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Derivative Instruments (Change In Fair Value Of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Other Income Derivative Asset |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Change in Fair Value | $ 6,811 us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_IncomeStatementLocationAxis = chco_OtherIncomeDerivativeAssetMember | $ (10,148)us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_IncomeStatementLocationAxis = chco_OtherIncomeDerivativeAssetMember | $ 1,921 us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_IncomeStatementLocationAxis = chco_OtherIncomeDerivativeAssetMember
Other Income Derivative Liability |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Change in Fair Value | $ (6,811)us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_IncomeStatementLocationAxis = chco_OtherIncomeDerivativeLiabilityMember | $ 10,148 us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_IncomeStatementLocationAxis = chco_OtherIncomeDerivativeLiabilityMember | $ (1,921)us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_IncomeStatementLocationAxis = chco_OtherIncomeDerivativeLiabilityMember

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- Definition Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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