Loans - Secured Loans Characteristics (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) Loan County	Dec. 31, 2021 USD ($) Loan County	Dec. 31, 2020 USD ($)
Secured Loan Transactions [Line Items]
Number of secured loans | Loan	21	31
Principal	$ 60,088	$ 55,099	$ 74,080
Average secured loan - principal (in Dollars)	$ 2,861	$ 1,777
Average principal as percent of total principal	4.80%	3.20%
Average principal as percent of partners’ capital, net of formation loan	5.30%	2.70%
Average principal as percent of total assets	4.30%	2.60%
Largest secured loan - principal (in Dollars)	$ 9,000	$ 7,994
Largest principal as percent of total principal	15.00%	14.50%
Largest principal as percent of partners’ capital, net of formation loan	16.60%	12.20%
Largest principal as percent of total assets	13.40%	11.70%
Smallest secured loan - principal (in Dollars)	$ 437	$ 56
Smallest principal as percent of total principal	0.70%	0.10%
Smallest principal as percent of partners’ capital, net of formation loan	0.80%	0.10%
Smallest principal as percent of total assets	0.70%	0.10%
Number of California counties where security is located | County	10	12
Largest percentage of principal in one California county	30.70%	32.10%
Minimum [Member]
Secured Loan Transactions [Line Items]
Secured loans - interest rate (fixed)	7.30%	7.30%
Maximum [Member]
Secured Loan Transactions [Line Items]
Secured loans - interest rate (fixed)	10.80%	10.80%