Loans - Non - Performing Secured Loan, Principal By LTV And Lien Position (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)	[1]
Financing Receivable, Credit Quality Indicator [Line Items]
First trust deeds	$ 51,843
First trust deeds, percent	95.00%
Second trust deeds, percent	5.00%
Total principal	$ 54,589
Total principal, percent	100.00%
Secured Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
First Trust Deed Count	12
Second trust deeds	$ 2,746
Second Trust Deed Count	2
Less Than 40% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
First trust deeds	$ 12,984
First trust deeds, percent	23.80%
Second trust deeds, percent	2.70%
Total principal	$ 14,484
Total principal, percent	26.50%
Less Than 40% [Member] | Secured Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
First Trust Deed Count	2
Second trust deeds	$ 1,500
Second Trust Deed Count	1
40-49% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
First trust deeds, percent	0.00%
Second trust deeds, percent	0.00%
Total principal, percent	0.00%
50-59% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
First trust deeds	$ 4,430
First trust deeds, percent	8.10%
Second trust deeds, percent	0.00%
Total principal	$ 4,430
Total principal, percent	8.10%
50-59% [Member] | Secured Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
First Trust Deed Count	2
60-69% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
First trust deeds	$ 22,594
First trust deeds, percent	41.40%
Second trust deeds, percent	2.30%
Total principal	$ 23,840
Total principal, percent	43.70%
60-69% [Member] | Secured Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
First Trust Deed Count	5
Second trust deeds	$ 1,246
Second Trust Deed Count	1
Subtotal Less Than 70% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
First trust deeds	$ 40,008
First trust deeds, percent	73.30%
Second trust deeds, percent	5.00%
Total principal	$ 42,754
Total principal, percent	78.30%
Subtotal Less Than 70% [Member] | Secured Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
First Trust Deed Count	9
Second trust deeds	$ 2,746
Second Trust Deed Count	2
70-79% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
First trust deeds	$ 11,835
First trust deeds, percent	21.70%
Second trust deeds, percent	0.00%
Total principal	$ 11,835
Total principal, percent	21.70%
70-79% [Member] | Secured Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
First Trust Deed Count	3
Subtotal Less Than 80% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
First trust deeds	$ 51,843
First trust deeds, percent	95.00%
Second trust deeds, percent	5.00%
Total principal	$ 54,589
Total principal, percent	100.00%
Subtotal Less Than 80% [Member] | Secured Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
First Trust Deed Count	12
Second trust deeds	$ 2,746
Second Trust Deed Count	2
Equal 80% [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
First trust deeds, percent	0.00%
Second trust deeds, percent	0.00%
Total principal, percent	0.00%

[1] LTV classifications in the table above are based on principal, advances and interest unpaid at September 30, 2023.