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LOANS - Summary of Commercial Real Estate Investments Held for Investment (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Outstanding principal $ 113,123,301 $ 96,602,237  
Loans 669,713    
Carrying value, unamortized origination fees 8,300 7,600  
Commercial Mortgage      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Outstanding principal 1,627,109 1,307,911  
Loans $ 1,606,091 $ 1,296,803 $ 1,029,327
Percentage of loan portfolio 100.00% 100.00%  
Commercial Mortgage | Senior Mortgages      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Outstanding principal $ 503,499 $ 988,248  
Loans $ 499,690 $ 981,202 625,900
Percentage of loan portfolio 30.90% 75.60%  
Commercial Mortgage | Senior Securitized Mortgages      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Outstanding principal $ 940,546 $ 0  
Loans $ 936,378 $ 0  
Percentage of loan portfolio 57.80% 0.00%  
Commercial Mortgage | Preferred Equity      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Loans   $ 0 8,985
Mezzanine Loans | Commercial Mortgage      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Outstanding principal $ 183,064 319,663  
Loans $ 170,023 $ 315,601 $ 394,442
Percentage of loan portfolio 11.30% 24.40%