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BORROWED FUNDS - Narrative (Details) - USD ($)
 1 Months Ended 3 Months Ended
Jun. 30, 2022
Mar. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]      
Line of credit, current   $ 3,000,000  
Short-term debt   900,000,000 $ 0
Long-term borrowings   125,571,000 125,509,000
Variable-rate FHLB advances   0 0
Federal Reserve Bank Advances      
Debt Instrument [Line Items]      
Line of credit facility, remaining borrowing capacity   1,400,000,000 600,000,000
Short-term debt   0 0
Advances from the FHLB      
Debt Instrument [Line Items]      
Long-term line of credit   0 0
Line of credit facility, remaining borrowing capacity   1,700,000,000 1,500,000,000
Short-term debt   900,000,000 0
Long-term borrowings   4,395,000 4,445,000
Federal Home Loan Bank Certificates And Obligations F H L B Callable Advances      
Debt Instrument [Line Items]      
Long-term borrowings   0  
Federal Home Loan Bank Certificates And Obligations F H L B Amortizing Advances      
Debt Instrument [Line Items]      
Long-term borrowings   4,400,000 4,400,000
Subordinated borrowings      
Debt Instrument [Line Items]      
Long-term borrowings   98,188,000 $ 98,089,000
Subordinated borrowings | Subordinated Debt      
Debt Instrument [Line Items]      
Maturity period 10 years    
Principal amount of debt issued $ 100,000,000    
Fixed interest rate 5.50%    
Maturity period with fixed interest rate 5 years    
Non callable period 5 years    
Interest rate margin 2.49%    
Subordinated borrowings | Debt Instrument Variable Rate Three Month SOFR | Subordinated Debt      
Debt Instrument [Line Items]      
Unamortized debt issuance expense   $ 1,400,000  
Junior subordinated borrowing | Trust I      
Debt Instrument [Line Items]      
Common stock of trust   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   6.77% 6.54%
Period up to which interest payments can be deferred   5 years  
Junior subordinated borrowing | Trust II      
Debt Instrument [Line Items]      
Common stock of trust   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   6.57% 6.47%
Period up to which interest payments can be deferred   5 years  
Junior subordinated borrowing | LIBOR | Trust I      
Debt Instrument [Line Items]      
Interest rate margin   1.85%  
Junior subordinated borrowing | LIBOR | Trust II      
Debt Instrument [Line Items]      
Interest rate margin   1.70%