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LOANS - Summary of Commercial Real Estate Investments Held for Investment (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Outstanding Principal $ 72,765,742 $ 113,123,301  
Commercial Mortgage      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Outstanding Principal 1,590,637 1,627,109  
Loans $ 1,456,459 $ 1,606,091 $ 1,296,803
Percentage of Loan Portfolio 100.00% 100.00%  
Carrying value, unamortized origination fees $ 5,900 $ 8,300  
Commercial Mortgage | Office      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Loans $ 666,115 $ 681,129  
Percentage of Loan Portfolio 45.70% 42.40%  
Commercial Mortgage | Retail      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Loans $ 278,714 $ 389,076  
Percentage of Loan Portfolio 19.10% 24.20%  
Commercial Mortgage | Multifamily      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Loans $ 279,430 $ 262,302  
Percentage of Loan Portfolio 19.20% 16.30%  
Commercial Mortgage | Hotel      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Loans $ 121,829 $ 135,681  
Percentage of Loan Portfolio 8.40% 8.40%  
Commercial Mortgage | Industrial      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Loans $ 58,890 $ 82,441  
Percentage of Loan Portfolio 4.00% 5.10%  
Commercial Mortgage | Other      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Loans $ 31,805 $ 36,589  
Percentage of Loan Portfolio 2.20% 2.30%  
Commercial Mortgage | Healthcare      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Loans $ 19,676 $ 18,873  
Percentage of Loan Portfolio 1.40% 1.30%  
Commercial Mortgage | Senior mortgages      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Outstanding Principal $ 469,813 $ 503,499  
Loans $ 450,177 $ 499,690 981,202
Percentage of Loan Portfolio 29.50% 30.90%  
Commercial Mortgage | Senior Securitized Mortgages      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Outstanding Principal $ 939,654 $ 940,546  
Loans $ 882,955 $ 936,378 0
Percentage of Loan Portfolio 59.10% 57.80%  
Commercial Mortgage | Mezzanine loans      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Outstanding Principal $ 181,170 $ 183,064  
Loans $ 123,327 $ 170,023 $ 315,601
Percentage of Loan Portfolio 11.40% 11.30%