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LOANS - Summary of Commercial Real Estate Investments Held for Investment (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Outstanding Principal $ 69,291,915 $ 72,253,465  
Commercial Mortgage      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Outstanding Principal 1,510,815 1,507,244  
Carrying Value $ 1,384,122 $ 1,372,430 $ 1,618,794
Percentage of Loan Portfolio 100.00% 100.00%  
Carrying value, unamortized origination fees $ 5,400 $ 4,900  
Commercial Mortgage | Office      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Carrying Value $ 577,893 $ 650,034  
Percentage of Loan Portfolio 41.80% 47.40%  
Commercial Mortgage | Retail      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Carrying Value $ 249,917 $ 256,493  
Percentage of Loan Portfolio 18.10% 18.70%  
Commercial Mortgage | Multifamily      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Carrying Value $ 217,131 $ 250,095  
Percentage of Loan Portfolio 15.70% 18.20%  
Commercial Mortgage | Hotel      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Carrying Value $ 130,578 $ 115,536  
Percentage of Loan Portfolio 9.40% 8.40%  
Commercial Mortgage | Industrial      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Carrying Value $ 114,152 $ 60,097  
Percentage of Loan Portfolio 8.20% 4.40%  
Commercial Mortgage | Other      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Carrying Value $ 75,306 $ 20,302  
Percentage of Loan Portfolio 5.40% 1.50%  
Commercial Mortgage | Healthcare      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Carrying Value $ 19,145 $ 19,873  
Percentage of Loan Portfolio 1.40% 1.40%  
Commercial Mortgage | Mezzanine loans      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Outstanding Principal $ 171,639 $ 181,261  
Carrying Value $ 112,960 $ 124,156 182,726
Percentage of Loan Portfolio 11.40% 12.00%  
Commercial Mortgage | Senior mortgages      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Outstanding Principal $ 432,736 $ 387,124  
Carrying Value $ 409,166 $ 373,925 499,690
Percentage of Loan Portfolio 28.60% 25.70%  
Commercial Mortgage | Senior Securitized Mortgages      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Outstanding Principal $ 906,440 $ 938,859  
Carrying Value $ 861,996 $ 874,349 $ 936,378
Percentage of Loan Portfolio 60.00% 62.30%