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Investment in Unconsolidated Entities (Details) - Equity Method Investments - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Carrying Amount	$ 8,519		$ 8,519		$ 8,320
Carrying Amount, fair value option	$ 45,152		$ 45,152		$ 42,823
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%
Carrying Amount	$ 8,519		$ 8,519		$ 8,320
Income from investments in unconsolidated entities	$ 259	$ 247	$ 512	$ 488
Morrocroft Neighborhood Stabilization Fund II, LP
Schedule of Equity Method Investments [Line Items]
Ownership Interest	11.00%		11.00%		11.00%
Carrying Amount, fair value option	$ 13,302		$ 13,302		$ 12,623
Income from investments in unconsolidated entities	$ 398	332	$ 680	980
Evergreens JV Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	85.00%		85.00%		85.00%
Carrying Amount, fair value option	$ 4,420		$ 4,420		$ 4,220
Income from investments in unconsolidated entities	$ 171	139	$ 365	303
The Preserve at Port Royal Venture, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	77.00%		77.00%		77.00%
Carrying Amount, fair value option	$ 13,430		$ 13,430		$ 13,040
Income from investments in unconsolidated entities	$ 419	441	$ 902	826
WR Savannah Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	90.00%		90.00%		90.00%
Carrying Amount, fair value option	$ 14,000		$ 14,000		$ 12,940
Income from investments in unconsolidated entities	1,269	295	1,629	625
Autumnwood Investments LLC
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	0	73	0	73
200 RHC Hoover, LLC
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	0	0	0	275
Bent Tree JV Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	0	297	0	585
Summerchase LR Partners LLC
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	0	180	0	362
Lake Mary Realty Partners, LLC
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	$ 0	$ 222	$ 0	$ 433

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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