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GOODWILL (Details) - USD ($)
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Goodwill [Line Items]      
Goodwill $ 69,802,000 $ 69,802,000 $ 69,635,000
Goodwill impairment 0    
Impairment of intangible assets 0    
HarborOne Bank      
Goodwill [Line Items]      
Goodwill 59,000,000.0    
HarborOne Mortgage      
Goodwill [Line Items]      
Goodwill $ 10,800,000