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Equity Investments, at Fair Value - Schedule of Income From Multi-Family Preferred Equity Ownership Interests (Details) - Multi-Family Preferred Equity Ownership Interests - Equity investments - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Schedule of Equity Method Investments [Line Items] |  |
Change in fair value, gain (loss) | $ 5,775 | $ 5,499
Somerset Deerfield Investor, LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Change in fair value, gain (loss) | 587 | 466
RS SWD Owner, LLC, RS SWD Mitchell Owner, LLC, RS SWD IF Owner, LLC, RS SWD Mullis Owner, LLC, RS SWD JH Mullis Owner, LLC and RS SWD Saltzman Owner, LLC (collectively) |  |
Schedule of Equity Method Investments [Line Items] |  |
Change in fair value, gain (loss) | 159 | 124
Walnut Creek Properties Holdings, L.L.C. |  |
Schedule of Equity Method Investments [Line Items] |  |
Change in fair value, gain (loss) | (153) | 277
DCP Gold Creek, LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Change in fair value, gain (loss) | 853 | 202
1122 Chicago DE, LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Change in fair value, gain (loss) | 237 | 221
Rigsbee Ave Holdings, LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Change in fair value, gain (loss) | (174) | 320
Bighaus, LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Change in fair value, gain (loss) | 465 | 436
FF/RMI 20 Midtown, LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Change in fair value, gain (loss) | 798 | 746
Lurin-RMI, LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Change in fair value, gain (loss) | 280 | 236
Palms at Cape Coral, LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Change in fair value, gain (loss) | 155 | 0
America Walks at Port St. Lucie, LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Change in fair value, gain (loss) | 902 | 0
EHOF-NYMT Sunset Apartments Preferred, LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Change in fair value, gain (loss) | 549 | 0
Lucie at Tradition Holdings, LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Change in fair value, gain (loss) | 601 | 0
Syracuse Apartments and Townhomes, LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Change in fair value, gain (loss) | 516 | 0
BBA-EP320 II, L.L.C., BBA-Ten10 II, L.L.C., and Lexington on the Green Apartments, L.L.C. (collectively) |  |
Schedule of Equity Method Investments [Line Items] |  |
Change in fair value, gain (loss) | 0 | 347
Audubon Mezzanine Holdings, L.L.C. (Series A) |  |
Schedule of Equity Method Investments [Line Items] |  |
Change in fair value, gain (loss) | 0 | 364
EP 320 Growth Fund, L.L.C. (Series A) and Turnbury Park Apartments - BC, L.L.C. (Series A) (collectively) |  |
Schedule of Equity Method Investments [Line Items] |  |
Change in fair value, gain (loss) | 0 | 179
Towers Property Holdings, LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Change in fair value, gain (loss) | 0 | 379
Mansions Property Holdings, LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Change in fair value, gain (loss) | 0 | 365
Sabina Montgomery Holdings, LLC - Series B and Oakley Shoals Apartments, LLC - Series A (collectively) |  |
Schedule of Equity Method Investments [Line Items] |  |
Change in fair value, gain (loss) | 0 | 135
Gen1814, LLC - Series A, Highlands - Mtg. Holdings, LLC - Series A, and Polos at Hudson Investments, LLC - Series A (collectively) |  |
Schedule of Equity Method Investments [Line Items] |  |
Change in fair value, gain (loss) | 0 | 314
Axis Apartments Holdings, LLC, Arbor-Stratford Holdings II, LLC - Series B, Highlands - Mtg. Holdings, LLC - Series B, Oakley Shoals Apartments, LLC - Series C, and Woodland Park Apartments II, LLC (collectively) |  |
Schedule of Equity Method Investments [Line Items] |  |
Change in fair value, gain (loss) | $ 0 | $ 388

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