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LOANS AND ALLOWANCE FOR LOAN LOSSES - Troubled Debt Restructuring Narrative (Details)
3 Months Ended
May 31, 2020
USD ($)
Mar. 31, 2022
USD ($)
contract
Mar. 31, 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   $ 9,200,000   $ 10,300,000
Financing receivable, troubled debt restructuring, purchased with credit deterioration, increase   1,800,000   1,900,000
Financing receivable, modifications, recorded investment, still accruing   4,700,000   5,600,000
Financing receivable, modifications, recorded investment, nonaccrual status   4,500,000   4,700,000
Additional amounts committed to customers with loans classified as troubled debt restructurings   $ 0   $ 0
Number of Loans | borrower     2  
Increase in allowance for loan losses related to troubled debt restructurings     $ 0  
Charge offs     $ 0  
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 | Commercial mortgages, other        
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%