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Equity Investments, at Fair Value - Schedule of Equity Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Constructive Loans, LLC | Single-Family Equity Ownership Interests
Schedule of Equity Method Investments [Line Items]
Purchase of residential loans	$ 260,600	$ 94,000
Equity investments | Multi-Family Preferred Equity Ownership Interests
Schedule of Equity Method Investments [Line Items]
Fair Value	152,246	180,798
Changes in fair value, gain (loss)	18,670	24,633	$ 16,587
Equity investments | Joint Venture Equity Investments in Multi-Family Properties
Schedule of Equity Method Investments [Line Items]
Fair Value	0	10,440
Changes in fair value, gain (loss)	(1,430)	150	(949)
Equity investments | Single-Family Equity Ownership Interests
Schedule of Equity Method Investments [Line Items]
Fair Value	27,500	48,393
Changes in fair value, gain (loss)	(2,166)	9,113	11,032
Equity investments | Preferred Equity Ownership Interests
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 179,746	$ 239,631
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	$ 8,276	$ 7,723
Changes in fair value, gain (loss)	$ 959	$ 908	835
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	$ 16,482	$ 15,471
Changes in fair value, gain (loss)	$ 1,852	$ 1,786	1,002
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	$ 27,079	$ 25,499
Changes in fair value, gain (loss)	$ 2,904	$ 3,059	686
Equity investments | Palms at Cape Coral, LLC | Multi-Family Preferred Equity Ownership Interests
Schedule of Equity Method Investments [Line Items]
Ownership Interest	34.00%	34.00%
Fair Value	$ 5,429	$ 5,175
Changes in fair value, gain (loss)	$ 554	$ 342	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%	62.00%
Fair Value	$ 29,873	$ 30,383
Changes in fair value, gain (loss)	$ 3,140	$ 1,678	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%	57.00%
Fair Value	$ 18,139	$ 17,213
Changes in fair value, gain (loss)	$ 1,939	$ 661	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%	70.00%
Fair Value	$ 17,576	$ 16,597
Changes in fair value, gain (loss)	$ 2,008	$ 484	0
Equity investments | Syracuse Apartments and Townhomes, LLC | Multi-Family Preferred Equity Ownership Interests
Schedule of Equity Method Investments [Line Items]
Ownership Interest	58.00%	0.00%
Fair Value	$ 20,115	$ 0
Changes in fair value, gain (loss)	$ 1,816	$ 0	0
Equity investments | 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) | Multi-Family Preferred Equity Ownership Interests
Schedule of Equity Method Investments [Line Items]
Ownership Interest	58.00%	0.00%
Fair Value	$ 9,277	$ 0
Changes in fair value, gain (loss)	$ 540	$ 0	0
Equity investments | DCP Gold Creek, LLC | Multi-Family Preferred Equity Ownership Interests
Schedule of Equity Method Investments [Line Items]
Ownership Interest	0.00%	44.00%
Fair Value	$ 0	$ 6,686
Changes in fair value, gain (loss)	$ 254	$ 780	701
Equity investments | Rigsbee Ave Holdings, LLC | Multi-Family Preferred Equity Ownership Interests
Schedule of Equity Method Investments [Line Items]
Ownership Interest	0.00%	56.00%
Fair Value	$ 0	$ 11,331
Changes in fair value, gain (loss)	$ (174)	$ 1,683	1,148
Equity investments | Walnut Creek Properties Holdings, L.L.C. | Multi-Family Preferred Equity Ownership Interests
Schedule of Equity Method Investments [Line Items]
Ownership Interest	0.00%	36.00%
Fair Value	$ 0	$ 9,482
Changes in fair value, gain (loss)	$ (153)	$ 1,240	928
Equity investments | Lurin-RMI, LLC | Multi-Family Preferred Equity Ownership Interests
Schedule of Equity Method Investments [Line Items]
Ownership Interest	0.00%	38.00%
Fair Value	$ 0	$ 9,548
Changes in fair value, gain (loss)	$ 558	$ 931	81
Equity investments | Somerset Deerfield Investor, LLC | Multi-Family Preferred Equity Ownership Interests
Schedule of Equity Method Investments [Line Items]
Ownership Interest	0.00%	45.00%
Fair Value	$ 0	$ 19,965
Changes in fair value, gain (loss)	$ 1,944	$ 2,295	2,168
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	0.00%	43.00%
Fair Value	$ 0	$ 5,725
Changes in fair value, gain (loss)	$ 529	$ 585	551
Equity investments | GWR Cedars Partners, LLC | Joint Venture Equity Investments in Multi-Family Properties
Schedule of Equity Method Investments [Line Items]
Ownership Interest	0.00%	70.00%
Fair Value	$ 0	$ 3,770
Changes in fair value, gain (loss)	$ (1,050)	$ 60	0
Equity investments | GWR Gateway Partners, LLC | Joint Venture Equity Investments in Multi-Family Properties
Schedule of Equity Method Investments [Line Items]
Ownership Interest	0.00%	70.00%
Fair Value	$ 0	$ 6,670
Changes in fair value, gain (loss)	$ (380)	$ 90	0
Equity investments | Constructive Loans, LLC | Single-Family Equity Ownership Interests
Schedule of Equity Method Investments [Line Items]
Ownership Interest	0.00%	0.00%
Fair Value	$ 27,500	$ 29,250
Option to purchase issued and outstanding interests, percent	50.00%
Changes in fair value, gain (loss)	$ (1,750)	$ 2,750	0
Equity investments | Morrocroft Neighborhood Stabilization Fund II, LP | Single-Family Equity Ownership Interests
Schedule of Equity Method Investments [Line Items]
Ownership Interest	0.00%	11.00%
Fair Value	$ 0	$ 19,143
Changes in fair value, gain (loss)	$ (416)	$ 6,378	$ 1,519

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