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BORROWED FUNDS - Narrative (Details) - USD ($)
 1 Months Ended 12 Months Ended
Jun. 30, 2022
Sep. 30, 2012
Dec. 31, 2022
Dec. 31, 2021
Borrowings and junior subordinated debentures        
Short-term debt     $ 0 $ 0
Long-term borrowings     125,509,000 110,844,000
Variable-rate FHLB advances     0 0
Federal Reserve Bank Advances        
Borrowings and junior subordinated debentures        
Line of credit facility, remaining borrowing capacity     647,900,000 511,000,000
Advances from the FHLBB        
Borrowings and junior subordinated debentures        
Line of credit     3,000,000  
Long-term line of credit     0 0
Line of credit facility, remaining borrowing capacity     1,500,000,000 1,500,000,000
Short-term debt     0 0
Long-term borrowings     4,445,000 13,331,000
Federal Reserve Bank Advances        
Borrowings and junior subordinated debentures        
Short-term debt     0 0
Federal Home Loan Bank Certificates And Obligations F H L B Callable Advances        
Borrowings and junior subordinated debentures        
Long-term borrowings     0 10,000,000
Federal Home Loan Bank Certificates And Obligations F H L B Amortizing Advances        
Borrowings and junior subordinated debentures        
Long-term borrowings     4,400,000 3,300,000
Subordinated notes        
Borrowings and junior subordinated debentures        
Long-term borrowings     98,089,000 $ 74,590,000
Subordinated notes | Subordinated Debt        
Borrowings and junior subordinated debentures        
Maturity period (in years) 10 years 15 years    
Principal amount of debt issued $ 100,000,000 $ 75,000,000    
Fixed interest rate (as percent) 5.50%      
Maturity period with fixed interest rate (in years) 5 years      
Non callable period (in years) 5 years      
Interest rate margin (as percent) 2.49%      
Subordinated notes | Debt Instrument Variable Rate Three Month SOFR | Subordinated Debt        
Borrowings and junior subordinated debentures        
Unamortized debt issuance expense     $ 1,900,000  
Junior subordinated borrowing | Trust I        
Borrowings and junior subordinated debentures        
Common stock of trust (as percent)     100.00%  
Common stock of trust included in other asset     $ 500,000  
Sole asset of trust in form of debt     $ 15,500,000  
Variable interest rate (as percent)     6.54% 2.01%
Period up to which interest payments can be deferred (in years)     5 years  
Junior subordinated borrowing | Trust II        
Borrowings and junior subordinated debentures        
Common stock of trust (as percent)     100.00%  
Common stock of trust included in other asset     $ 200,000  
Sole asset of trust in form of debt     $ 8,200,000  
Variable interest rate (as percent)     6.47% 1.90%
Period up to which interest payments can be deferred (in years)     5 years  
Junior subordinated borrowing | LIBOR | Trust I        
Borrowings and junior subordinated debentures        
Interest rate margin (as percent)     1.85%  
Junior subordinated borrowing | LIBOR | Trust II        
Borrowings and junior subordinated debentures        
Interest rate margin (as percent)     1.70%