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Employee Benefit Plans (Restricted Shares Activity And Related Information) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation [Abstract]
Restricted Awards, beginning balance	142,469chco_RestrictedStockSharesOutstanding	116,711chco_RestrictedStockSharesOutstanding	108,209chco_RestrictedStockSharesOutstanding
Restricted Awards, Granted	27,162chco_StockIssuedDuringPeriodSharesRestrictedStockAwardGranted	35,083chco_StockIssuedDuringPeriodSharesRestrictedStockAwardGranted	23,336chco_StockIssuedDuringPeriodSharesRestrictedStockAwardGranted
Restricted Awards, Forfeited/Vested	(6,200)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited	(9,325)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited	(14,834)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited
Restricted Awards, ending balance	163,431chco_RestrictedStockSharesOutstanding	142,469chco_RestrictedStockSharesOutstanding	116,711chco_RestrictedStockSharesOutstanding
Average Market Price at Grant, Granted	$ 39.72chco_RestrictedSharesAverageMarketPriceAtGrant	$ 38.07chco_RestrictedSharesAverageMarketPriceAtGrant	$ 34.94chco_RestrictedSharesAverageMarketPriceAtGrant

X

- Definition

Restricted shares average market price at grant.

+ References

No definition available.

+ Details

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Namespace Prefix:	chco_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Restricted Stock Shares Outstanding

+ References

No definition available.

+ Details

Name:	chco_RestrictedStockSharesOutstanding
Namespace Prefix:	chco_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Stock issued during period, shares, restricted stock award, granted.

+ References

No definition available.

+ Details

Name:	chco_StockIssuedDuringPeriodSharesRestrictedStockAwardGranted
Namespace Prefix:	chco_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Definition

Number of shares related to Restricted Stock Award forfeited during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration