Loans - Schedule of Payments in Arrears Past Due Financing Receivables (Details)	Dec. 31, 2021 USD ($) Loan		Dec. 31, 2020 USD ($) Loan
Loans Details Secured Loans By Property Type Of Collateral [Line Items]
Monthly payments, interest	$ 63,000		$ 21,000
30-89 days [Member]
Loans Details Secured Loans By Property Type Of Collateral [Line Items]
Number of loans | Loan	1		0
Number of loans | Loan	2		1
Past maturity, principal	$ 1,050,000		$ 0
Monthly payments, principal	1,000		0
Past maturity, interest	0	[1]	0	[2]
Monthly payments, interest	33,000	[1]	2,000	[2]
Total payments	$ 1,084,000		$ 2,000
90-179 days [Member]
Loans Details Secured Loans By Property Type Of Collateral [Line Items]
Number of loans | Loan	1		1
Number of loans | Loan	0		4
Past maturity, principal	$ 930,000		$ 377,000
Monthly payments, principal	0		1,000
Past maturity, interest	0	[1]	0	[2]
Monthly payments, interest	0	[1]	146,000	[2]
Total payments	$ 930,000		$ 524,000
Past Due 180 Or More Days [Member]
Loans Details Secured Loans By Property Type Of Collateral [Line Items]
Number of loans | Loan	1		1
Number of loans | Loan	2		1
Past maturity, principal	$ 300,000		$ 1,200,000
Monthly payments, principal	4,000		0
Past maturity, interest	0	[1]	105,000	[2]
Monthly payments, interest	92,000	[1]	108,000	[2]
Total payments	$ 396,000		$ 1,413,000
Total past due [Member]
Loans Details Secured Loans By Property Type Of Collateral [Line Items]
Number of loans | Loan	3	[3]	2	[4]
Number of loans | Loan	4	[3]	6	[4]
Past maturity, principal	$ 2,280,000	[3]	$ 1,577,000	[4]
Monthly payments, principal	5,000	[3]	1,000	[4]
Past maturity, interest	0	[1],[3]	105,000	[2],[4]
Monthly payments, interest	125,000	[1],[3]	256,000	[2],[4]
Total payments	$ 2,410,000	[3]	$ 1,939,000	[4]

[1] Interest includes foregone interest of approximately $63,000 on non-accrual loans with monthly payments in arrears. December 2021 interest is due January 1, 2022 and is not included in the payments in arrears at December 31, 2021

[2] Interest includes foregone interest of $42,000 on non-accrual loans past maturity and approximately $21,000 for monthly payments in arrears. December 2020 interest is due January 1, 2021 and is not included in the payments in arrears at December 31, 2020.

[3] As of March 2022, one loan included in the table above as 30-89 days past maturity and one loan included in the table above as 180 or more days past due on monthly payments paid in full. Two loans included in the table above as 30-89 days past due on monthly payments, and one loan included in the table above as 180 or more days past due on monthly payments made at least one payment

[4] One loan with principal of approximately $137,000, which was 180 or more days past due, paid in full in January 2021 and so was not designated as non-performing at December 31, 2020, and is not included in the table above.