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Fair Value Measurements (Schedule Of OREO Measured And Reported At Fair Value) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Other Real Estate [Roll Forward]    
Beginning Balance $ 8,470us-gaap_OtherRealEstate $ 8,162us-gaap_OtherRealEstate
Acquired 0us-gaap_OtherRealEstateAdditions 3,492us-gaap_OtherRealEstateAdditions
Disposals (5,573)us-gaap_OtherRealEstateDisposals (7,523)us-gaap_OtherRealEstateDisposals
Ending Balance 8,179us-gaap_OtherRealEstate 8,470us-gaap_OtherRealEstate
OREO Remeasured At Initial Recognition    
Other Real Estate [Roll Forward]    
Carrying value of foreclosed assets prior to remeasurement 5,746us-gaap_RealEstateAcquiredThroughForeclosure
/ chco_OtherRealEstateOwnedRemeasurementAtFairValueAxis
= chco_OreoRemeasuredAtInitialRecognitionMember
7,012us-gaap_RealEstateAcquiredThroughForeclosure
/ chco_OtherRealEstateOwnedRemeasurementAtFairValueAxis
= chco_OreoRemeasuredAtInitialRecognitionMember
Charge-offs recognized in the allowance for loan losses 0us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
/ chco_OtherRealEstateOwnedRemeasurementAtFairValueAxis
= chco_OreoRemeasuredAtInitialRecognitionMember
(1,565)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
/ chco_OtherRealEstateOwnedRemeasurementAtFairValueAxis
= chco_OreoRemeasuredAtInitialRecognitionMember
Fair value 5,746us-gaap_AssetsFairValueDisclosureNonrecurring
/ chco_OtherRealEstateOwnedRemeasurementAtFairValueAxis
= chco_OreoRemeasuredAtInitialRecognitionMember
5,447us-gaap_AssetsFairValueDisclosureNonrecurring
/ chco_OtherRealEstateOwnedRemeasurementAtFairValueAxis
= chco_OreoRemeasuredAtInitialRecognitionMember
OREO Remeasured Subsequent To Initial Recognition    
Other Real Estate [Roll Forward]    
Carrying value of foreclosed assets prior to remeasurement 1,632us-gaap_RealEstateAcquiredThroughForeclosure
/ chco_OtherRealEstateOwnedRemeasurementAtFairValueAxis
= chco_OreoRemeasuredSubsequentToInitialRecognitionMember
2,832us-gaap_RealEstateAcquiredThroughForeclosure
/ chco_OtherRealEstateOwnedRemeasurementAtFairValueAxis
= chco_OreoRemeasuredSubsequentToInitialRecognitionMember
Fair value 1,168us-gaap_AssetsFairValueDisclosureNonrecurring
/ chco_OtherRealEstateOwnedRemeasurementAtFairValueAxis
= chco_OreoRemeasuredSubsequentToInitialRecognitionMember
1,724us-gaap_AssetsFairValueDisclosureNonrecurring
/ chco_OtherRealEstateOwnedRemeasurementAtFairValueAxis
= chco_OreoRemeasuredSubsequentToInitialRecognitionMember
Write-downs included in other non-interest expense $ (464)chco_WriteDownsIncludedInOtherNoninterestExpense
/ chco_OtherRealEstateOwnedRemeasurementAtFairValueAxis
= chco_OreoRemeasuredSubsequentToInitialRecognitionMember
$ (1,108)chco_WriteDownsIncludedInOtherNoninterestExpense
/ chco_OtherRealEstateOwnedRemeasurementAtFairValueAxis
= chco_OreoRemeasuredSubsequentToInitialRecognitionMember