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LOANS - CRE Debt and Preferred Equity Investments - Based on Outstanding Principal (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Real Estate [Roll Forward] |  |
Principal payments | $ (726,064) |
Ending balance, carrying value | 669,713 |
Commercial Mortgage |  |
Real Estate [Roll Forward] |  |
Beginning balance, carrying value | 1,296,803 | $ 1,029,327
Originations & advances (principal) | 593,913 | 628,177
Principal payments | (316,663) | (353,424)
Transfers | 40,058 |
Net (increase) decrease in origination fees | (4,384) | (6,994)
Amortization of net origination fees | 5,571 | 3,213
Allowance for loan losses | (9,207) | (3,496)
Ending balance, carrying value | 1,606,091 | 1,296,803
Commercial Mortgage | Senior Mortgages |  |
Real Estate [Roll Forward] |  |
Beginning balance, carrying value | 981,202 | 625,900
Originations & advances (principal) | 572,204 | 575,953
Principal payments | (16,785) | (216,849)
Transfers | (1,034,754) |
Net (increase) decrease in origination fees | (4,200) | (6,624)
Amortization of net origination fees | 2,023 | 2,822
Allowance for loan losses | 0 | 0
Ending balance, carrying value | 499,690 | 981,202
Commercial Mortgage | Senior Securitized Mortgages |  |
Real Estate [Roll Forward] |  |
Beginning balance, carrying value | 0 |
Originations & advances (principal) | 0 |
Principal payments | (150,245) |
Transfers | 1,083,487 |
Net (increase) decrease in origination fees | 0 |
Amortization of net origination fees | 3,136 |
Allowance for loan losses | 0 |
Ending balance, carrying value | 936,378 | 0
Commercial Mortgage | Preferred Equity |  |
Real Estate [Roll Forward] |  |
Beginning balance, carrying value | 0 | 8,985
Originations & advances (principal) |  | 0
Principal payments |  | (9,000)
Net (increase) decrease in origination fees |  | 0
Amortization of net origination fees |  | 15
Allowance for loan losses |  | 0
Ending balance, carrying value |  | 0
Mezzanine Loans | Commercial Mortgage |  |
Real Estate [Roll Forward] |  |
Beginning balance, carrying value | 315,601 | 394,442
Originations & advances (principal) | 21,709 | 52,224
Principal payments | (149,633) | (127,575)
Transfers | (8,675) |
Net (increase) decrease in origination fees | (184) | (370)
Amortization of net origination fees | 412 | 376
Allowance for loan losses | (9,207) | (3,496)
Ending balance, carrying value | $ 170,023 | $ 315,601

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