Loans - Secured Loans Characteristics (Details)	1 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($) MortgageLoan	Dec. 31, 2021 USD ($) Country MortgageLoan	Dec. 31, 2020 USD ($) Country MortgageLoan	Dec. 31, 2019 USD ($)
Secured Loan Transactions [Line Items]
Number of secured loans | MortgageLoan	1	54	82
Principal	$ 586,000	$ 81,097,000	$ 82,275,000	$ 70,660,000
Average secured loan - principal (in Dollars)		$ 1,502,000	$ 1,003,000
Average principal as percent of total principal		1.90%	1.20%
Average principal as percent of members’ capital, net		2.00%	1.30%
Average principal as percent of total assets		1.80%	1.20%
Largest secured loan - principal (in Dollars)		$ 6,750,000	$ 6,735,000
Largest principal as percent of total principal		8.30%	8.20%
Largest principal as percent of members’ capital, net		8.80%	8.50%
Largest principal as percent of total assets		8.20%	7.90%
Smallest secured loan - principal (in Dollars)		$ 148,000	$ 104,000
Smallest principal as percent of total principal		0.20%	0.10%
Smallest principal as percent of members’ capital, net		0.20%	0.10%
Smallest principal as percent of total assets		0.20%	0.10%
Number of California counties where security is located | Country		12	14
Largest percentage of principal in one California county		32.10%	28.20%
Prepaid interest		$ 643,000	$ 0
Prepaid Interest [Member]
Secured Loan Transactions [Line Items]
Number of secured loans | MortgageLoan		2	0
Prepaid interest		$ 643,000
Minimum [Member]
Secured Loan Transactions [Line Items]
Secured loans - interest rate (fixed)		6.80%	6.80%
Maximum [Member]
Secured Loan Transactions [Line Items]
Secured loans - interest rate (fixed)		10.00%	10.50%