Loans - Secured Loans Summarized by Payment Delinquency (Details)	Feb. 28, 2022 USD ($)	Dec. 31, 2021 USD ($) MortgageLoan	Dec. 31, 2020 USD ($) MortgageLoan	Dec. 31, 2019 USD ($)
Loans (Details) - Secured Loans by Property Type [Line Items]
Delinquent loans, number | MortgageLoan | MortgageLoan		31	33
Past Due
Secured loans - principal (in Dollars) | $		$ 55,099,000	$ 74,080,000	$ 86,203,000
Current [Member]
Loans (Details) - Secured Loans by Property Type [Line Items]
Delinquent loans, number | MortgageLoan | MortgageLoan		25	30
Past Due
Secured loans - principal (in Dollars) | $	$ 402,000	$ 48,274,000	$ 58,941,000
Past Due 30-89 Days [Member]
Loans (Details) - Secured Loans by Property Type [Line Items]
Delinquent loans, number | MortgageLoan | MortgageLoan		2	0
Past Due
Secured loans - principal (in Dollars) | $		$ 5,782,000	$ 0
Past Due 90-179 Days [Member]
Loans (Details) - Secured Loans by Property Type [Line Items]
Delinquent loans, number | MortgageLoan | MortgageLoan		1	0
Past Due
Secured loans - principal (in Dollars) | $		$ 56,000	$ 0
Past Due 180 Days or More [Member]
Loans (Details) - Secured Loans by Property Type [Line Items]
Delinquent loans, number | MortgageLoan | MortgageLoan		3	3
Past Due
Secured loans - principal (in Dollars) | $		$ 987,000	$ 15,139,000
Past Due [Member]
Loans (Details) - Secured Loans by Property Type [Line Items]
Delinquent loans, number | MortgageLoan | MortgageLoan		6	3
Past Due
Secured loans - principal (in Dollars) | $		$ 6,825,000	$ 15,139,000