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LOANS - Summary of Commercial Real Estate Investments Held for Investment (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Outstanding Principal | $ 77,593,064 | $ 113,123,301 |
Commercial Mortgage |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Outstanding Principal | 1,660,063 | 1,627,109 |
Loans | $ 1,563,134 | $ 1,606,091 | $ 1,296,803
Percentage of Loan Portfolio | 100.00% | 100.00% |
Carrying value, unamortized origination fees | $ 8,200 | $ 8,300 |
Commercial Mortgage | Office |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Loans | $ 673,947 | $ 681,129 |
Percentage of Loan Portfolio | 43.10% | 42.40% |
Commercial Mortgage | Retail |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Loans | $ 348,045 | $ 389,076 |
Percentage of Loan Portfolio | 22.30% | 24.20% |
Commercial Mortgage | Multifamily |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Loans | $ 283,698 | $ 262,302 |
Percentage of Loan Portfolio | 18.10% | 16.30% |
Commercial Mortgage | Hotel |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Loans | $ 125,870 | $ 135,681 |
Percentage of Loan Portfolio | 8.10% | 8.40% |
Commercial Mortgage | Industrial |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Loans | $ 79,882 | $ 82,441 |
Percentage of Loan Portfolio | 5.10% | 5.10% |
Commercial Mortgage | Other |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Loans | $ 32,534 | $ 36,589 |
Percentage of Loan Portfolio | 2.10% | 2.30% |
Commercial Mortgage | Healthcare |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Loans | $ 19,158 | $ 18,873 |
Percentage of Loan Portfolio | 1.20% | 1.30% |
Commercial Mortgage | Senior mortgages |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Outstanding Principal | $ 532,125 | $ 503,499 |
Loans | $ 519,387 | $ 499,690 | 981,202
Percentage of Loan Portfolio | 32.10% | 30.90% |
Commercial Mortgage | Senior Securitized Mortgages |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Outstanding Principal | $ 940,245 | $ 940,546 |
Loans | $ 913,291 | $ 936,378 | 0
Percentage of Loan Portfolio | 56.60% | 57.80% |
Commercial Mortgage | Mezzanine loans |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Outstanding Principal | $ 187,693 | $ 183,064 |
Loans | $ 130,456 | $ 170,023 | $ 315,601
Percentage of Loan Portfolio | 11.30% | 11.30% |

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