COVER - shares	9 Months Ended
	Sep. 30, 2023	Nov. 01, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	001-35741
Entity Registrant Name	CHEMUNG FINANCIAL CORP
Entity Incorporation, State or Country Code	NY
Entity Tax Identification Number	16-1237038
Entity Address, Address Line One	One Chemung Canal Plaza
Entity Address, City or Town	Elmira
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	14901
City Area Code	607
Local Phone Number	737-3711
Title of 12(b) Security	Common stock, par value $.01 per share
Trading Symbol	CHMG
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		4,722,636
Entity Central Index Key	0000763563
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Amendment Flag	false