Preferred Equity Investments and Investments in Unconsolidated Real Estate Joint Ventures (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 89,033	$ 71,145
Alexan CityCentre [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	11,205	9,258
Alexan Southside Place [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	22,801	20,584
Arlo, formerly West Morehead [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	14	14
Cade Boca Raton, formerly APOK Townhomes [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	7	7
Domain at The One Forty, formerly Domain [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	12	12
Flagler Village [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	44	30
Helios [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	19,189	16,360
Leigh House, formerly Lake Boone Trail [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	13,319	11,930
North Creek Apartments [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	5,892	0
Novel Perimeter, formerly Crescent Perimeter [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	12	12
Riverside Apartments [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	3,600	0
Vickers Historic Roswell, formerly Vickers Village [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	6	6
Whetstone [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	12,932	12,932
Wayforth at Concord [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 0	$ 0