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Investments in Unconsolidated Entities - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2020
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated entities	$ 189,965	$ 73,466		$ 107,477
Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated entities	106,083	40,472
Equity method investment, fair value	$ 83,882	$ 32,994
Equity Method Investments | 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]
Equity method investment, ownership interest	45.00%	45.00%
Investments in unconsolidated entities	$ 10,108	$ 8,948
Changes in fair value, gain (loss)	$ 1,167	$ 1,050	$ 996
Equity Method Investments | Somerset Deerfield Investor, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest	45.00%	45.00%
Investments in unconsolidated entities	$ 17,417	$ 16,266
Changes in fair value, gain (loss)	$ 1,992	$ 251	0
Equity Method 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)
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest	43.00%	43.00%
Investments in unconsolidated entities	$ 4,878	$ 4,714
Changes in fair value, gain (loss)	$ 539	$ 76	0
Equity Method Investments | Audubon Mezzanine Holdings, L.L.C. (Series A)
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest	57.00%	57.00%
Investments in unconsolidated entities	$ 10,998	$ 10,544
Changes in fair value, gain (loss)	$ 1,224	$ 59	0
Equity Method Investments | 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]
Equity method investment, ownership interest	46.00%	0.00%
Investments in unconsolidated entities	$ 6,847	$ 0
Changes in fair value, gain (loss)	$ 741	$ 0	0
Equity Method Investments | Walnut Creek Properties Holdings, L.L.C.
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest	36.00%	0.00%
Investments in unconsolidated entities	$ 8,288	$ 0
Changes in fair value, gain (loss)	$ 803	$ 0	0
Equity Method Investments | Towers Property Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest	37.00%	0.00%
Investments in unconsolidated entities	$ 11,278	$ 0
Changes in fair value, gain (loss)	$ 638	$ 0	0
Equity Method Investments | Mansions Property Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest	34.00%	0.00%
Investments in unconsolidated entities	$ 10,867	$ 0
Changes in fair value, gain (loss)	$ 615	$ 0	0
Equity Method Investments | Sabina Montgomery Holdings, LLC - Series B and Oakley Shoals Apartments, LLC - Series A (collectively)
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest	43.00%	0.00%
Investments in unconsolidated entities	$ 4,062	$ 0
Changes in fair value, gain (loss)	$ 188	$ 0	0
Equity Method Investments | 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]
Equity method investment, ownership interest	37.00%	0.00%
Investments in unconsolidated entities	$ 9,396	$ 0
Changes in fair value, gain (loss)	$ 367	$ 0	0
Equity Method 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)
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest	53.00%	0.00%
Investments in unconsolidated entities	$ 11,944	$ 0
Changes in fair value, gain (loss)	267	0	0
Equity Method Investments | Autumnwood Investments LLC
Schedule of Equity Method Investments [Line Items]
Changes in fair value, gain (loss)	0	0	265
Equity Method Investments | 200 RHC Hoover, LLC
Schedule of Equity Method Investments [Line Items]
Changes in fair value, gain (loss)	$ 0	$ 0	275
Equity Method Investments | Evergreens JV Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest	0.00%	85.00%
Equity method investment, fair value	$ 0	$ 8,200
Changes in fair value, gain (loss)	$ 5,107	$ 4,312	571
Equity Method Investments | The Preserve at Port Royal Venture, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest	77.00%	77.00%
Equity method investment, fair value	$ 18,310	$ 13,840
Changes in fair value, gain (loss)	5,374	1,778	1,729
Equity Method Investments | WR Savannah Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Changes in fair value, gain (loss)	0	1,854	1,386
Equity Method Investments | Bent Tree JV Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Changes in fair value, gain (loss)	0	0	1,795
Equity Method Investments | Summerchase LR Partners LLC
Schedule of Equity Method Investments [Line Items]
Changes in fair value, gain (loss)	0	0	569
Equity Method Investments | Lake Mary Realty Partners, LLC
Schedule of Equity Method Investments [Line Items]
Changes in fair value, gain (loss)	$ 0	$ 0	2,745
Equity Method Investments | Morrocroft Neighborhood Stabilization Fund II, LP
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest	11.00%	11.00%
Equity method investment, fair value	$ 11,796	$ 10,954
Changes in fair value, gain (loss)	$ 843	$ 1,131	1,591
Equity Method Investments | Headlands Asset Management Fund III (Cayman), LP (Headlands Flagship Opportunity Fund Series I)
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest	49.00%	0.00%
Equity method investment, fair value	$ 53,776	$ 0
Changes in fair value, gain (loss)	$ 3,776	$ 0	$ 0

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