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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 |

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