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INCOME TAXES (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current [Abstract]      
State $ 606,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit $ 395,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit $ 530,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Federal 5,366,000us-gaap_CurrentFederalTaxExpenseBenefit 3,548,000us-gaap_CurrentFederalTaxExpenseBenefit 4,208,000us-gaap_CurrentFederalTaxExpenseBenefit
Current income tax expense (benefit), Total 5,972,000us-gaap_CurrentIncomeTaxExpenseBenefit 3,943,000us-gaap_CurrentIncomeTaxExpenseBenefit 4,738,000us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred expense/(benefit) (2,263,000)us-gaap_DeferredIncomeTaxExpenseBenefit (121,000)us-gaap_DeferredIncomeTaxExpenseBenefit 647,000us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense 3,709,000us-gaap_IncomeTaxExpenseBenefit 3,822,000us-gaap_IncomeTaxExpenseBenefit 5,385,000us-gaap_IncomeTaxExpenseBenefit
Reconciliation of income tax expense [Abstract]      
Tax computed at statutory rate 4,034,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 4,268,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 5,578,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Tax-exempt interest (456,000)us-gaap_IncomeTaxReconciliationTaxExemptIncome (483,000)us-gaap_IncomeTaxReconciliationTaxExemptIncome (506,000)us-gaap_IncomeTaxReconciliationTaxExemptIncome
Dividend exclusion (60,000)us-gaap_IncomeTaxReconciliationDeductionsDividends (46,000)us-gaap_IncomeTaxReconciliationDeductionsDividends (40,000)us-gaap_IncomeTaxReconciliationDeductionsDividends
State taxes, net of Federal impact 227,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 188,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 439,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Nondeductible interest expense 8,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther 11,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther 16,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Other items, net (44,000)us-gaap_IncomeTaxReconciliationOtherAdjustments (116,000)us-gaap_IncomeTaxReconciliationOtherAdjustments (102,000)us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax expense 3,709,000us-gaap_IncomeTaxExpenseBenefit 3,822,000us-gaap_IncomeTaxExpenseBenefit 5,385,000us-gaap_IncomeTaxExpenseBenefit
Deferred tax assets [Abstract]      
Allowance for loan losses 5,182,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses 4,889,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses  
Accrual for employee benefit plans 709,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits 754,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits  
Depreciation 1,010,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 431,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment  
Deferred compensation and directors' fees 1,076,000chmg_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsDirectorsCompensation 947,000chmg_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsDirectorsCompensation  
Purchase accounting adjustment - deposits 65,000chmg_DeferredTaxAssetPurchaseAccountingAdjustmentDeposits 137,000chmg_DeferredTaxAssetPurchaseAccountingAdjustmentDeposits  
Purchase accounting adjustment - loans 259,000chmg_DeferredTaxAssetsPurchaseAccountingAdjustmentLoans 340,000chmg_DeferredTaxAssetsPurchaseAccountingAdjustmentLoans  
Purchase accounting adjustment - fixed assets 221,000chmg_DeferredTaxAssetsPurchaseAccountingAdjustmentFixedAssets 224,000chmg_DeferredTaxAssetsPurchaseAccountingAdjustmentFixedAssets  
Accounting for defined benefit pension and other benefit plans 6,624,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther 3,691,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther  
Trust preferred impairment write-down 540,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses 742,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses  
Nonaccrued interest 617,000chmg_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsNonaccruedInterest 626,000chmg_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsNonaccruedInterest  
Accrued expense 1,580,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 0us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities  
Other 456,000us-gaap_DeferredTaxAssetsOther 647,000us-gaap_DeferredTaxAssetsOther  
Total gross deferred tax assets 18,339,000us-gaap_DeferredTaxAssetsGross 13,428,000us-gaap_DeferredTaxAssetsGross  
Deferred tax liabilities [Abstract]      
Deferred loan fees and costs 910,000us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts 929,000us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts  
Prepaid pension 5,179,000us-gaap_DeferredTaxLiabilitiesPrepaidExpenses 5,435,000us-gaap_DeferredTaxLiabilitiesPrepaidExpenses  
Net unrealized gains on securities available for sale 1,359,000chmg_DeferredTaxLiabilitiesNetUnrealizedGainsOnSecuritiesAvailableForSale 3,929,000chmg_DeferredTaxLiabilitiesNetUnrealizedGainsOnSecuritiesAvailableForSale  
Discount accretion 410,000chmg_DeferredTaxLiabilitiesDeferredExpenseDiscountAccretion 352,000chmg_DeferredTaxLiabilitiesDeferredExpenseDiscountAccretion  
Core deposit intangible 1,479,000us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 1,556,000us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets  
Other 153,000us-gaap_DeferredTaxLiabilitiesOther 144,000us-gaap_DeferredTaxLiabilitiesOther  
Total gross deferred tax liabilities 9,490,000us-gaap_DeferredIncomeTaxLiabilities 12,345,000us-gaap_DeferredIncomeTaxLiabilities  
Net deferred tax asset 8,849,000us-gaap_DeferredTaxAssetsLiabilitiesNet 1,083,000us-gaap_DeferredTaxAssetsLiabilitiesNet  
Unrecognized tax benefits 0us-gaap_UnrecognizedTaxBenefits 0us-gaap_UnrecognizedTaxBenefits 0us-gaap_UnrecognizedTaxBenefits
Accrued interest or penalties related to uncertain tax positions $ 0us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued $ 0us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued $ 0us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued