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LOANS - Summary of Commercial Real Estate Investments Held for Investment (Details) - USD ($) $ in Thousands | Jun. 30, 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 | $ 74,833,896 | $ 113,123,301 |
Commercial Mortgage |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Outstanding Principal | 1,650,304 | 1,627,109 |
Loans | $ 1,493,504 | $ 1,606,091 | $ 1,296,803
Percentage of Loan Portfolio | 100.00% | 100.00% |
Carrying value, unamortized origination fees | $ 6,900 | $ 8,300 |
Commercial Mortgage | Office |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Loans | $ 660,994 | $ 681,129 |
Percentage of Loan Portfolio | 44.20% | 42.40% |
Commercial Mortgage | Retail |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Loans | $ 326,695 | $ 389,076 |
Percentage of Loan Portfolio | 21.90% | 24.20% |
Commercial Mortgage | Multifamily |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Loans | $ 279,943 | $ 262,302 |
Percentage of Loan Portfolio | 18.70% | 16.30% |
Commercial Mortgage | Hotel |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Loans | $ 116,053 | $ 135,681 |
Percentage of Loan Portfolio | 7.80% | 8.40% |
Commercial Mortgage | Industrial |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Loans | $ 59,137 | $ 82,441 |
Percentage of Loan Portfolio | 4.00% | 5.10% |
Commercial Mortgage | Other |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Loans | $ 31,637 | $ 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 | $ 19,045 | $ 18,873 |
Percentage of Loan Portfolio | 1.30% | 1.30% |
Commercial Mortgage | Senior mortgages |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Outstanding Principal | $ 512,278 | $ 503,499 |
Loans | $ 496,765 | $ 499,690 | 981,202
Percentage of Loan Portfolio | 31.00% | 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 | $ 939,951 | $ 940,546 |
Loans | $ 874,618 | $ 936,378 | 0
Percentage of Loan Portfolio | 57.00% | 57.80% |
Commercial Mortgage | Mezzanine loans |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Outstanding Principal | $ 198,075 | $ 183,064 |
Loans | $ 122,121 | $ 170,023 | $ 315,601
Percentage of Loan Portfolio | 12.00% | 11.30% |

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