Allowance For Loan Losses (Schedule Of Troubled Debt Restructurings) (Details) $ in Thousands	3 Months Ended
Mar. 31, 2016 USD ($) contract	Mar. 31, 2015 USD ($) contract	Dec. 31, 2015 USD ($)
Financing Receivable, Modifications [Line Items]
Accruing	$ 21,761		$ 22,259
Non-Accruing	36		225
Total	$ 21,797		22,484
Financing Receivable, Modifications, Number of Contracts \| contract	9	24
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 770	$ 1,592
Financing Receivable, Modifications, Post-Modification Recorded Investment	770	$ 1,592
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Accruing	54		58
Non-Accruing	0		0
Total	$ 54		58
Financing Receivable, Modifications, Number of Contracts \| contract	0	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	$ 0
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Accruing	523		1,746
Non-Accruing	0		0
Total	$ 523		1,746
Financing Receivable, Modifications, Number of Contracts \| contract	0	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	$ 0
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Accruing	18,306		17,796
Non-Accruing	36		191
Total	$ 18,342		17,987
Financing Receivable, Modifications, Number of Contracts \| contract	8	17
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 741	$ 1,405
Financing Receivable, Modifications, Post-Modification Recorded Investment	741	$ 1,405
Home equity - junior lien [Member]
Financing Receivable, Modifications [Line Items]
Accruing	2,878		2,659
Non-Accruing	0		34
Total	$ 2,878		2,693
Financing Receivable, Modifications, Number of Contracts \| contract	1	7
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 29	$ 187
Financing Receivable, Modifications, Post-Modification Recorded Investment	29	$ 187
Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Accruing	0		0
Non-Accruing	0		0
Total	$ 0		$ 0
Financing Receivable, Modifications, Number of Contracts \| contract	0	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 0

Financing Receivable Modifications Recorded Investment Non Accruing Status For Troubled Debt Restructurings.

No definition available.

Name:	chco_FinancingReceivableModificationsRecordedInvestmentNonAccruingStatus
Namespace Prefix:	chco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing Receivable Recorded Investment Accrual Status For Troubled Debt Restructurings

+ References

No definition available.

+ Details

Name:	chco_FinancingReceivableRecordedInvestmentAccrualStatus
Namespace Prefix:	chco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

+ Details

Name:	us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_HomeEquityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: