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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 | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | $ 6,029 | $ 6,336 | $ 11,804 | $ 11,835
Somerset Deerfield Investor, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 596 | 675 | 1,183 | 1,141
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) | 163 | 174 | 322 | 298
DCP Gold Creek, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | (599) | 197 | 254 | 400
1122 Chicago DE, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 241 | 225 | 478 | 446
Bighaus, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 472 | 443 | 937 | 879
FF/RMI 20 Midtown, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 812 | 758 | 1,610 | 1,504
Lurin-RMI, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 1,520 | 235 | 1,800 | 470
Palms at Cape Coral, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 158 | 0 | 313 | 0
America Walks at Port St. Lucie, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 902 | 0 | 1,804 | 0
EHOF-NYMT Sunset Apartments Preferred, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 559 | 0 | 1,108 | 0
Lucie at Tradition Holdings, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 614 | 0 | 1,215 | 0
Syracuse Apartments and Townhomes, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 591 | 0 | 1,107 | 0
Rigsbee Ave Holdings, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 0 | 896 | (174) | 1,215
Walnut Creek Properties Holdings, L.L.C. |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 0 | 263 | (153) | 541
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 | 357 | 0 | 704
Audubon Mezzanine Holdings, L.L.C. (Series A) |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 0 | 357 | 0 | 721
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 | 240 | 0 | 419
Towers Property Holdings, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 0 | 361 | 0 | 740
Mansions Property Holdings, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Change in fair value, gain (loss) | 0 | 348 | 0 | 713
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 | 131 | 0 | 266
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 | 302 | 0 | 616
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 | $ 374 | $ 0 | $ 762

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