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Acquisitions (Schedule Of Business Acquisition) (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended
Jan. 10, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Identifiable liabilities:        
Beginning balance   $ 71,401us-gaap_Goodwill $ 71,401us-gaap_Goodwill $ 62,988us-gaap_Goodwill
Gross carrying amount   8,387us-gaap_FiniteLivedCoreDepositsGross 8,387us-gaap_FiniteLivedCoreDepositsGross  
Community Bank [Member]        
Consideration:        
Cash 12,738us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember
     
Common stock 27,783us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember
     
Warrant issued 725us-gaap_BusinessCombinationConsiderationTransferredOther1
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember
     
Purchase price 41,246us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember
     
Identifiable assets:        
Cash and cash equivalents 8,888us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember
     
Investment securities 17,659us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember
     
Loans 372,169us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember
     
Bank owned life insurance 6,935chco_BusinessAcquisitionPurchasePriceAllocationBankOwnedLifeInsurance
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember
     
Premises and equipment 8,950us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember
     
Deferred tax asset, net 15,228us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember
     
Other assets 7,989us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember
     
Total identifiable assets 437,818us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember
     
Identifiable liabilities:        
Deposits 383,070chco_BusinessAcquisitionPurchasePriceAllocationDeposits
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember
     
Other liabilities 24,484us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember
     
Total identifiable liabilities 407,554us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember
     
Net identifiable assets 30,264us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember
     
Beginning balance 8,271us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember
     
Gross carrying amount $ 2,711us-gaap_FiniteLivedCoreDepositsGross
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember