XML 107 R1.htm IDEA: XBRL DOCUMENT v3.20.1
Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2019
Mar. 11, 2020
Jun. 30, 2019
Document and Entity Information [Abstract]      
Entity Registrant Name CHEMUNG FINANCIAL CORP    
Entity Central Index Key 0000763563    
Current Fiscal Year End Date --12-31    
Entity Filer Category Accelerated Filer    
Entity Emerging Growth Company false    
Entity Small Business true    
Entity Shell Company false    
Document Type 10-K    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   4,870,366  
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 184,887,776