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Loans (Activity For The Accretable Yield) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
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 $ 428us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankMember
Accretion (58)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankMember
Net reclassifications to accretable yield from non-accretable yield 0us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankMember
Disposals 0us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankMember
Balance at the end of period 370us-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 1,964us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankMember
Accretion 58chco_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountAccretion
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankMember
Payments received, net (43)chco_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountPaymentsReceivedNet
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankMember
Disposals 0chco_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountDisposals
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankMember
Balance at the end of period 1,979us-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 9,906us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityBankMember
Accretion (669)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityBankMember
Net reclassifications to accretable yield from non-accretable yield 0us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityBankMember
Disposals (461)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityBankMember
Balance at the end of period 8,776us-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 15,365us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityBankMember
Accretion 669chco_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountAccretion
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityBankMember
Payments received, net (860)chco_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountPaymentsReceivedNet
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityBankMember
Disposals (547)chco_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountDisposals
/ us-gaap_BusinessAcquisitionAxis
= chco_CommunityBankMember
Balance at the end of period 14,627us-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 10,334us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankandCommunityBankMember
Accretion (727)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankandCommunityBankMember
Net reclassifications to accretable yield from non-accretable yield 0us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankandCommunityBankMember
Disposals (461)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankandCommunityBankMember
Balance at the end of period 9,146us-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 17,329us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankandCommunityBankMember
Accretion 727chco_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountAccretion
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankandCommunityBankMember
Payments received, net (903)chco_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountPaymentsReceivedNet
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankandCommunityBankMember
Disposals (547)chco_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountDisposals
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankandCommunityBankMember
Balance at the end of period $ 16,606us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_BusinessAcquisitionAxis
= chco_VirginiaSavingsBankandCommunityBankMember