Loans - Secured Loans in Non-Accrual Status (Details) $ in Thousands		9 Months Ended	12 Months Ended
		Sep. 30, 2023 USD ($) MortgageLoan	Dec. 31, 2022 USD ($) MortgageLoan	Jun. 30, 2023 USD ($)
Loans Details Secured Loans In Nonaccrual Status [Line Items]
Principal		$ 54,589	$ 60,088	$ 57,292
Accrued interest		1,487	570
Non-accrual Status [Member]
Loans Details Secured Loans In Nonaccrual Status [Line Items]
Accrued interest	[1]	304	233
Total recorded investment		8,719	4,013
Foregone interest		$ 165	$ 233
Non-accrual Status [Member] | Principal [Member]
Loans Details Secured Loans In Nonaccrual Status [Line Items]
Number Of Loan | MortgageLoan		2	1
Principal		$ 8,405	$ 3,720
Non-accrual Status [Member] | Advances [Member]
Loans Details Secured Loans In Nonaccrual Status [Line Items]
Principal		$ 10	$ 60

[1] Accrued interest in the table above is the amount of interest accrued prior to the loan being placed on non-accrual status, net of any payments subsequently.