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STOCK COMPENSATION (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Restricted Stock [Member]    
Shares [Roll Forward]    
Nonvested, Beginning Balance (in shares) 26,428us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Granted (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Vested (in shares) (413)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Forfeited or cancelled (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Nonvested, Ending Balance (in shares) 26,015us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Weighted-Average Grant Date Fair Value [Roll Forward]    
Nonvested, Beginning Balance (in dollars per share) $ 27.92us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Granted (in dollars per share) $ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Vested (in dollars per share) $ 26.61us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Forfeitures or Cancelled (in dollars per share) $ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Nonvested (in dollars per share) $ 27.94us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Total unrecognized compensation cost related to nonvested shares granted under the Plan $ 666us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Weighted-average period for recognition 3 years 9 months  
Total fair value of shares vested 11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
President and Chief Executive Officer [Member]    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Service period 12 months  
Directors and President and Chief Executive Officer [Member]    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Number of treasury shares reissued to fund stock compensation (in shares) 9,673us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued
/ us-gaap_TitleOfIndividualAxis
= chmg_DirectorsAndPresidentAndChiefExecutiveOfficerMember
8,385us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued
/ us-gaap_TitleOfIndividualAxis
= chmg_DirectorsAndPresidentAndChiefExecutiveOfficerMember
Expenses related to stock based compensation recognized $ 69us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_TitleOfIndividualAxis
= chmg_DirectorsAndPresidentAndChiefExecutiveOfficerMember
$ 56us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_TitleOfIndividualAxis
= chmg_DirectorsAndPresidentAndChiefExecutiveOfficerMember