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Investments in Unconsolidated Entities (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments in unconsolidated entities | $ 218,706,000 |  | $ 218,706,000 |  | $ 189,965,000
Other income (losses) | 10,397,000 | $ 3,938,000 | 14,910,000 | $ 14,620,000 |
Realized gain | (1,067,000) | 6,102,000 | (149,919,000) | 32,556,000 |
Preferred Equity Ownership Interests |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Other income (losses) | 6,700 |  | (4,100,000) |  |
Investment in unconsolidated entities |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Fair Value | 73,456,000 |  | 73,456,000 |  | $ 83,882,000
Other income (losses) | (8,600,000) | (9,100,000) | (9,700,000) | (3,800,000) |
Realized gain |  | 10,100,000 | 8,800,000 | 10,100,000 |
Investment in unconsolidated entities | 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] |  |  |  |  |
Income from investments in unconsolidated entities | 295,000 | 299,000 | 898,000 | 860,000 |
Investment in unconsolidated entities | Somerset Deerfield Investor, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Income from investments in unconsolidated entities | 472,000 | 506,000 | 1,259,000 | 1,477,000 |
Investment in unconsolidated entities | RS SWD Owner, LLC, RS SWD Mitchell Owner, LLC, RS SWD IF Owner, LLC, RS SWD Mullis Owner, LLC, RS SWD JH Mullis Owner, and RS SWD Saltzman Owner, LLC (collectively) |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Income from investments in unconsolidated entities | 125,000 | 136,000 | 217,000 | 401,000 |
Investment in unconsolidated entities | Audubon Mezzanine Holdings, LLC (Series A) |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Income from investments in unconsolidated entities | 365,000 | 310,000 | 541,000 | 911,000 |
Investment in unconsolidated entities | 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] |  |  |  |  |
Income from investments in unconsolidated entities | 181,000 | 192,000 | 305,000 | 546,000 |
Investment in unconsolidated entities | Walnut Creek Properties Holdings, L.L.C. |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Income from investments in unconsolidated entities | 280,000 | 236,000 | 402,000 | 564,000 |
Investment in unconsolidated entities | Towers Property Holdings, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Income from investments in unconsolidated entities | 380,000 | 311,000 | 502,000 | 322,000 |
Investment in unconsolidated entities | Mansions Property Holdings, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Income from investments in unconsolidated entities | 366,000 | 300,000 | 484,000 | 310,000 |
Investment in unconsolidated entities | Sabina Montgomery Holdings, LLC - Series B and Oakley Shoals Apartments, LLC - Series A (collectively) |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Income from investments in unconsolidated entities | 137,000 | 70,000 | 190,000 | 70,000 |
Investment in unconsolidated entities | 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] |  |  |  |  |
Income from investments in unconsolidated entities | 317,000 | 96,000 | 430,000 | 96,000 |
Investment in unconsolidated entities | 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] |  |  |  |  |
Income from investments in unconsolidated entities | 392,000 | 0 | 527,000 | 0 |
Investment in unconsolidated entities | DCP Gold Creek, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Income from investments in unconsolidated entities | 203,000 | 0 | 305,000 | 0 |
Investment in unconsolidated entities | 1122 Chicago DE, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Income from investments in unconsolidated entities | 226,000 | 0 | 462,000 | 0 |
Investment in unconsolidated entities | Rigsbee Ave Holdings, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Income from investments in unconsolidated entities | 326,000 | 0 | 604,000 | 0 |
Investment in unconsolidated entities | Bighaus, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Income from investments in unconsolidated entities | $ 237,000 | 0 | $ 237,000 | 0 |
Investment in unconsolidated entities | The Preserve at Port Royal Venture, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 0.00% |  | 0.00% |  | 77.00%
Fair Value | $ 0 |  | $ 0 |  | $ 18,310,000
Income from investments in unconsolidated entities | $ 122,000 | 449,000 | $ (949,000) | 1,295,000 |
Investment in unconsolidated entities | Morrocroft Neighborhood Stabilization Fund II, LP |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 11.00% |  | 11.00% |  | 11.00%
Fair Value | $ 12,602,000 |  | $ 12,602,000 |  | $ 11,796,000
Income from investments in unconsolidated entities | $ 515,000 | 215,000 | $ 1,080,000 | 610,000 |
Investment in unconsolidated entities | Headlands Asset Management Fund III (Cayman), LP (Headlands Flagship Opportunity Fund Series I) |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 49.00% |  | 49.00% |  | 49.00%
Fair Value | $ 60,854,000 |  | $ 60,854,000 |  | $ 53,776,000
Income from investments in unconsolidated entities | 5,027,000 | 215,000 | 7,078,000 | 215,000 |
Investment in unconsolidated entities | Evergreens JV Holdings, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Income from investments in unconsolidated entities | 0 | $ 536,000 | 0 | $ 5,049,000 |
Investment in unconsolidated entities | Preferred Equity Ownership Interests |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Fair Value | $ 145,250,000 |  | $ 145,250,000 |  |
Investments in unconsolidated entities |  |  |  |  | $ 106,083,000
Investment in unconsolidated entities | Preferred Equity Ownership Interests | 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] |  |  |  |  |
Ownership Interest | 45.00% |  | 45.00% |  | 45.00%
Fair Value | $ 11,101,000 |  | $ 11,101,000 |  |
Investments in unconsolidated entities |  |  |  |  | $ 10,108,000
Investment in unconsolidated entities | Preferred Equity Ownership Interests | Somerset Deerfield Investor, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 45.00% |  | 45.00% |  | 45.00%
Fair Value | $ 18,083,000 |  | $ 18,083,000 |  |
Investments in unconsolidated entities |  |  |  |  | $ 17,417,000
Investment in unconsolidated entities | Preferred Equity Ownership Interests | RS SWD Owner, LLC, RS SWD Mitchell Owner, LLC, RS SWD IF Owner, LLC, RS SWD Mullis Owner, LLC, RS SWD JH Mullis Owner, and RS SWD Saltzman Owner, LLC (collectively) |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 43.00% |  | 43.00% |  | 43.00%
Fair Value | $ 4,900,000 |  | $ 4,900,000 |  |
Investments in unconsolidated entities |  |  |  |  | $ 4,878,000
Investment in unconsolidated entities | Preferred Equity Ownership Interests | Audubon Mezzanine Holdings, LLC (Series A) |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 57.00% |  | 57.00% |  | 57.00%
Fair Value | $ 10,994,000 |  | $ 10,994,000 |  |
Investments in unconsolidated entities |  |  |  |  | $ 10,998,000
Investment in unconsolidated entities | Preferred Equity Ownership Interests | 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] |  |  |  |  |
Ownership Interest | 46.00% |  | 46.00% |  | 46.00%
Fair Value | $ 6,871,000 |  | $ 6,871,000 |  |
Investments in unconsolidated entities |  |  |  |  | $ 6,847,000
Investment in unconsolidated entities | Preferred Equity Ownership Interests | Walnut Creek Properties Holdings, L.L.C. |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 36.00% |  | 36.00% |  | 36.00%
Fair Value | $ 8,417,000 |  | $ 8,417,000 |  |
Investments in unconsolidated entities |  |  |  |  | $ 8,288,000
Investment in unconsolidated entities | Preferred Equity Ownership Interests | Towers Property Holdings, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 37.00% |  | 37.00% |  | 37.00%
Fair Value | $ 11,544,000 |  | $ 11,544,000 |  |
Investments in unconsolidated entities |  |  |  |  | $ 11,278,000
Investment in unconsolidated entities | Preferred Equity Ownership Interests | Mansions Property Holdings, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 34.00% |  | 34.00% |  | 34.00%
Fair Value | $ 11,124,000 |  | $ 11,124,000 |  |
Investments in unconsolidated entities |  |  |  |  | $ 10,867,000
Investment in unconsolidated entities | Preferred Equity Ownership Interests | Sabina Montgomery Holdings, LLC - Series B and Oakley Shoals Apartments, LLC - Series A (collectively) |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 43.00% |  | 43.00% |  | 43.00%
Fair Value | $ 4,127,000 |  | $ 4,127,000 |  |
Investments in unconsolidated entities |  |  |  |  | $ 4,062,000
Investment in unconsolidated entities | Preferred Equity Ownership Interests | 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] |  |  |  |  |
Ownership Interest | 37.00% |  | 37.00% |  | 37.00%
Fair Value | $ 9,514,000 |  | $ 9,514,000 |  |
Investments in unconsolidated entities |  |  |  |  | $ 9,396,000
Investment in unconsolidated entities | Preferred Equity Ownership Interests | 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] |  |  |  |  |
Ownership Interest | 53.00% |  | 53.00% |  | 53.00%
Fair Value | $ 11,781,000 |  | $ 11,781,000 |  |
Investments in unconsolidated entities |  |  |  |  | $ 11,944,000
Investment in unconsolidated entities | Preferred Equity Ownership Interests | DCP Gold Creek, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 44.00% |  | 44.00% |  | 0.00%
Fair Value | $ 6,050,000 |  | $ 6,050,000 |  |
Investments in unconsolidated entities |  |  |  |  | $ 0
Investment in unconsolidated entities | Preferred Equity Ownership Interests | 1122 Chicago DE, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 53.00% |  | 53.00% |  | 0.00%
Fair Value | $ 6,951,000 |  | $ 6,951,000 |  |
Investments in unconsolidated entities |  |  |  |  | $ 0
Investment in unconsolidated entities | Preferred Equity Ownership Interests | Rigsbee Ave Holdings, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 56.00% |  | 56.00% |  | 0.00%
Fair Value | $ 9,823,000 |  | $ 9,823,000 |  |
Investments in unconsolidated entities |  |  |  |  | $ 0
Investment in unconsolidated entities | Preferred Equity Ownership Interests | Bighaus, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 42.00% |  | 42.00% |  | 0.00%
Fair Value | $ 13,970,000 |  | $ 13,970,000 |  |
Investments in unconsolidated entities |  |  |  |  | $ 0

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