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Fair Value Measurements (Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring And Nonrecurring Basis) (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Obligations Of States And Political Subdivisions [Member] | Dec. 31, 2013 Obligations Of States And Political Subdivisions [Member] | Sep. 30, 2014 Obligations Of States And Political Subdivisions [Member] Level 1 [Member] | Dec. 31, 2013 Obligations Of States And Political Subdivisions [Member] Level 1 [Member] | Sep. 30, 2014 Obligations Of States And Political Subdivisions [Member] Level 2 [Member] | Dec. 31, 2013 Obligations Of States And Political Subdivisions [Member] Level 2 [Member] | Sep. 30, 2014 Obligations Of States And Political Subdivisions [Member] Level 3 [Member] | Dec. 31, 2013 Obligations Of States And Political Subdivisions [Member] Level 3 [Member] | Sep. 30, 2014 U.S. Government Agencies [Member] | Dec. 31, 2013 U.S. Government Agencies [Member] | Sep. 30, 2014 U.S. Government Agencies [Member] Level 1 [Member] | Dec. 31, 2013 U.S. Government Agencies [Member] Level 1 [Member] | Sep. 30, 2014 U.S. Government Agencies [Member] Level 2 [Member] | Dec. 31, 2013 U.S. Government Agencies [Member] Level 2 [Member] | Sep. 30, 2014 U.S. Government Agencies [Member] Level 3 [Member] | Dec. 31, 2013 U.S. Government Agencies [Member] Level 3 [Member] | Sep. 30, 2014 U.S. Government Agencies Mortgage-backed Securities [Member] | Dec. 31, 2013 U.S. Government Agencies Mortgage-backed Securities [Member] | Sep. 30, 2014 U.S. Government Agencies Mortgage-backed Securities [Member] Level 1 [Member] | Dec. 31, 2013 U.S. Government Agencies Mortgage-backed Securities [Member] Level 1 [Member] | Sep. 30, 2014 U.S. Government Agencies Mortgage-backed Securities [Member] Level 2 [Member] | Dec. 31, 2013 U.S. Government Agencies Mortgage-backed Securities [Member] Level 2 [Member] | Sep. 30, 2014 U.S. Government Agencies Mortgage-backed Securities [Member] Level 3 [Member] | Dec. 31, 2013 U.S. Government Agencies Mortgage-backed Securities [Member] Level 3 [Member] | Sep. 30, 2014 Private Label [Member] | Dec. 31, 2013 Private Label [Member] | Sep. 30, 2014 Private Label [Member] Level 1 [Member] | Dec. 31, 2013 Private Label [Member] Level 1 [Member] | Sep. 30, 2014 Private Label [Member] Level 2 [Member] | Dec. 31, 2013 Private Label [Member] Level 2 [Member] | Sep. 30, 2014 Private Label [Member] Level 3 [Member] | Dec. 31, 2013 Private Label [Member] Level 3 [Member] | Sep. 30, 2014 Trust Preferred Securities [Member] | Dec. 31, 2013 Trust Preferred Securities [Member] | Sep. 30, 2014 Trust Preferred Securities [Member] Level 1 [Member] | Dec. 31, 2013 Trust Preferred Securities [Member] Level 1 [Member] | Sep. 30, 2014 Trust Preferred Securities [Member] Level 2 [Member] | Dec. 31, 2013 Trust Preferred Securities [Member] Level 2 [Member] | Sep. 30, 2014 Trust Preferred Securities [Member] Level 3 [Member] | Dec. 31, 2013 Trust Preferred Securities [Member] Level 3 [Member] | Sep. 30, 2014 Corporate Securities [Member] | Dec. 31, 2013 Corporate Securities [Member] | Sep. 30, 2014 Corporate Securities [Member] Level 1 [Member] | Dec. 31, 2013 Corporate Securities [Member] Level 1 [Member] | Sep. 30, 2014 Corporate Securities [Member] Level 2 [Member] | Dec. 31, 2013 Corporate Securities [Member] Level 2 [Member] | Sep. 30, 2014 Corporate Securities [Member] Level 3 [Member] | Dec. 31, 2013 Corporate Securities [Member] Level 3 [Member] | Sep. 30, 2014 Marketable Equity Securities [Member] | Dec. 31, 2013 Marketable Equity Securities [Member] | Sep. 30, 2014 Marketable Equity Securities [Member] Level 1 [Member] | Dec. 31, 2013 Marketable Equity Securities [Member] Level 1 [Member] | Sep. 30, 2014 Marketable Equity Securities [Member] Level 2 [Member] | Dec. 31, 2013 Marketable Equity Securities [Member] Level 2 [Member] | Sep. 30, 2014 Marketable Equity Securities [Member] Level 3 [Member] | Dec. 31, 2013 Marketable Equity Securities [Member] Level 3 [Member] | Sep. 30, 2014 Investment Funds [Member] | Dec. 31, 2013 Investment Funds [Member] | Sep. 30, 2014 Investment Funds [Member] Level 1 [Member] | Dec. 31, 2013 Investment Funds [Member] Level 1 [Member] | Sep. 30, 2014 Investment Funds [Member] Level 2 [Member] | Dec. 31, 2013 Investment Funds [Member] Level 2 [Member] | Sep. 30, 2014 Investment Funds [Member] Level 3 [Member] | Dec. 31, 2013 Investment Funds [Member] Level 3 [Member] | Sep. 30, 2014 Derivative Assets [Member] | Dec. 31, 2013 Derivative Assets [Member] | Sep. 30, 2014 Derivative Assets [Member] Level 1 [Member] | Dec. 31, 2013 Derivative Assets [Member] Level 1 [Member] | Sep. 30, 2014 Derivative Assets [Member] Level 2 [Member] | Dec. 31, 2013 Derivative Assets [Member] Level 2 [Member] | Sep. 30, 2014 Derivative Assets [Member] Level 3 [Member] | Dec. 31, 2013 Derivative Assets [Member] Level 3 [Member] | Sep. 30, 2014 Impaired Loans [Member] | Dec. 31, 2013 Impaired Loans [Member] | Sep. 30, 2014 Impaired Loans [Member] Level 1 [Member] | Dec. 31, 2013 Impaired Loans [Member] Level 1 [Member] | Sep. 30, 2014 Impaired Loans [Member] Level 2 [Member] | Dec. 31, 2013 Impaired Loans [Member] Level 2 [Member] | Sep. 30, 2014 Impaired Loans [Member] Level 3 [Member] | Dec. 31, 2013 Impaired Loans [Member] Level 3 [Member] | Sep. 30, 2014 Other Real Estate Owned [Member] | Dec. 31, 2013 Other Real Estate Owned [Member] | Sep. 30, 2014 Other Real Estate Owned [Member] Level 1 [Member] | Dec. 31, 2013 Other Real Estate Owned [Member] Level 1 [Member] | Sep. 30, 2014 Other Real Estate Owned [Member] Level 2 [Member] | Dec. 31, 2013 Other Real Estate Owned [Member] Level 2 [Member] | Sep. 30, 2014 Other Real Estate Owned [Member] Level 3 [Member] | Dec. 31, 2013 Other Real Estate Owned [Member] Level 3 [Member] | Sep. 30, 2014 Derivative Liabilities [Member] | Dec. 31, 2013 Derivative Liabilities [Member] | Sep. 30, 2014 Derivative Liabilities [Member] Level 1 [Member] | Dec. 31, 2013 Derivative Liabilities [Member] Level 1 [Member] | Sep. 30, 2014 Derivative Liabilities [Member] Level 2 [Member] | Dec. 31, 2013 Derivative Liabilities [Member] Level 2 [Member] | Sep. 30, 2014 Derivative Liabilities [Member] Level 3 [Member] | Dec. 31, 2013 Derivative Liabilities [Member] Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Assets, Recurring |  |  | $ 41,812 | $ 41,548 | $ 0 | $ 0 | $ 41,812 | $ 41,548 | $ 0 | $ 0 | $ 1,943 | $ 2,365 | $ 0 | $ 0 | $ 1,943 | $ 2,365 | $ 0 | $ 0 | $ 183,297 | $ 278,108 | $ 0 | $ 0 | $ 183,297 | $ 278,108 | $ 0 | $ 0 | $ 1,778 | $ 2,197 | $ 0 | $ 0 | $ 1,778 | $ 2,197 | $ 0 | $ 0 | $ 8,816 | $ 13,156 | $ 0 | $ 0 | $ 7,090 | $ 9,269 | $ 1,726 | $ 3,887 | $ 7,630 | $ 9,128 | $ 0 | $ 0 | $ 7,630 | $ 9,128 | $ 0 | $ 0 | $ 3,697 | $ 4,673 | $ 3,697 | $ 4,673 | $ 0 | $ 0 | $ 0 | $ 0 | $ 1,508 | $ 1,485 | $ 1,508 | $ 1,485 | $ 0 | $ 0 | $ 0 | $ 0 | $ 8,063 | $ 3,538 | $ 0 | $ 0 | $ 8,063 | $ 3,538 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Liabilities, Recurring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,063 | 3,538 | 0 | 0 | 8,063 | 3,538 | 0 | 0
Financial Assets, Nonrecurring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,617 | 11,714 | 0 | 0 | 0 | 0 | 6,617 | 11,714 | 9,161 | 8,470 | 0 | 0 | 0 | 0 | 9,161 | 8,470 |  |  |  |  |  |  |  |
Allowance For Loan Losses On Impaired Loans During The Period | 0 | 750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (142) | (880) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write-downs included in other non-interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (379) | $ (1,108) |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Allowance For Loan Losses On Impaired Loans During The Period + References No definition available. + Details
Name: | chco_AllowanceForLoanLossesOnImpairedLoansDuringPeriod
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Write Downs Included In Other Noninterest Expense + References No definition available. + Details
Name: | chco_WriteDownsIncludedInOtherNoninterestExpense
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity. + References No definition available. + Details
Name: | us-gaap_LiabilitiesFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant