Investment in Unconsolidated Affiliates - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
SE Savage, LLC | First Mortgage
Investment in Unconsolidated Affiliates
Mortgage balance	$ 30,829	$ 26,210
SE Savage, LLC | Second Mortgage
Investment in Unconsolidated Affiliates
Mortgage balance		6,129
SE Savage, LLC | Promissory Note
Investment in Unconsolidated Affiliates
Face amount of debt	1,397
SE Maple Grove, LLC | First Mortgage
Investment in Unconsolidated Affiliates
Mortgage balance	24,788	24,788
SE Maple Grove, LLC | Second Mortgage
Investment in Unconsolidated Affiliates
Mortgage balance	3,643	727
SE Rogers
Investment in Unconsolidated Affiliates
Assets of unconsolidated investee	32,516	22,847
Mortgage balance	15,348
SE Rogers | First Mortgage
Investment in Unconsolidated Affiliates
Mortgage balance	25,742	15,688
ST Oak Cliff, LLC
Investment in Unconsolidated Affiliates
Assets of unconsolidated investee	32,608	7,394
Mortgage balance		0
SE Brooklyn Park, LLC
Investment in Unconsolidated Affiliates
Assets of unconsolidated investee	27,382	5,478
SE Brooklyn Park, LLC | First Mortgage
Investment in Unconsolidated Affiliates
Mortgage balance	20,007	0
Sterling Properties LLLP | Second Mortgage
Investment in Unconsolidated Affiliates
Mortgage balance	2,216
SE Fossil Creek, LLC
Investment in Unconsolidated Affiliates
Assets of unconsolidated investee	$ 8,272
Operating Partnership | Banner Building
Investment in Unconsolidated Affiliates
Ownership interest (as a percent)	66.67%
Mortgage balance	$ 6,951	6,329
Operating Partnership | Grand Forks Market Place Retail Center
Investment in Unconsolidated Affiliates
Ownership interest (as a percent)	50.00%
Percentage of interest	100.00%
Mortgage balance	$ 9,606	$ 9,794
Operating Partnership | SE Savage, LLC
Investment in Unconsolidated Affiliates
Ownership interest (as a percent)	60.00%
Operating Partnership | SE Maple Grove, LLC
Investment in Unconsolidated Affiliates
Ownership interest (as a percent)	60.00%
Operating Partnership | SE Rogers
Investment in Unconsolidated Affiliates
Ownership interest (as a percent)	60.00%
Operating Partnership | ST Oak Cliff, LLC
Investment in Unconsolidated Affiliates
Ownership interest (as a percent)	70.00%
Operating Partnership | SE Brooklyn Park, LLC
Investment in Unconsolidated Affiliates
Ownership interest (as a percent)	60.00%
Cash contribution	$ 3,042
Operating Partnership | Sterling Properties LLLP
Investment in Unconsolidated Affiliates
Cash contribution	$ 4,939
Operating Partnership | SE Fossil Creek, LLC
Investment in Unconsolidated Affiliates
Ownership interest (as a percent)	70.00%
Cash contribution	$ 4,664