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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Feb. 29, 2016
USD ($)
investment
Dec. 31, 2015
USD ($)
Segment
Mar. 02, 2016
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
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       $ 1,856,000 $ 1,956,000
Number of operating segments | Segment   2      
Subsequent Events          
Deposits   $ 1,400,295   1,280,014  
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      
Facility Closing | Subsequent Event          
Subsequent Events          
Deposits     $ 20,600    
Expected cost     $ 450    
US Treasury Notes Securities | Subsequent Event          
Subsequent Events          
Number of investments sold | investment 2        
Notional value of investment $ 14,500        
Gain on sale of investments $ 908        
Chemung Financial Corporation          
Property, Plant and Equipment [Line Items]          
Assets under management       $ 304,100 $ 287,100