Loans - Additional Information (Details)	1 Months Ended	3 Months Ended	9 Months Ended
	Oct. 31, 2021 USD ($) Loan MortgageLoan	Sep. 30, 2021 USD ($) MortgageLoan Loan	Sep. 30, 2021 USD ($) MortgageLoan Loan	Jun. 30, 2021 USD ($)	Jan. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) Loan MortgageLoan
Loans Details [Line Items]
Loans receivable, term			5 years
Secured loans - principal (in Dollars)		$ 70,227,000	$ 70,227,000	$ 72,548,000		$ 74,080,000
Matured at September 30, 2021, Loan | Loan		4	4
Loans receivable number of loans | Loan		33	33			33
Loans receivable, number of interest only loans | Loan		16	16
Loans receivable, amortization term			30 years
Mortgage loans on real estate number of loans renewed | Loan		0	5
Mortgage loans on real estate principal renewed			$ 23,035,000
Loan funded to the trust			690,000
Aggregate principal amount of loans sold to unaffiliated third party					$ 485,000
loan payments in trust balance		$ 690,000	690,000
Remaining loan payments in trust balance		52,000	52,000
Loans receivable largest loan (in Dollars)		10,200,000	10,200,000			$ 10,200,000
Loans receivable maturity date	Sep. 30, 2021
Non-performing loans		$ 14,364,000	$ 14,364,000			$ 15,139,000
Non-Performing Number Of Loans		6	6			3
Payment for non performing loan interest		$ 300,000	$ 300,000			$ 849,000
Matured at September 30, 2021, Principal		$ 8,984,000	$ 8,984,000
Delinquent loans, number | MortgageLoan		33	33			33
Past Due180 Days Or More [Member]
Loans Details [Line Items]
Secured loans - principal (in Dollars)		$ 6,370,000	$ 6,370,000			$ 15,139,000
Delinquent loans, number | MortgageLoan		4	4			3
Past Due180 Days Or More [Member] | Forbearance Agreement [Member]
Loans Details [Line Items]
Mortgage loan principal		$ 5,380,000	$ 5,380,000			$ 10,735,000
Current [Member]
Loans Details [Line Items]
Secured loans - principal (in Dollars)	$ 7,994,000	53,800,000	53,800,000			$ 58,941,000
Matured at September 30, 2021, Loan | Loan	1
Payment for non performing loan interest		$ 56,000	$ 56,000
Matured at September 30, 2021, Principal	$ 7,994,000
Delinquent loans, number | MortgageLoan	1	27	27			30
Loans receivable extended new maturity date	2022-03
Mortgage loans extended new maturity date	2022-03
Five Year Term or Less [Member]
Loans Details [Line Items]
Mortgage loan principal		$ 61,576,103	$ 61,576,103
Loans receivable number of loans | Loan		25	25
Loans receivable, percent of aggregate principal		88.00%	88.00%
Loans Receivable, Remaining Term			5 years
Interest Only [Member]
Loans Details [Line Items]
Mortgage loan principal		$ 15,821,625	$ 15,821,625
Loans receivable, percent of aggregate principal		23.00%	23.00%
Largest Loan [Member]
Loans Details [Line Items]
Loans receivable largest loan (in Dollars)		$ 10,200,000	$ 10,200,000
Loans receivable, yield of loan acquired		9.50%	9.50%
Loans receivable maturity date			Mar. 01, 2022
Construction Loans [Member]
Loans Details [Line Items]
Loans outstanding		$ 0	$ 0