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COVER - USD ($)
 12 Months Ended
Dec. 31, 2023
Mar. 01, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
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 $0.01 Per Share    
Trading Symbol CHMG    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 145,072,803
Entity Common Stock, Shares Outstanding   4,750,674  
Documents Incorporated by Reference
Portions of the Proxy Statement for the Annual Meeting of Shareholders to be held on June 4, 2024 are incorporated by reference into Part III, Items 10, 11, 12, 13, and 14 of this Form 10-K.
    
Entity Central Index Key 0000763563    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false