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Loans (Activity For The Accretable Yield And Carrying Amount Of Loans) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Virginia Savings Bank [Member]  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]  
Balance at the beginning of the period $ 698us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankMember
Accretion (288)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankMember
Net reclassifications to accretable from non-accretable 385us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankMember
Disposals (248)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankMember
Balance at the end of the period 547us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankMember
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities, Carrying Amount Net [Roll Forward]  
Balance at the beginning of the period 3,182us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankMember
Accretion 288chco_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountAccretion
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankMember
Payments received, net (1,506)chco_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountPaymentsReceivedNet
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankMember
Disposals 0chco_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountDisposals
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankMember
Balance at the end of the period 1,964us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankMember
Community Bank [Member]  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]  
Balance at the beginning of the period 10,389us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityBankMember
Accretion (2,725)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityBankMember
Net reclassifications to accretable from non-accretable 4,121us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityBankMember
Disposals (1,420)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityBankMember
Balance at the end of the period 10,365us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityBankMember
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities, Carrying Amount Net [Roll Forward]  
Balance at the beginning of the period 26,330us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityBankMember
Accretion 2,725chco_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountAccretion
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityBankMember
Payments received, net (13,690)chco_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountPaymentsReceivedNet
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityBankMember
Balance at the end of the period 15,365us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityBankMember
Virginia Savings Bank and Community Bank [Member]  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]  
Balance at the beginning of the period 11,087us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankandCommunityBankMember
Accretion (3,013)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankandCommunityBankMember
Net reclassifications to accretable from non-accretable 4,506us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankandCommunityBankMember
Disposals (1,668)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankandCommunityBankMember
Balance at the end of the period 10,912us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankandCommunityBankMember
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities, Carrying Amount Net [Roll Forward]  
Balance at the beginning of the period 29,512us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankandCommunityBankMember
Accretion 3,013chco_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountAccretion
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankandCommunityBankMember
Payments received, net (15,196)chco_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountPaymentsReceivedNet
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankandCommunityBankMember
Disposals 0chco_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountDisposals
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankandCommunityBankMember
Balance at the end of the period $ 17,329us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankandCommunityBankMember