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LOANS AND ALLOWANCE FOR LOAN LOSSES - Troubled Debt Restructuring Narrative (Details)
3 Months Ended 6 Months Ended
May 31, 2020
USD ($)
Jun. 30, 2021
USD ($)
loan
borrower
contract
Jun. 30, 2020
USD ($)
loan
borrower
contract
Jun. 30, 2021
USD ($)
contract
borrower
loan
Jun. 30, 2020
USD ($)
borrower
loan
contract
Dec. 31, 2020
USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Loan forebearances, loan balance | $ $ 242,500,000          
Financing receivable, troubled debt restructuring | $   $ 11,600,000   $ 11,600,000   $ 6,700,000
Financing receivable, troubled debt restructuring, purchased with credit deterioration, increase | $   2,100,000   2,100,000   400,000
Financing receivable, modifications, recorded investment, still accruing | $   6,300,000   6,300,000   2,800,000
Additional amounts committed to customers with loans classified as troubled debt restructurings | $   $ 0   $ 0   0
Number of loans   2 12 4 12  
Allowance for loan and lease losses, period increase (decrease) | $   $ 1,700,000 $ 200,000 $ 1,700,000 $ 200,000  
Financing receivables, impaired, troubled debt restructuring, write-down | $     $ 0 $ 0 $ 0  
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            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of loans | borrower     2   2  
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 | Payment deferral | Non-accrual Status            
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            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Financing receivable, modifications, recorded investment, nonaccrual status | $   $ 5,300,000   $ 5,300,000   $ 3,900,000
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 | Payment deferral | Non-accrual Status            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of loans     3      
Substandard | Commercial mortgages | Payment deferral | Non-accrual Status | 30 - 59 Days Past Due            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of loans     2      
Substandard | Residential mortgages | Payment deferral | Non-accrual Status            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of loans     2      
Substandard | Residential mortgages | Payment deferral | Non-accrual Status | 30 - 59 Days Past Due            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of loans     1      
Substandard | Home equity lines and loans | Payment deferral | Non-accrual Status            
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   24   24    
Loan balance remaining in modified status | $   $ 20,500,000   $ 20,500,000    
Number of loans remaining in modified status, modified more than once | borrower   13   13    
Loan balance remaining in modified status, modified more than once | $   $ 16,600,000   $ 16,600,000    
Commercial and Agricultural | Commercial and industrial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of loans   2     0  
Financing Receivable | Customer Concentration Risk | Chemung            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Concentration risk percentage (in percentage) 15.77%     1.32%