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Operating Segments - Profit by Reportable Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]    
Revenues $ 11,828 $ 13,130
Total profit from segments (3,002) (3,238)
Operating segments    
Segment Reporting Information [Line Items]    
Total profit from segments 4,529 5,133
Operating segments | Multifamily Segment    
Segment Reporting Information [Line Items]    
Revenues 3,836 3,556
Operating expenses (2,123) (1,945)
Profit from segment 1,713 1,611
Operating segments | Commercial Segment    
Segment Reporting Information [Line Items]    
Revenues 6,525 7,886
Operating expenses (3,709) (4,364)
Profit from segment $ 2,816 $ 3,522