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  <xs:element id="chmg_PioneerBankLitigationMember" abstract="true" name="PioneerBankLitigationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="chmg_DistributionOfTreasuryStockGrantsForEmployeeRestrictedStockAwards" abstract="false" name="DistributionOfTreasuryStockGrantsForEmployeeRestrictedStockAwards" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="chmg_LoanServicingFeesMember" abstract="true" name="LoanServicingFeesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="chmg_ProductsAndServicesOtherMember" abstract="true" name="ProductsAndServicesOtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="chmg_FederalHomeLoanBankAndFederalReserveBankStockAtCost" abstract="false" name="FederalHomeLoanBankAndFederalReserveBankStockAtCost" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="chmg_FinancingReceivablePayrollProtectionProgramLoansCARESAct" abstract="false" name="FinancingReceivablePayrollProtectionProgramLoansCARESAct" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="chmg_IndirectConsumerLoansMember" abstract="true" name="IndirectConsumerLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="chmg_DistributionOfSharesOfTreasuryStockForDeferredDirectorsCompensationValue" abstract="false" name="DistributionOfSharesOfTreasuryStockForDeferredDirectorsCompensationValue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="chmg_DistributionOfSharesOfTreasuryStockForDirectorsCompensationShares" abstract="false" name="DistributionOfSharesOfTreasuryStockForDirectorsCompensationShares" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="chmg_OverdraftFeesMember" abstract="true" name="OverdraftFeesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="chmg_CashPaidDuringYearForAbstract" abstract="true" name="CashPaidDuringYearForAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="chmg_ServiceChargeonDepositsOtherMember" abstract="true" name="ServiceChargeonDepositsOtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="chmg_SbaLoansMember" abstract="true" name="SbaLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="chmg_OperatingLeaseRightOfUseAssetLeaseTermination" abstract="false" name="OperatingLeaseRightOfUseAssetLeaseTermination" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="chmg_SmallBusinessAdministrationPoolLoansFairValueDisclosure" abstract="false" name="SmallBusinessAdministrationPoolLoansFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="chmg_CommercialMortgagesOtherLoansMember" abstract="true" name="CommercialMortgagesOtherLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="chmg_ExpenseRelatedToEmployeeStockAwards" abstract="false" name="ExpenseRelatedToEmployeeStockAwards" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="chmg_ObligationsOfStatesAndPoliticalSubdivisionsFairValueDisclosure" abstract="false" name="ObligationsOfStatesAndPoliticalSubdivisionsFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="chmg_HoldingCompanyCFSAndCRMMember" abstract="true" name="HoldingCompanyCFSAndCRMMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="chmg_A2021PlanMember" abstract="true" name="A2021PlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="chmg_FinancingReceivableAndAllowanceForCreditLossesEvaluatedForImpairmentTableTextBlock" abstract="false" name="FinancingReceivableAndAllowanceForCreditLossesEvaluatedForImpairmentTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="chmg_FinancingReceivableAllowanceForLoanLossesInPayrollProtectionProgramLoans" abstract="false" name="FinancingReceivableAllowanceForLoanLossesInPayrollProtectionProgramLoans" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="chmg_RestrictedStockExpenseDirectorsDeferredCompensationPlan" abstract="false" name="RestrictedStockExpenseDirectorsDeferredCompensationPlan" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="chmg_BranchLocation2RushStreetSchenectadyNewYorkMember" abstract="true" name="BranchLocation2RushStreetSchenectadyNewYorkMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="chmg_ImpairmentEvaluationAxis" abstract="true" name="ImpairmentEvaluationAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="chmg_OtherRealEstateOwnedExpense" abstract="false" name="OtherRealEstateOwnedExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="chmg_RestrictedStockUnitsForDirectorsDeferredCompensationPlan" abstract="false" name="RestrictedStockUnitsForDirectorsDeferredCompensationPlan" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="chmg_WealthManagementGroupServicesSegmentMember" abstract="true" name="WealthManagementGroupServicesSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="chmg_IndividuallyEvaluatedMember" abstract="true" name="IndividuallyEvaluatedMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="chmg_DistributionOfSharesOfTreasuryStockForDirectorsDeferredCompensationValue" abstract="false" name="DistributionOfSharesOfTreasuryStockForDirectorsDeferredCompensationValue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="chmg_NotRatedMember" abstract="true" name="NotRatedMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="chmg_COVID19Member" abstract="true" name="COVID19Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="chmg_PensionAndOtherEmployeeBenefits" abstract="false" name="PensionAndOtherEmployeeBenefits" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="chmg_BranchLocation1365NewScotlandRoadSlingerlandsNewYorkMember" abstract="true" name="BranchLocation1365NewScotlandRoadSlingerlandsNewYorkMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="chmg_NumberOfDaysPastDueAfterWhichALoanWillBeRated" abstract="false" name="NumberOfDaysPastDueAfterWhichALoanWillBeRated" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="chmg_NetGainsOnSalesOfSecuritiesMember" abstract="true" name="NetGainsOnSalesOfSecuritiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="chmg_DistributionOfSharesOfTreasuryStockForEmployeeRestrictedStockAwardsShares" abstract="false" name="DistributionOfSharesOfTreasuryStockForEmployeeRestrictedStockAwardsShares" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="chmg_TradingDaysPeriod" abstract="false" name="TradingDaysPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="chmg_SalesComparisonMember" abstract="true" name="SalesComparisonMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="chmg_NoncashDistributionOfTreasuryStockForDirectorsCompensation" abstract="false" name="NoncashDistributionOfTreasuryStockForDirectorsCompensation" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="chmg_TreasuryStockIssuedDuringPeriodValueRestrictedStockAwardForfeitures" abstract="false" name="TreasuryStockIssuedDuringPeriodValueRestrictedStockAwardForfeitures" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="chmg_PaymentsOnOperatingLeasesOperatingActivities" abstract="false" name="PaymentsOnOperatingLeasesOperatingActivities" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="chmg_ProceedsFromLoanOriginationsAndHeldForSAle" abstract="false" name="ProceedsFromLoanOriginationsAndHeldForSAle" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="chmg_ResidentialAndConsumerReceivableCreditQualityIndicatorsTableTextBlock" abstract="false" name="ResidentialAndConsumerReceivableCreditQualityIndicatorsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="chmg_CommercialAndAgriculturalPortfolioSegmentMember" abstract="true" name="CommercialAndAgriculturalPortfolioSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="chmg_AssetsAndLiabilitiesLesseeTableTextBlock" abstract="false" name="AssetsAndLiabilitiesLesseeTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="chmg_InvestmentBrokerageMember" abstract="true" name="InvestmentBrokerageMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
