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PENSION PLAN AND OTHER BENEFIT PLANS - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2017
Jan. 01, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]          
Number of annual service hours required for eligibility (in hours)     1000 hours    
Defined Contribution Profit Sharing, Savings and Investment Plan          
Defined Benefit Plan Disclosure [Line Items]          
Number of annual service hours required for eligibility (in hours)     1000 hours    
Chemung common stock included in defined contribution plan assets (in shares)     174,957 169,398 170,714
Total expense     $ 609 $ 639 $ 620
Defined Contribution Supplemental Executive Retirement Plan          
Defined Benefit Plan Disclosure [Line Items]          
Balance in the plan     1,043 772  
Total expense     $ 262 $ 231 $ 213
Pension Plan          
Defined Benefit Plan Disclosure [Line Items]          
Total unrecognized net loss increased percentage of obligation amortization threshold     10.00%    
Total unrecognized net loss increased(decreased) percentage of plan assets threshold     10.00%    
Other comprehensive income, defined benefit plans, increase (decrease) in net unamortized gain loss arising during period net of tax     $ 7,100    
Average total life expectancy of participants   28 years 5 months 27 days      
Average future working lifetime of active participants   8 years 9 months 4 days      
Other Postretirement Benefit Plan          
Defined Benefit Plan Disclosure [Line Items]          
Other comprehensive income, defined benefit plans, increase (decrease) in net unamortized gain loss arising during period net of tax     $ 119    
Average future working lifetime of active participants     14 years 3 months 6 days 5 years 6 days  
Executive Supplemental Pension Plan          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, increase(decrease) in total unrecognized net loss     $ 8    
Total unrecognized net loss increased percentage of obligation amortization threshold     10.00%    
Total unrecognized net loss increased(decreased) percentage of plan assets threshold     10.00%    
Scenario, Forecast | Executive Supplemental Pension Plan          
Defined Benefit Plan Disclosure [Line Items]          
Average total life expectancy of participants 15 years 18 days        
Average future working lifetime of active participants 4 years