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OTHER COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Commitments to grant residential real estate loans - HarborOne Mortgage    
OTHER COMMITMENTS AND CONTINGENCIES    
Financial instruments committed contract amount $ 50,920 $ 38,929
Commitments to grant other loans    
OTHER COMMITMENTS AND CONTINGENCIES    
Financial instruments committed contract amount 48,522 25,191
Unadvanced funds on home equity lines of credit    
OTHER COMMITMENTS AND CONTINGENCIES    
Financial instruments committed contract amount 285,840 281,890
Unadvanced funds on revolving lines of credit    
OTHER COMMITMENTS AND CONTINGENCIES    
Financial instruments committed contract amount 242,041 270,735
Unadvanced funds on construction loans    
OTHER COMMITMENTS AND CONTINGENCIES    
Financial instruments committed contract amount $ 142,615 $ 166,726