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Income Taxes (Summary Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Income Tax Disclosure [Abstract] |  |
Previously securitized loans | $ 4,703 chco_DeferredTaxAssetsPreviouslySecuritizedLoans | $ 5,166 chco_DeferredTaxAssetsPreviouslySecuritizedLoans
Allowance for loan losses | 7,413 chco_DeferredTaxAssetsAllowanceForLoanLosses | 7,566 chco_DeferredTaxAssetsAllowanceForLoanLosses
Deferred compensation payable | 3,966 chco_DeferredTaxAssetsDeferredCompensationPayable | 3,774 chco_DeferredTaxAssetsDeferredCompensationPayable
Underfunded pension liability | 3,113 chco_DeferredTaxAssetsUnderfundedPensionLiability | 1,675 chco_DeferredTaxAssetsUnderfundedPensionLiability
Accrued expenses | 2,451 chco_DeferredTaxAssetsAccruedExpenses | 2,830 chco_DeferredTaxAssetsAccruedExpenses
Impaired assets | 1,172 chco_DeferredTaxAssetsImpairedPropertyPlantAndEquipment | 1,028 chco_DeferredTaxAssetsImpairedPropertyPlantAndEquipment
Impaired security losses | 8,377 chco_DeferredTaxAssetsImpairedSecurityLosses | 9,519 chco_DeferredTaxAssetsImpairedSecurityLosses
Unrealized securities losses | 0 us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross | 1,230 us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross
Intangible assets | 4,946 chco_DeferredTaxAssetsIntangibleAssets | 8,081 chco_DeferredTaxAssetsIntangibleAssets
Other | 3,292 us-gaap_DeferredTaxAssetsOther | 3,109 us-gaap_DeferredTaxAssetsOther
Total Deferred Tax Assets | 39,433 us-gaap_DeferredTaxAssetsGross | 43,978 us-gaap_DeferredTaxAssetsGross
Unrealized securities gains | 741 us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities | 0 us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities
Other | 1,926 us-gaap_DeferredTaxLiabilitiesOther | 1,813 us-gaap_DeferredTaxLiabilitiesOther
Total Deferred Tax Liabilities | 2,667 us-gaap_DeferredTaxLiabilities | 1,813 us-gaap_DeferredTaxLiabilities
Net Deferred Tax Assets | $ 36,766 us-gaap_DeferredTaxAssetsNet | $ 42,165 us-gaap_DeferredTaxAssetsNet

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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