Basis of Presentation and Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) Segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Minimum percentage of taxable income distributed to shareholders	90.00%
Income tax expense	$ 1,493,000	$ 312,000	$ 3,139,000
Number of reportable segments | Segment	2
Taxable REIT Subsidiaries [Member]
Income tax expense	$ 698,000	242,000	622,000
Deferred income tax expense (benefit)	$ 32,000	$ (28,000)	$ 87,000
Minimum [Member]
Estimated useful lives of the assets, years	5
Maximum [Member]
Estimated useful lives of the assets, years	40