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Scheduled Maturities Of Time Deposits (Scheduled Maturities Time Deposits Of $100,000 Or More) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Maturities of Time Deposits [Abstract] |  |
Within one year | $ 34,544 chco_ContractualMaturitiesTimeDepositsExceedingFDICInsuranceLimitsNextTwelveMonths | $ 44,288 chco_ContractualMaturitiesTimeDepositsExceedingFDICInsuranceLimitsNextTwelveMonths
Over one through two years | 16,318 chco_ContractualMaturitiesTimeDepositsExceedingFDICInsuranceLimitsOverOneThroughTwoYears | 9,469 chco_ContractualMaturitiesTimeDepositsExceedingFDICInsuranceLimitsOverOneThroughTwoYears
Over two through three years | 6,014 chco_ContractualMaturitiesTimeDepositsExceedingFDICInsuranceLimitsOverTwoThroughThreeYears | 14,273 chco_ContractualMaturitiesTimeDepositsExceedingFDICInsuranceLimitsOverTwoThroughThreeYears
Over three through four years | 19,808 chco_ContractualMaturitiesTimeDepositsExceedingFDICInsuranceLimitsOverThreeThroughFourYears | 3,353 chco_ContractualMaturitiesTimeDepositsExceedingFDICInsuranceLimitsOverThreeThroughFourYears
Over four through five years | 6,538 chco_ContractualMaturitiesTimeDepositsExceedingFDICInsuranceLimitsOverFourThroughFiveYears | 14,317 chco_ContractualMaturitiesTimeDepositsExceedingFDICInsuranceLimitsOverFourThroughFiveYears
Over five years | 0 chco_ContractualMaturitiesTimeDepositsExceedingFDICInsuranceLimitsOverFiveYears | 0 chco_ContractualMaturitiesTimeDepositsExceedingFDICInsuranceLimitsOverFiveYears
Time Deposits Exceeding FDIC Insurance Limits | $ 83,222 chco_TimeDepositsExceedingFDICInsuranceLimits | $ 85,700 chco_TimeDepositsExceedingFDICInsuranceLimits

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