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ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY INFORMATION - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
loan
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest income on impaired loans $ 200 $ 200  
Loan workout and other credit costs 328 1,120  
Troubled debt restructuring related reserves $ 100   $ 200
Usual sustained repayment performance period 6 months    
Residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of loans in the process of foreclosure | loan 22   28
Total loans outstanding $ 2,200   $ 2,500
Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of loans in the process of foreclosure | loan 16   9
Total loans outstanding $ 4,300   $ 3,200
Residential and Consumer Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loan workout and other credit costs $ 300 $ 500  
Impairment loans, charge off period 90 days