Loans - Schedule of Payments in Arrears Past Due Financing Receivables (parenthetical) (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2022 MortgageLoan	Dec. 31, 2021 MortgageLoan	Mar. 31, 2022 Loan	Mar. 31, 2022 USD ($)		Dec. 31, 2021 Loan	Dec. 31, 2021 USD ($)
Loans (Details) [Line Items]
Monthly payments, interest				$ 48,000			$ 63,000
Number of secured loans with prepaid interest | MortgageLoan	44	54
Number of loans	0	0	44			54
Principal				64,293,000			81,097,000
Past Due 180 Or More Days [Member]
Loans (Details) [Line Items]
Monthly payments, interest				48,000	[1]		92,000	[2]
Number of loans | Loan			2			2
Principal				1,228,000			886,000
30-89 days [Member]
Loans (Details) [Line Items]
Monthly payments, interest				3,000	[1]		33,000	[2]
Past Due 90-179 Days [Member]
Loans (Details) [Line Items]
Monthly payments, interest				0	[1]		0	[2]
Current [Member]
Loans (Details) [Line Items]
Number of loans | Loan			38			47
Principal				$ 58,691,000			$ 72,116,000

[1] Interest includes foregone interest of approximately $48,000 on non-accrual loans for monthly payments in arrears. March 2022 interest is due April 1, 2022 and is not included in the payments in arrears at March 31, 2022.

[2] 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.