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Loans (Composition of Loans Acquired) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |
Gross loans | $ 2,652,066 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | $ 2,606,197 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Virginia Savings Bank [Member] |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |
Gross loans | 38,345 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = chco_VirginiaSavingsBankMember | 48,833 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = chco_VirginiaSavingsBankMember
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net | 1,964 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_BusinessAcquisitionAxis = chco_VirginiaSavingsBankMember | 3,182 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_BusinessAcquisitionAxis = chco_VirginiaSavingsBankMember
Contractually required principal and interest | 2,407 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition / us-gaap_BusinessAcquisitionAxis = chco_VirginiaSavingsBankMember | 3,932 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition / us-gaap_BusinessAcquisitionAxis = chco_VirginiaSavingsBankMember
Community Bank [Member] |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |
Gross loans | 219,923 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = chco_CommunityBankMember | 279,890 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = chco_CommunityBankMember
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net | 15,365 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_BusinessAcquisitionAxis = chco_CommunityBankMember | 26,330 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_BusinessAcquisitionAxis = chco_CommunityBankMember
Contractually required principal and interest | 23,277 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition / us-gaap_BusinessAcquisitionAxis = chco_CommunityBankMember | 38,566 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition / us-gaap_BusinessAcquisitionAxis = chco_CommunityBankMember
Virginia Savings Bank and Community Bank [Member] |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |
Gross loans | 258,268 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = chco_VirginiaSavingsBankandCommunityBankMember | 328,723 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = chco_VirginiaSavingsBankandCommunityBankMember
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net | 17,329 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_BusinessAcquisitionAxis = chco_VirginiaSavingsBankandCommunityBankMember | 29,512 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_BusinessAcquisitionAxis = chco_VirginiaSavingsBankandCommunityBankMember
Contractually required principal and interest | $ 25,684 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition / us-gaap_BusinessAcquisitionAxis = chco_VirginiaSavingsBankandCommunityBankMember | $ 42,498 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition / us-gaap_BusinessAcquisitionAxis = chco_VirginiaSavingsBankandCommunityBankMember

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- Definition Amount of contractually required payments receivable at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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