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Investment in Unconsolidated Entities (Details) - Equity Method Investments - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Carrying Amount	$ 8,417		$ 8,320
Carrying Amount, fair value option	$ 43,504		$ 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%
Carrying Amount	$ 8,417		$ 8,320
Income from investments in unconsolidated entities	$ 253	$ 242
Morrocroft Neighborhood Stabilization Fund II, LP
Schedule of Equity Method Investments [Line Items]
Ownership Interest	11.00%		11.00%
Carrying Amount, fair value option	$ 12,904		$ 12,623
Income from investments in unconsolidated entities	$ 282	649
Evergreens JV Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	85.00%		85.00%
Carrying Amount, fair value option	$ 4,320		$ 4,220
Income from investments in unconsolidated entities	$ 194	164
The Preserve at Port Royal Venture, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	77.00%		77.00%
Carrying Amount, fair value option	$ 13,250		$ 13,040
Income from investments in unconsolidated entities	$ 483	385
WR Savannah Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	90.00%		90.00%
Carrying Amount, fair value option	$ 13,030		$ 12,940
Income from investments in unconsolidated entities	361	330
200 RHC Hoover, LLC
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	0	275
Bent Tree JV Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	0	288
Summerchase LR Partners LLC
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	0	182
Lake Mary Realty Partners, LLC
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	$ 0	$ 211

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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