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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
segment
Dec. 31, 2015
USD ($)
Property, Plant and Equipment [Line Items]    
Period of delinquency after which a loan is placed on non-accrual status 90 days  
Number of consecutive months for which loans remain current before non-accrual loans are returned to accrual status 6 months  
Rolling historical period of net losses used in evaluating general component of valuation allowance for loans not impaired but classified as substandard and special mention 5 years  
Number of most recent years of actual loss history used in determining historical loss experience for all other unclassified loans 2 years  
Assets under management $ 1,721,000 $ 1,856,000
Cash or securities pledged as collateral $ 191,000 196,100
Number of operating segments | segment 2  
Buildings | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 15 years  
Buildings | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 50 years  
Equipment and Furniture | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 3 years  
Equipment and Furniture | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 10 years  
Chemung Financial Corporation    
Property, Plant and Equipment [Line Items]    
Assets under management $ 299,000 $ 304,100
Derivative    
Property, Plant and Equipment [Line Items]    
Cash or securities pledged as collateral $ 450