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

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- Definition Restricted shares average market price at grant. + References No definition available. + Details
Name: | chco_RestrictedSharesAverageMarketPriceAtGrant
Namespace Prefix: | chco_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- 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

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- 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

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

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- 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