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LOANS AND ALLOWANCE FOR LOAN LOSSES - Troubled Debt Restructuring Narrative (Details)
3 Months Ended 9 Months Ended
May 31, 2020
USD ($)
Sep. 30, 2021
USD ($)
borrower
contract
loan
Sep. 30, 2020
loan
contract
borrower
Sep. 30, 2021
USD ($)
borrower
loan
contract
Sep. 30, 2020
borrower
contract
Dec. 31, 2020
USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Loan forebearances, loan balance | $ $ 242,500,000          
Financing receivable, troubled debt restructuring | $   $ 10,800,000   $ 10,800,000   $ 6,700,000
Financing receivable, troubled debt restructuring, purchased with credit deterioration, increase | $   2,200,000   2,200,000   400,000
Financing receivable, modifications, recorded investment, still accruing | $   5,700,000   5,700,000   2,800,000
Financing receivable, modifications, recorded investment, nonaccrual status | $   5,100,000   5,100,000   3,900,000
Additional amounts committed to customers with loans classified as troubled debt restructurings | $   $ 0   $ 0   $ 0
Number of loans   2 3 6 15  
Financing receivable, troubled debt restructuring, subsequent default, number of contracts | contract   0 0 0 0  
Payment deferral            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Financing receivable, modifications, number of days past due     30 days      
Commercial and industrial | Extended maturity            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of loans     2      
Commercial and industrial | Interest rate below market reduction            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of loans     1      
Residential mortgages            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of loans     1      
Commercial mortgages | Payment deferral            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of loans     4      
Financing receivable, modifications, number of borrowers | borrower     3      
Residential mortgages | Payment deferral            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of loans     3      
Residential mortgages | Non-accrual Status | Payment deferral            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of loans     3      
Home equity lines and loans | Payment deferral            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of loans     3      
Non-accrual Status | Commercial and industrial | Interest rate below market reduction            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of loans | borrower     1      
Substandard | Commercial and industrial | Interest rate below market reduction            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of loans     2      
Substandard | Commercial mortgages | Non-accrual Status | Payment deferral            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of loans     3      
Substandard | Commercial mortgages | Non-accrual Status | Payment deferral | 30 - 59 Days Past Due            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of loans     2      
Substandard | Residential mortgages | Non-accrual Status | Payment deferral            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of loans     2      
Substandard | Residential mortgages | Non-accrual Status | Payment deferral | 30 - 59 Days Past Due            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of loans     1      
Substandard | Home equity lines and loans | Non-accrual Status | Payment deferral            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of loans     3      
Commercial and consumer portfolio segment            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of loans remaining in modified status | borrower   11   11    
Loan balance remaining in modified status | $   $ 3,000,000   $ 3,000,000    
Number of loans remaining in modified status, modified more than once | borrower   5   5    
Loan balance remaining in modified status, modified more than once | $   $ 2,900,000   $ 2,900,000    
Commercial and agricultural: | Commercial and industrial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of loans   2   2    
Commercial and agricultural: | Commercial mortgages            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of loans | borrower       2    
Financing Receivable | Chemung | Customer Concentration Risk            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Concentration risk percentage (in percentage) 15.77%     0.20%