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FAIR VALUES, Quantitative Information (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Impaired loan valuation allowance $ 1,235us-gaap_ImpairedFinancingReceivableRelatedAllowance $ 1,046us-gaap_ImpairedFinancingReceivableRelatedAllowance  
Provision for loan losses 3,981us-gaap_ProvisionForLoanAndLeaseLosses 2,755us-gaap_ProvisionForLoanAndLeaseLosses 828us-gaap_ProvisionForLoanAndLeaseLosses
Write down of OREO 4,278us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs 1,493us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs 1,273us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Impaired Loans [Member]      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Principal balance of impaired loans 4,900us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_FairValueByAssetClassAxis
= chmg_ImpairedLoansMember
2,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_FairValueByAssetClassAxis
= chmg_ImpairedLoansMember
 
Impaired loan valuation allowance 1,200us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FairValueByAssetClassAxis
= chmg_ImpairedLoansMember
1,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FairValueByAssetClassAxis
= chmg_ImpairedLoansMember
 
Provision for loan losses 232us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FairValueByAssetClassAxis
= chmg_ImpairedLoansMember
853us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FairValueByAssetClassAxis
= chmg_ImpairedLoansMember
 
OREO [Member]      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Net carrying amount of OREO 3,100chmg_OtherRealEstateOwnedCarryingValueNet
/ us-gaap_FairValueByAssetClassAxis
= chmg_OtherRealEstateOwnedMember
538chmg_OtherRealEstateOwnedCarryingValueNet
/ us-gaap_FairValueByAssetClassAxis
= chmg_OtherRealEstateOwnedMember
 
Outstanding balance of OREO 3,100us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_FairValueByAssetClassAxis
= chmg_OtherRealEstateOwnedMember
732us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_FairValueByAssetClassAxis
= chmg_OtherRealEstateOwnedMember
 
Other real estate owned valuation allowance 2us-gaap_RealEstateOwnedValuationAllowanceComponent
/ us-gaap_FairValueByAssetClassAxis
= chmg_OtherRealEstateOwnedMember
194us-gaap_RealEstateOwnedValuationAllowanceComponent
/ us-gaap_FairValueByAssetClassAxis
= chmg_OtherRealEstateOwnedMember
 
Write down of OREO   2us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_FairValueByAssetClassAxis
= chmg_OtherRealEstateOwnedMember
 
Non-recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Third Party Real Estate and a 100% Discount of Personal Property [Member] | Impaired Loans [Member]      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Fair value 3,645us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= chmg_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_ValuationTechniqueAxis
= chmg_ThirdPartyRealEstateAndA100DiscountOfPersonalPropertyMember
999us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= chmg_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_ValuationTechniqueAxis
= chmg_ThirdPartyRealEstateAndA100DiscountOfPersonalPropertyMember
 
Unobservable input 1 Management discount based on underlying collateral characteristics and market conditions Management discount based on underlying collateral characteristics and market conditions  
Non-recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Third Party Appraisals [Member] | OREO [Member]      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Fair value $ 3,065us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= chmg_OtherRealEstateOwnedMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember
$ 538us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= chmg_OtherRealEstateOwnedMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember
 
Unobservable input 1 Estimated holding period Estimated holding period  
Unobservable input 2 Estimated closing costs Estimated closing costs