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OTHER COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ACTIVITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Loss Contingencies [Line Items]    
Total $ 801,984 $ 919,905
Commitments to originate new loans    
Loss Contingencies [Line Items]    
Total 55,163 51,371
Unused funds on commercial and other lines of credit    
Loss Contingencies [Line Items]    
Total 202,516 265,587
Unadvanced funds on home equity lines of credit    
Loss Contingencies [Line Items]    
Total 118,794 122,295
Unadvanced funds on construction and real estate loans    
Loss Contingencies [Line Items]    
Total 188,794 247,382
Commercial and standby letters of credit    
Loss Contingencies [Line Items]    
Total 4,217 4,370
Letters of credit securing municipal deposits    
Loss Contingencies [Line Items]    
Total $ 232,500 $ 228,900