Property Loans, Net of Loan Loss Allowances - Summary of Outstanding Property Loans and Remaining Commitments (Details) - USD ($)		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020
Accounts Notes And Loans Receivable [Line Items]
Outstanding Balance		$ 2,000,000
Maximum Remaining Commitment		$ 119,690,203
Legacy Commons at Signal Hills [Member]
Accounts Notes And Loans Receivable [Line Items]
Date Committed		2021-01
Maturity Date	[1]	Feb. 01, 2024
Outstanding Balance		$ 1,000,000
Maximum Remaining Commitment		$ 31,233,972
Hilltop at Signal Hills [Member]
Accounts Notes And Loans Receivable [Line Items]
Date Committed		2021-01
Maturity Date	[1]	Aug. 01, 2023
Outstanding Balance		$ 1,000,000
Maximum Remaining Commitment		20,197,939
Scharbauer Flats Apartments [Member]
Accounts Notes And Loans Receivable [Line Items]
Date Committed			2020-06
Maturity Date	[1]		Jan. 01, 2023
Outstanding Balance			$ 1,667,776
Maximum Remaining Commitment		21,850,387
Centennial Crossings [Member]
Accounts Notes And Loans Receivable [Line Items]
Maximum Remaining Commitment		21,232,271
Oasis at Twin Lakes [Member]
Accounts Notes And Loans Receivable [Line Items]
Maximum Remaining Commitment		$ 25,175,634

[1] The borrower has the option to extend the maturity date up to six months.