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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loans, Premises and Equipment and Wealth Management and Group Fee Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]    
Period of delinquency after which a loan is placed on non-accrual status (days) 90 days  
Assets under management $ 2,242.0 $ 2,053.0
Chemung Financial Corporation    
Property, Plant and Equipment [Line Items]    
Assets under management $ 381.3 $ 346.5
Buildings | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives (years) 15 years  
Buildings | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives (years) 50 years  
Equipment and Furniture | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives (years) 3 years  
Equipment and Furniture | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives (years) 10 years