Loans - Secured Loans Summarized by Payment Delinquency (Details)	Oct. 31, 2021 USD ($) MortgageLoan	Sep. 30, 2021 USD ($) MortgageLoan	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($) MortgageLoan
Loans (Details) - Secured Loans by Property Type [Line Items]
Delinquent loans, number | MortgageLoan		33		33
Past Due
Secured loans - principal (in Dollars) | $		$ 70,227,000	$ 72,548,000	$ 74,080,000
Current [Member]
Loans (Details) - Secured Loans by Property Type [Line Items]
Delinquent loans, number | MortgageLoan	1	27		30
Past Due
Secured loans - principal (in Dollars) | $	$ 7,994,000	$ 53,800,000		$ 58,941,000
Past Due 30-89 Days [Member]
Loans (Details) - Secured Loans by Property Type [Line Items]
Delinquent loans, number | MortgageLoan		2
Past Due
Secured loans - principal (in Dollars) | $		$ 10,057,000
Past Due 180 Days or More [Member]
Loans (Details) - Secured Loans by Property Type [Line Items]
Delinquent loans, number | MortgageLoan		4		3
Past Due
Secured loans - principal (in Dollars) | $		$ 6,370,000		$ 15,139,000
Past Due [Member]
Loans (Details) - Secured Loans by Property Type [Line Items]
Delinquent loans, number | MortgageLoan		6		3
Past Due
Secured loans - principal (in Dollars) | $		$ 16,427,000		$ 15,139,000