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Equity Investments, at Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Gain (loss) from equity investments	$ 3,399	$ 494
Preferred Equity Ownership Interests
Schedule of Equity Method Investments [Line Items]
Gain (loss) from equity investments	$ 100	4,300
Investment in unconsolidated entities | Morrocroft Neighborhood Stabilization Fund II, LP
Schedule of Equity Method Investments [Line Items]
Ownership Interest	11.00%		11.00%
Fair Value	$ 14,228		$ 13,040
Change in fair value, gain (loss)	$ 1,188	218
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%
Fair Value	$ 60,002		$ 63,290
Change in fair value, gain (loss)	(3,288)	1,000
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests
Schedule of Equity Method Investments [Line Items]
Fair Value	185,835		$ 182,765
Change in fair value, gain (loss)	$ 5,499	(963)
Investment in unconsolidated entities | Multi-Family 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%
Fair Value	$ 11,788		$ 11,441
Change in fair value, gain (loss)	$ 347	245
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | Somerset Deerfield Investor, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	45.00%		45.00%
Fair Value	$ 18,978		$ 18,792
Change in fair value, gain (loss)	$ 466	159
Investment in unconsolidated entities | Multi-Family 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, LLC and RS SWD Saltzman Owner, LLC (collectively)
Schedule of Equity Method Investments [Line Items]
Ownership Interest	43.00%		43.00%
Fair Value	$ 5,264		$ 5,140
Change in fair value, gain (loss)	$ 124	(66)
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | Audubon Mezzanine Holdings, L.L.C. (Series A)
Schedule of Equity Method Investments [Line Items]
Ownership Interest	57.00%		57.00%
Fair Value	$ 11,771		$ 11,456
Change in fair value, gain (loss)	$ 364	(109)
Investment in unconsolidated entities | Multi-Family 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%
Fair Value	$ 7,300		$ 7,234
Change in fair value, gain (loss)	$ 179	(101)
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | Walnut Creek Properties Holdings, L.L.C.
Schedule of Equity Method Investments [Line Items]
Ownership Interest	36.00%		36.00%
Fair Value	$ 8,940		$ 8,803
Change in fair value, gain (loss)	$ 277	(94)
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | Towers Property Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	37.00%		37.00%
Fair Value	$ 12,333		$ 12,119
Change in fair value, gain (loss)	$ 379	(161)
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | Mansions Property Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	34.00%		34.00%
Fair Value	$ 11,885		$ 11,679
Change in fair value, gain (loss)	$ 365	(155)
Investment in unconsolidated entities | Multi-Family 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%
Fair Value	$ 4,385		$ 4,320
Change in fair value, gain (loss)	$ 135	(54)
Investment in unconsolidated entities | Multi-Family 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%
Fair Value	$ 10,117		$ 9,966
Change in fair value, gain (loss)	$ 314	(131)
Investment in unconsolidated entities | Multi-Family 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%
Fair Value	$ 12,515		$ 12,337
Change in fair value, gain (loss)	$ 388	(169)
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | DCP Gold Creek, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	44.00%		44.00%
Fair Value	$ 6,469		$ 6,357
Change in fair value, gain (loss)	$ 202	(120)
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | 1122 Chicago DE, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	53.00%		53.00%
Fair Value	$ 7,342		$ 7,222
Change in fair value, gain (loss)	$ 221	(60)
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | Rigsbee Ave Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	56.00%		56.00%
Fair Value	$ 10,398		$ 10,222
Change in fair value, gain (loss)	$ 320	(147)
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | Bighaus, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	42.00%		42.00%
Fair Value	$ 14,751		$ 14,525
Change in fair value, gain (loss)	$ 436	0
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | FF/RMI 20 Midtown, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	51.00%		51.00%
Fair Value	$ 24,243		$ 23,936
Change in fair value, gain (loss)	$ 746	0
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | Lurin-RMI, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	38.00%		38.00%
Fair Value	$ 7,356		$ 7,216
Change in fair value, gain (loss)	236	0
Investment in unconsolidated entities | Single-Family Equity Ownership Interests
Schedule of Equity Method Investments [Line Items]
Fair Value	74,230		76,330
Change in fair value, gain (loss)	(2,100)	1,218
Investment in unconsolidated entities | Preferred Equity Ownership Interests
Schedule of Equity Method Investments [Line Items]
Fair Value	260,065		$ 259,095
Investment in unconsolidated entities | Joint Venture Equity Investments In Multi-family Properties
Schedule of Equity Method Investments [Line Items]
Gain (loss) from equity investments		200
Change in fair value, gain (loss)	0	239
Investment in unconsolidated entities | Joint Venture Equity Investments In Multi-family Properties | The Preserve at Port Royal Venture, LLC
Schedule of Equity Method Investments [Line Items]
Change in fair value, gain (loss)	$ 0	$ 239

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