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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 ($)
Jun. 30, 2022
USD ($)
borrower
Jun. 30, 2021
USD ($)
borrower
Jun. 30, 2022
USD ($)
contract
borrower
Jun. 30, 2021
USD ($)
borrower
contract
Dec. 31, 2021
USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Financing receivable, loan forebearances, loan balance $ 242,500,000          
Financing receivable, troubled debt restructuring   $ 6,200,000   $ 6,200,000   $ 10,300,000
Financing receivable, troubled debt restructuring, purchased with credit deterioration, increase   300,000   300,000   1,900,000
Financing receivable, modifications, recorded investment, still accruing   1,700,000   1,700,000   5,600,000
Financing receivable, modifications, recorded investment, nonaccrual status   4,500,000   4,500,000   4,700,000
Additional amounts committed to customers with loans classified as troubled debt restructurings   0   0   $ 0
Number of Loans | borrower     2   4  
Increase in allowance for loan losses related to troubled debt restructurings     $ 1,700,000   $ 1,700,000  
Charge offs   831,000 227,000 $ 1,029,000 $ 416,000  
Number of days past due after which a loan is considered to be in payment default       90 days    
Financing receivable, troubled debt restructuring, subsequent default, number of contracts | contract       0 0  
Commercial Mortgages            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Charge offs   $ 687,000 $ 0 $ 687,000 $ 0  
Commercial Mortgages | Commercial mortgages, other            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Number of Loans | borrower   0 2 0 4  
Charge offs     $ 0   $ 0  
Financing Receivable | Chemung | Customer Concentration Risk            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Concentration risk percentage (in percentage) 15.77%