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LOANS - Schedule of Commercial Real Estate Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 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 $ 68,367,873 $ 72,253,465  
Commercial Mortgage      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Outstanding Principal 1,468,278 1,507,244  
Carrying Value $ 1,341,699 $ 1,372,430 $ 1,618,794
Percentage of Loan Portfolio 100.00% 100.00%  
Carrying value, unamortized origination fees $ 5,300 $ 4,900  
Commercial Mortgage | Mezzanine loans      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Outstanding Principal 171,979 181,261  
Carrying Value $ 113,300 $ 124,156 182,726
Percentage of Loan Portfolio 11.70% 12.00%  
Commercial Mortgage | Senior mortgages      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Outstanding Principal $ 388,293 $ 387,124  
Carrying Value $ 364,974 $ 373,925 499,690
Percentage of Loan Portfolio 26.40% 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 $ 908,006 $ 938,859  
Carrying Value $ 863,425 $ 874,349 $ 936,378
Percentage of Loan Portfolio 61.90% 62.30%