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OTHER COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ACTIVITIES - Schedule of Financial Instruments Outstanding Whose Contract Amounts Represent Credit Risk (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Financial commitments whose contractual amount represents credit risk    
Total $ 2,237,512 $ 2,324,399
Commitments to originate new loans    
Financial commitments whose contractual amount represents credit risk    
Total 256,877 305,474
Unused funds on commercial and other lines of credit    
Financial commitments whose contractual amount represents credit risk    
Total 1,146,415 966,523
Unadvanced funds on home equity lines of credit    
Financial commitments whose contractual amount represents credit risk    
Total 347,543 336,924
Unadvanced funds on construction and real estate loans    
Financial commitments whose contractual amount represents credit risk    
Total 467,702 694,091
Standby letters of credit    
Financial commitments whose contractual amount represents credit risk    
Total $ 18,975 $ 21,387