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Fair Value Measurements (Schedule Of Level 2 Financial Assets And Liabilities Measured On A Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Fair Value Measurement On Nonrecurring Basis Asset And Liabilities Value [Roll Forward]    
Beginning balance $ 6,517chco_FairValueMeasurementOnNonrecurringBasisAssetAndLiabilitiesValue $ 11,714chco_FairValueMeasurementOnNonrecurringBasisAssetAndLiabilitiesValue
Loans classified as impaired during the period 2,859chco_CarryingValueOfImpairedLoansBeforeAllocations 0chco_CarryingValueOfImpairedLoansBeforeAllocations
Specific valuation allowance allocations (1,105)chco_AllowanceForLoanLossesOnImpairedLoansDuringPeriod 0chco_AllowanceForLoanLossesOnImpairedLoansDuringPeriod
Fair Value 1,754chco_AssetsAndLiabilitiesMeasuredOnNonrecurringBasis 0chco_AssetsAndLiabilitiesMeasuredOnNonrecurringBasis
(Additional) reduction in specific valuation allowance allocations 14chco_AdditionalReductionInSpecificValuationAllowanceAllocationsDuringPeriod 369chco_AdditionalReductionInSpecificValuationAllowanceAllocationsDuringPeriod
Paydowns, payoffs, other activity 66chco_AssetsAndLiabilitiesPaydownsPayoffsAndOtherActivity 894chco_AssetsAndLiabilitiesPaydownsPayoffsAndOtherActivity
Ending balance $ 8,219chco_FairValueMeasurementOnNonrecurringBasisAssetAndLiabilitiesValue $ 11,189chco_FairValueMeasurementOnNonrecurringBasisAssetAndLiabilitiesValue