XML 88 R69.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Fair Value Measurements (Narrative) (Details) | 9 Months Ended | 12 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 Maximum [Member] | Sep. 30, 2013 Maximum [Member] | Sep. 30, 2014 Minimum [Member] | Sep. 30, 2013 Minimum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Fair Value Inputs, Prepayment Rate | 1.00% | 1.00% |  |  |  |
Annual prepayments maturity | 100.00% | 100.00% |  |  |  |
Additional basis points | 1.50% | 1.50% |  |  |  |
Collateral discount |  |  | 30.00% | 30.00% | 20.00% | 20.00%

X
- Definition Additional basis points, annual defaults from banks. + References No definition available. + Details
Name: | chco_AdditionalBasisPointsAnnualDefaultsFromBanks
Namespace Prefix: | chco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Annual prepayments maturity, percentage. + References No definition available. + Details
Name: | chco_AnnualPrepaymentsMaturityPercentage
Namespace Prefix: | chco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Unobservable Inputs Fair Value Measurement Collateral Discount Percent + References No definition available. + Details
Name: | chco_UnobservableInputsFairValueMeasurementCollateralDiscountPercent
Namespace Prefix: | chco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueInputsPrepaymentRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration