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Acquisitions (Acquired Loans At Acquisition) (Details) (Community Bank [Member], USD $)
In Thousands, unless otherwise specified
Jan. 10, 2013
Community Bank [Member]
 
Business Acquisition [Line Items]  
Contractually required principal and interest $ 55,983us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember
Contractual cash flows not expected to be collected (non-accretable difference) (19,758)us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember
Expected cash flows 36,225us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember
Interest component of expected cash flows (accretable difference) (5,469)us-gaap_CertainLoansAcquiredInTransferAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 30,756us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember
Carry Value of Loans at Acquisition Date 356,822chco_CarryValueofLoansatAcquisitionDate
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember
Fair Value Adjustment for NonCredit Impaired Loans (15,409)chco_FairValueAdjustmentforNonCreditImpairedLoansAcquired
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember
Fair Value of NonCredit Impaired Loans $ 341,413chco_FairValueofNonCreditImpairedLoans
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityFinancialCorporationMember