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LOANS - Summary of Commercial Real Estate Investments Held for Investment (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Loans $ 498,081    
Outstanding principal 72,253,465 $ 113,123,301  
Commercial Mortgage      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Loans $ 1,372,430 $ 1,606,091 $ 1,296,803
Percentage of loan portfolio 100.00% 100.00%  
Outstanding principal $ 1,507,244 $ 1,627,109  
Carrying value, unamortized origination fees 4,900 8,300  
Commercial Mortgage | Office      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Loans $ 650,034 $ 681,129  
Percentage of loan portfolio 47.40% 42.40%  
Commercial Mortgage | Retail      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Loans $ 256,493 $ 389,076  
Percentage of loan portfolio 18.70% 24.20%  
Commercial Mortgage | Multifamily      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Loans $ 250,095 $ 262,302  
Percentage of loan portfolio 18.20% 16.30%  
Commercial Mortgage | Hotel      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Loans $ 115,536 $ 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 $ 60,097 $ 82,441  
Percentage of loan portfolio 4.40% 5.10%  
Commercial Mortgage | Other      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Loans $ 20,302 $ 36,589  
Percentage of loan portfolio 1.50% 2.30%  
Commercial Mortgage | Healthcare      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Loans $ 19,873 $ 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]      
Loans $ 373,925 $ 499,690 981,202
Percentage of loan portfolio 25.70% 30.90%  
Outstanding principal $ 387,124 $ 503,499  
Commercial Mortgage | Senior Securitized Mortgages      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Loans $ 874,349 $ 936,378 0
Percentage of loan portfolio 62.30% 57.80%  
Outstanding principal $ 938,859 $ 940,546  
Mezzanine Loans | Commercial Mortgage      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Loans $ 124,156 $ 170,023 $ 315,601
Percentage of loan portfolio 12.00% 11.30%  
Outstanding principal $ 181,261 $ 183,064