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Investments (Aggregate Carrying And Approximate Market Values Of Held-To-Maturity Securities) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost | $ 90,786 us-gaap_HeldToMaturitySecurities | $ 4,117 us-gaap_HeldToMaturitySecurities
Securities held-to-maturity, Gross Unrealized Gains | 3,405 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains | 1,218 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
Securities held-to-maturity, Gross Unrealized Losses | 0 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses | 0 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
Securities held-to-maturity, Estimated Fair Value | 94,191 us-gaap_HeldToMaturitySecuritiesFairValue | 5,335 us-gaap_HeldToMaturitySecuritiesFairValue
US Government Agencies Debt Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost | 86,742 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | 0 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Securities held-to-maturity, Gross Unrealized Gains | 2,733 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | 0 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Securities held-to-maturity, Gross Unrealized Losses | 0 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | 0 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Securities held-to-maturity, Estimated Fair Value | 89,475 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | 0 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Trust preferred securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost | 4,044 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember | 4,117 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
Securities held-to-maturity, Gross Unrealized Gains | 672 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains / us-gaap_DebtSecurityAxis = us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember | 1,218 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains / us-gaap_DebtSecurityAxis = us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
Securities held-to-maturity, Gross Unrealized Losses | 0 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses / us-gaap_DebtSecurityAxis = us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember | 0 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses / us-gaap_DebtSecurityAxis = us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
Securities held-to-maturity, Estimated Fair Value | 4,716 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember | 5,335 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
Non-marketable Equity Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost | 9,857 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = chco_NonmarketableEquitySecuritiesMember | 13,343 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = chco_NonmarketableEquitySecuritiesMember
Securities held-to-maturity, Estimated Fair Value | 9,857 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = chco_NonmarketableEquitySecuritiesMember | 13,343 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = chco_NonmarketableEquitySecuritiesMember
Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost | 9,857 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember | 13,343 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
Securities held-to-maturity, Estimated Fair Value | $ 9,857 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember | $ 13,343 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember

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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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- Definition Amount of unrecognized gain before loss on investments in held-to-maturity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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- Definition Amount of unrecognized loss before gain on investments in held-to-maturity securities. Excludes write-down for other than temporary impairment (OTTI). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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