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Loans (Composition Of Loans Acquired At Acquisition) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Financing Receivable, Impaired [Line Items] |  |
Outstanding loan balance | $ 2,632,471 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | $ 2,652,066 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Virginia Savings Bank [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Outstanding loan balance | 37,270 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = chco_VirginiaSavingsBankMember | 38,345 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = chco_VirginiaSavingsBankMember
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net | 1,979 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_BusinessAcquisitionAxis = chco_VirginiaSavingsBankMember | 1,964 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_BusinessAcquisitionAxis = chco_VirginiaSavingsBankMember
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance | 2,419 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance / us-gaap_BusinessAcquisitionAxis = chco_VirginiaSavingsBankMember | 2,407 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance / us-gaap_BusinessAcquisitionAxis = chco_VirginiaSavingsBankMember
Community Bank [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Outstanding loan balance | 217,603 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = chco_CommunityBankMember | 219,923 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = chco_CommunityBankMember
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net | 14,627 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_BusinessAcquisitionAxis = chco_CommunityBankMember | 15,365 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_BusinessAcquisitionAxis = chco_CommunityBankMember
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance | 20,189 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance / us-gaap_BusinessAcquisitionAxis = chco_CommunityBankMember | 23,277 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance / us-gaap_BusinessAcquisitionAxis = chco_CommunityBankMember
Virginia Savings Bank And Community Financial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Outstanding loan balance | 254,873 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = chco_VirginiaSavingsBankAndCommunityFinancialMember | 258,268 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = chco_VirginiaSavingsBankAndCommunityFinancialMember
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net | 16,606 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_BusinessAcquisitionAxis = chco_VirginiaSavingsBankAndCommunityFinancialMember | 17,329 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_BusinessAcquisitionAxis = chco_VirginiaSavingsBankAndCommunityFinancialMember
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance | $ 22,608 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance / us-gaap_BusinessAcquisitionAxis = chco_VirginiaSavingsBankAndCommunityFinancialMember | $ 25,684 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance / us-gaap_BusinessAcquisitionAxis = chco_VirginiaSavingsBankAndCommunityFinancialMember

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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 The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as 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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