Loans - Secured Loans by Lien Position in the Collateral (Details) $ in Thousands		1 Months Ended	9 Months Ended	12 Months Ended
		Jun. 30, 2020 MortgageLoan	Sep. 30, 2021 USD ($) MortgageLoan	Dec. 31, 2020 USD ($) MortgageLoan	Jun. 30, 2021 USD ($)
Loans Details - Secured Loans by Lien Position in the Collateral [Line Items]
Secured loans, principal			$ 70,227	$ 74,080	$ 72,548
Liens due other lenders at loan closing (in Dollars)			15,668	15,759
Total debt (in Dollars)			85,895	89,839
Appraised property value at loan closing (in Dollars)			$ 160,410	$ 180,041
Percent of total debt to appraised values (LTV) at loan closing	[1]		56.60%	53.80%
Loans - percent			100.00%	100.00%
Number of secured loans | MortgageLoan		2	33	33
First Trust Deeds [Member]
Loans Details - Secured Loans by Lien Position in the Collateral [Line Items]
Secured loans, principal			$ 61,164	$ 64,286
Loans - percent			87.00%	87.00%
Number of secured loans | MortgageLoan			26	24
Second Trust Deeds [Member]
Loans Details - Secured Loans by Lien Position in the Collateral [Line Items]
Secured loans, principal			$ 9,063	$ 9,794
Loans - percent			13.00%	13.00%
Number of secured loans | MortgageLoan			7	9

[1] Based on appraised values and liens due other lenders at loan closing. The weighted-average loan-to-value (LTV) computation above does not take into account subsequent increases or decreases in property values following the loan closing, nor does it include decreases or increases on senior liens to other lenders.