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Equity Investments, at Fair Value - (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |
Other income (losses) | $ 5,515,000 | $ 678,000 | $ 2,128,000
Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Other income (losses) | 2,800,000 |  |
Joint Venture Equity Investments in Multi-Family Properties |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Other income (losses) | 200,000 | 9,700,000 | 300,000
Realized gains (losses), net | 0 | 8,800,000 | 10,200,000
Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Other income (losses) | 400,000 | 300,000 |
Constructive Loans, LLC (1) | Single-Family Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Purchase of residential loans | 94,000,000 |  |
Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Fair Value | 180,798,000 | 182,765,000 |
Changes in fair value, gain (loss) | 24,633,000 | 16,587,000 | 8,541,000
Equity investments | Joint Venture Equity Investments in Multi-Family Properties |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Fair Value | 10,440,000 | 0 |
Changes in fair value, gain (loss) | 150,000 | (949,000) | 10,481,000
Equity investments | Single-Family Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Fair Value | 48,393,000 | 76,330,000 |
Changes in fair value, gain (loss) | 9,113,000 | 11,032,000 | 4,619,000
Equity investments | Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Fair Value | $ 239,631,000 | $ 259,095,000 |
Equity investments | Somerset Deerfield Investor, LLC | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 45.00% | 45.00% |
Fair Value | $ 19,965,000 | $ 18,792,000 |
Changes in fair value, gain (loss) | $ 2,295,000 | $ 2,168,000 | 1,992,000
Equity investments | 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) | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 43.00% | 43.00% |
Fair Value | $ 5,725,000 | $ 5,140,000 |
Changes in fair value, gain (loss) | $ 585,000 | $ 551,000 | 539,000
Equity investments | Walnut Creek Properties Holdings, L.L.C. | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 36.00% | 36.00% |
Fair Value | $ 9,482,000 | $ 8,803,000 |
Changes in fair value, gain (loss) | $ 1,240,000 | $ 928,000 | 803,000
Equity investments | DCP Gold Creek, LLC | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 44.00% | 44.00% |
Fair Value | $ 6,686,000 | $ 6,357,000 |
Changes in fair value, gain (loss) | $ 780,000 | $ 701,000 | 0
Equity investments | 1122 Chicago DE, LLC | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 53.00% | 53.00% |
Fair Value | $ 7,723,000 | $ 7,222,000 |
Changes in fair value, gain (loss) | $ 908,000 | $ 835,000 | 0
Equity investments | Rigsbee Ave Holdings, LLC | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 56.00% | 56.00% |
Fair Value | $ 11,331,000 | $ 10,222,000 |
Changes in fair value, gain (loss) | $ 1,683,000 | $ 1,148,000 | 0
Equity investments | Bighaus, LLC | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 42.00% | 42.00% |
Fair Value | $ 15,471,000 | $ 14,525,000 |
Changes in fair value, gain (loss) | $ 1,786,000 | $ 1,002,000 | 0
Equity investments | FF/RMI 20 Midtown, LLC | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 51.00% | 51.00% |
Fair Value | $ 25,499,000 | $ 23,936,000 |
Changes in fair value, gain (loss) | $ 3,059,000 | $ 686,000 | 0
Equity investments | Lurin-RMI, LLC | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 38.00% | 38.00% |
Fair Value | $ 9,548,000 | $ 7,216,000 |
Changes in fair value, gain (loss) | $ 931,000 | $ 81,000 | 0
Equity investments | Palms at Cape Coral, LLC | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 34.00% | 0.00% |
Fair Value | $ 5,175,000 | $ 0 |
Changes in fair value, gain (loss) | $ 342,000 | $ 0 | 0
Equity investments | America Walks at Port St. Lucie, LLC | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 62.00% | 0.00% |
Fair Value | $ 30,383,000 | $ 0 |
Changes in fair value, gain (loss) | $ 1,678,000 | $ 0 | 0
Equity investments | EHOF-NYMT Sunset Apartments Preferred, LLC | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 57.00% | 0.00% |
Fair Value | $ 17,213,000 | $ 0 |
Changes in fair value, gain (loss) | $ 661,000 | $ 0 | 0
Equity investments | Lucie at Tradition Holdings, LLC | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 70.00% | 0.00% |
Fair Value | $ 16,597,000 | $ 0 |
Changes in fair value, gain (loss) | $ 484,000 | $ 0 | 0
Equity investments | BBA-EP320 II, L.L.C., BBA-Ten10 II, L.L.C., and Lexington on the Green Apartments, L.L.C. (collectively) | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 0.00% | 45.00% |
Fair Value | $ 0 | $ 11,441,000 |
Changes in fair value, gain (loss) | $ 1,304,000 | $ 1,260,000 | 1,167,000
Equity investments | Audubon Mezzanine Holdings, L.L.C. (Series A) | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 0.00% | 57.00% |
Fair Value | $ 0 | $ 11,456,000 |
Changes in fair value, gain (loss) | $ 1,251,000 | $ 1,213,000 | 1,224,000
Equity investments | EP 320 Growth Fund, L.L.C. (Series A) and Turnbury Park Apartments - BC, L.L.C. (Series A) (collectively) | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 0.00% | 46.00% |
Fair Value | $ 0 | $ 7,234,000 |
Changes in fair value, gain (loss) | $ 735,000 | $ 782,000 | 741,000
Equity investments | Towers Property Holdings, LLC | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 0.00% | 37.00% |
Fair Value | $ 0 | $ 12,119,000 |
Changes in fair value, gain (loss) | $ 1,192,000 | $ 1,243,000 | 638,000
Equity investments | Mansions Property Holdings, LLC | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 0.00% | 34.00% |
Fair Value | $ 0 | $ 11,679,000 |
Changes in fair value, gain (loss) | $ 1,148,000 | $ 1,198,000 | 615,000
Equity investments | Sabina Montgomery Holdings, LLC - Series B and Oakley Shoals Apartments, LLC - Series A (collectively) | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 0.00% | 43.00% |
Fair Value | $ 0 | $ 4,320,000 |
Changes in fair value, gain (loss) | $ 412,000 | $ 454,000 | 188,000
Equity investments | Gen1814, LLC - Series A, Highlands - Mtg. Holdings, LLC - Series A, and Polos at Hudson Investments, LLC - Series A (collectively) | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 0.00% | 37.00% |
Fair Value | $ 0 | $ 9,966,000 |
Changes in fair value, gain (loss) | $ 966,000 | $ 1,044,000 | 367,000
Equity investments | 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) | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 0.00% | 53.00% |
Fair Value | $ 0 | $ 12,337,000 |
Changes in fair value, gain (loss) | $ 1,193,000 | $ 1,293,000 | 267,000
Equity investments | GWR Cedars Partners, LLC | Joint Venture Equity Investments in Multi-Family Properties |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 70.00% | 0.00% |
Fair Value | $ 3,770,000 | $ 0 |
Changes in fair value, gain (loss) | $ 60,000 | $ 0 | 0
Equity investments | GWR Gateway Partners, LLC | Joint Venture Equity Investments in Multi-Family Properties |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 70.00% | 0.00% |
Fair Value | $ 6,670,000 | $ 0 |
Changes in fair value, gain (loss) | $ 90,000 | $ 0 | 0
Equity investments | Morrocroft Neighborhood Stabilization Fund II, LP | Single-Family Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 11.00% | 11.00% |
Fair Value | $ 19,143,000 | $ 13,040,000 |
Changes in fair value, gain (loss) | $ 6,378,000 | $ 1,519,000 | 843,000
Equity investments | Constructive Loans, LLC (1) | Single-Family Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 0.00% | 0.00% |
Fair Value | $ 29,250,000 | $ 0 |
Other income (losses) | 2,800,000 |  |
Changes in fair value, gain (loss) | $ 2,750,000 | $ 0 | 0
Option to purchase issued and outstanding interests, percent | 50.00% |  |
Equity investments | Headlands Asset Management Fund III (Cayman), LP (Headlands Flagship Opportunity Fund Series I) (1) | Single-Family Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 0.00% | 49.00% |
Fair Value | $ 0 | $ 63,290,000 |
Changes in fair value, gain (loss) | (15,000) | 9,513,000 | 3,776,000
Equity investments | The Preserve at Port Royal Venture, LLC | Joint Venture Equity Investments in Multi-Family Properties |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 0 | (949,000) | 5,374,000
Equity investments | Evergreens JV Holdings, LLC | Joint Venture Equity Investments in Multi-Family Properties |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | $ 0 | $ 0 | $ 5,107,000

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