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Operating Segments - Profit by Reportable Segment (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment									2
Segment Reporting Information [Line Items]
Revenue	$ 19,218	$ 11,937	$ 14,741	$ 13,130	$ 14,957	$ 13,231	$ 15,204	$ 15,596	$ 59,026	$ 58,988	$ 149,949
Total profit from segments	$ 3,938	$ (2,303)	$ 1,491	$ (3,238)	$ (731)	$ (578)	$ (1,013)	$ 1,932	(112)	(390)	42,878
Operating Segments
Segment Reporting Information [Line Items]
Total profit from segments									27,549	20,537	54,357
Operating Segments | Multifamily Segment
Segment Reporting Information [Line Items]
Revenue									14,686	13,517	80,821
Operating expenses									(8,482)	(9,304)	(42,778)
Profit from segment									6,204	4,213	38,043
Operating Segments | Commercial Segment
Segment Reporting Information [Line Items]
Revenue									37,223	32,714	33,123
Operating expenses									(15,878)	(16,390)	(16,809)
Profit from segment									$ 21,345	$ 16,324	$ 16,314

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