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Investment in Unconsolidated Entities (Details) - Equity Method Investments - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Carrying Amount	$ 10,242		$ 10,242		$ 18,927
Carrying Amount, fair value option	$ 41,026		$ 41,026		$ 60,332
Autumnwood Investments LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	0.00%		0.00%		0.00%
Carrying Amount	$ 2,020		$ 2,020		$ 2,092
Income from investments in unconsolidated entities	$ 64	$ 71	$ 137	$ 213
200 RHC Hoover, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	0.00%		0.00%		63.00%
Carrying Amount	$ 0		$ 0		$ 8,886
Income from investments in unconsolidated entities	$ 0	276	$ 275	1,091
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	$ 8,222		$ 8,222		$ 7,949
Income from investments in unconsolidated entities	252	189	741	189
RiverBanc LLC
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	0	0	0	125
Kiawah River View Investors LLC
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	0	0	0	1,250
RB Development Holding Company, LLC
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	0	0	0	107
RB Multifamily Investors LLC
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	$ 0	0	$ 0	2,262
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	$ 11,206		$ 11,206		$ 9,732
Income from investments in unconsolidated entities	$ 394	244	$ 1,374	702
Evergreens JV Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	85.00%		85.00%		85.00%
Carrying Amount, fair value option	$ 4,120		$ 4,120		$ 3,810
Income from investments in unconsolidated entities	$ 161	79	$ 464	89
Bent Tree JV Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	0.00%		0.00%		78.00%
Carrying Amount, fair value option	$ 0		$ 0		$ 9,890
Income from investments in unconsolidated entities	$ 1,210	157	$ 1,795	257
Summerchase LR Partners LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	0.00%		0.00%		80.00%
Carrying Amount, fair value option	$ 0		$ 0		$ 4,410
Income from investments in unconsolidated entities	$ 194	190	$ 556	200
Lake Mary Realty Partners, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	0.00%		0.00%		80.00%
Carrying Amount, fair value option	$ 0		$ 0		$ 7,690
Income from investments in unconsolidated entities	$ 2,312	238	$ 2,745	258
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	$ 12,850		$ 12,850		$ 12,280
Income from investments in unconsolidated entities	$ 440	392	$ 1,266	492
WR Savannah Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	90.00%		90.00%		90.00%
Carrying Amount, fair value option	$ 12,850		$ 12,850		$ 12,520
Income from investments in unconsolidated entities	$ 405	$ 362	$ 1,030	$ 422

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