefinedBenefitPlanContributionsByEmployer  
Benefits paid 964us-gaap_DefinedBenefitPlanBenefitsPaid 1,445us-gaap_DefinedBenefitPlanBenefitsPaid  
Fair value at End of measurement period 14,667us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 14,726us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 9,663us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of measurement period (17,524)us-gaap_DefinedBenefitPlanBenefitObligation (13,827)us-gaap_DefinedBenefitPlanBenefitObligation  
Acquisition 0us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation (6,297)us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation  
Interest cost (836)us-gaap_DefinedBenefitPlanInterestCost (776)us-gaap_DefinedBenefitPlanInterestCost (635)us-gaap_DefinedBenefitPlanInterestCost
Actuarial loss (3,994)us-gaap_DefinedBenefitPlanActuarialGainLoss 1,931us-gaap_DefinedBenefitPlanActuarialGainLoss  
Benefit obligation at end of measurement period (21,390)us-gaap_DefinedBenefitPlanBenefitObligation (17,524)us-gaap_DefinedBenefitPlanBenefitObligation (13,827)us-gaap_DefinedBenefitPlanBenefitObligation
Funded status (6,723)us-gaap_DefinedBenefitPlanFundedStatusOfPlan (2,798)us-gaap_DefinedBenefitPlanFundedStatusOfPlan  
Unrecognized net actuarial gain 8,461chco_DefinedBenefitPlanUnrecognizedActuarialGainLoss 4,555chco_DefinedBenefitPlanUnrecognizedActuarialGainLoss  
Other comprehensive loss (8,461)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossAfterTax (4,555)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossAfterTax  
Accrued Benefit Cost $ (6,723)us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation $ (2,798)us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation  
Weighted-average assumptions for balance sheet liability at end of year, Discount rate 3.93%chco_DefinedBenefitPlanAssumptionsUsedCalculatingBalanceSheetLiabilityDiscountRate 4.89%chco_DefinedBenefitPlanAssumptionsUsedCalculatingBalanceSheetLiabilityDiscountRate  
Weighted-average assumptions for balance sheet liability at end of year, Expected long-term rate of return 6.92%chco_DefinedBenefitPlanAssumptionsUsedCalculatingBalanceSheetLiabilityExpectedLongTermRateOfReturn 7.35%chco_DefinedBenefitPlanAssumptionsUsedCalculatingBalanceSheetLiabilityExpectedLongTermRateOfReturn  
Weighted-average assumptions for benefit cost at beginning of year, Discount rate 4.89%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate 4.31%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate  
Weighted-average assumptions for benefit cost at beginning of year, Expected long-term rate of return 7.35%chco_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermRateOfReturn 7.46%chco_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermRateOfReturn