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LOAN SALE AND SECURITIZATION ACTIVITIES - Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Sep. 27, 2017
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]      
Minimum net worth $ 2,000    
Actual net worth 751,300    
Tier 1 Leverage Ratio 741,400    
Goodwill 3,297 $ 3,297  
Accumulated other comprehensive income, net of taxes $ 6,571 $ 1,444  
Multifamily Loan Securitization      
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]      
Maximum loss exposure as a percentage of original principal amount 10.00%    
Loans receivable | Multifamily residential | Permanent mortgages      
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]      
Amount of loans sold     $ 626,000