PENSION PLAN AND OTHER BENEFIT PLANS - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Contribution Profit Sharing, Savings and Investment Plan
Defined Benefit Plan Disclosure [Line Items]
Chemung common stock included in defined contribution plan assets (in shares)	169,398	170,714	178,113
Total expense	$ 639	$ 620	$ 521
Defined Contribution Supplemental Executive Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Balance in the plan	772	550
Total expense	$ 231	$ 213	$ 155