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STOCK COMPENSATION (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Restricted Stock [Member]      
Shares [Roll Forward]      
Nonvested, beginning of period (in shares) 20,639us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
   
Granted (in shares) 11,279us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
   
Vested (in shares) (5,490)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
   
Forfeited or cancelled (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
   
Nonvested, end of period (in shares) 26,428us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
20,639us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Weighted-Average Grant Date Fair Value [Roll Forward]      
Nonvested, beginning of period (in dollars per share) $ 27.17us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
   
Granted (in dollars per share) $ 28.40us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
   
Vested (in dollars per share) $ 26.09us-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, end of period (in dollars per share) $ 27.92us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 27.17us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Total unrecognized compensation cost related to nonvested shares granted under the Plan $ 718us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
   
Weighted-average period for recognition 3 years 11 months 12 days    
Total fair value of shares vested 152us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
181us-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
7,969us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued
/ us-gaap_TitleOfIndividualAxis
= chmg_DirectorsAndPresidentAndChiefExecutiveOfficerMember
Expense related to stock compensation recognized $ 271us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_TitleOfIndividualAxis
= chmg_DirectorsAndPresidentAndChiefExecutiveOfficerMember
$ 273us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_TitleOfIndividualAxis
= chmg_DirectorsAndPresidentAndChiefExecutiveOfficerMember
$ 217us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_TitleOfIndividualAxis
= chmg_DirectorsAndPresidentAndChiefExecutiveOfficerMember