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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 | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | $ 4,678 | $ 1,455 | $ 15,660 | $ 13,260
FF/RMI 20 Midtown, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 955 | 287 | 2,690 | 1,897
Palms at Cape Coral, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 183 | 68 | 540 | 381
America Walks at Port St. Lucie, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 345 | 376 | 2,243 | 2,180
EHOF-NYMT Sunset Apartments Preferred, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 651 | 219 | 1,914 | 1,327
Lucie at Tradition Holdings, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 719 | 126 | 2,103 | 1,342
Syracuse Apartments and Townhomes, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 679 | 67 | 2,000 | 1,174
Hudson Bridge Apartments, LLC - Series A, Briar Hill Apartments, LLC, Kings Glen Apartments, LLC, Flagstone Apartments, LLC, Brookfield Apartments II, LLC - Series B, and Silber JBSM Properties, LLC (collectively) |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 311 | 243 | 918 | 243
Tides on 27th Investors, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 599 | 0 | 1,896 | 0
Rapid City RMI JV LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 236 | 0 | 236 | 0
1122 Chicago DE, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 0 | 212 | 419 | 690
Bighaus, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 0 | 388 | 701 | 1,325
Lurin-RMI, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 0 | (1,242) | 0 | 558
Somerset Deerfield Investor, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 0 | 548 | 0 | 1,731
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) | 0 | 163 | 0 | 485
DCP Gold Creek, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 0 | 0 | 0 | 254
Rigsbee Ave Holdings, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 0 | 0 | 0 | (174)
Walnut Creek Properties Holdings, L.L.C. |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | $ 0 | $ 0 | $ 0 | $ (153)

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