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Commitments And Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Standby Letters Of Credit [Member]
Commitments And Contingencies [Line Items]
Contractual obligations	$ 4,727us-gaap_CommitmentsAndContingencies / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_StandbyLettersOfCreditMember	$ 4,592us-gaap_CommitmentsAndContingencies / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_StandbyLettersOfCreditMember
Commercial Letters Of Credit [Member]
Commitments And Contingencies [Line Items]
Contractual obligations	1,941us-gaap_CommitmentsAndContingencies / us-gaap_LossContingenciesByNatureOfContingencyAxis = chco_CommercialLettersOfCreditMember	1,991us-gaap_CommitmentsAndContingencies / us-gaap_LossContingenciesByNatureOfContingencyAxis = chco_CommercialLettersOfCreditMember
Home equity - junior liens (including lines of credit) [Member] | Commitments To Extend Credit [Member]
Commitments And Contingencies [Line Items]
Contractual obligations	177,034us-gaap_CommitmentsAndContingencies / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember	175,312us-gaap_CommitmentsAndContingencies / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember
Commercial Real Estate [Member] | Commitments To Extend Credit [Member]
Commitments And Contingencies [Line Items]
Contractual obligations	47,275us-gaap_CommitmentsAndContingencies / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember	50,298us-gaap_CommitmentsAndContingencies / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember
Other Commitments [Member] | Commitments To Extend Credit [Member]
Commitments And Contingencies [Line Items]
Contractual obligations	$ 154,050us-gaap_CommitmentsAndContingencies / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = chco_OtherCommitmentsMember	$ 145,283us-gaap_CommitmentsAndContingencies / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = chco_OtherCommitmentsMember

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Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.25)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 25

-Article 5



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 19

-Article 7



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 17

-Article 9



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.17)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 7: 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.(a),19)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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