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LEASES Textual (Details)
 12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Lessee, Lease, Description [Line Items]      
Operating Lease, Weighted Average Remaining Lease Term 5 years 5 months 15 days 5 years 8 months 19 days 5 years 7 months 2 days
Operating Lease, Weighted Average Discount Rate, Percent 2.43% 1.97% 2.13%
Operating Lease, Right-of-Use Asset $ 58,900,000 $ 60,200,000  
Operating Lease, Impairment Loss $ 0 0 $ 4,163,000
Property Subject to or Available for Operating Lease, Number of Units 117    
Operating Lease, Impairment Loss $ 0 0 $ 4,163,000
Operating lease, Termination costs $ 4,400,000    
Blue Hills Bancorp, Inc. [Member]      
Lessee, Lease, Description [Line Items]      
Business Acquisition, Operating Lease Impairment Charge   2,300,000  
Business Acquisition, Operating Lease Impairment Charge   $ 2,300,000  
Maximum [Member]      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Renewal Term 20 years    
Minimum [Member]      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Renewal Term 1 year