Manager and Other Related Parties - Additional Information (Details)		1 Months Ended	12 Months Ended
		Mar. 31, 2022 USD ($) MortgageLoan	Dec. 31, 2021 USD ($) MortgageLoan MortageLoan	Dec. 31, 2020 USD ($) MortageLoan MortgageLoan	Dec. 31, 2019 USD ($)
Managers and Other Related Parties (Details) [Line Items]
Managers Share of net income or loss			1.00%
Liquidation offering proceeds, percentage			7.00%
Loan Brokerage Commissions, Maximum Percent of Assets			4.00%
Revenue, Remaining Performance Obligation, Amount			$ 3,388,000
Formation loan advances to RMC			5,627,000
Future redemptions of member's capital			$ 2,100,000
Percentage of reimbursement of organization and offering expenses			4.50%
Reimbursement as a percentage of member's original purchase price			0.45%
Percentage of original purchase price, quarterly installment percentage			0.1125%
Payable to related parties			$ 101,000	$ 4,000
Receivables from manager			$ 67,000	$ 2,000
Mortgage Loans On Real Estate Number Of Loans | MortgageLoan		1	54	82
Total principal, secured loans		$ 586,000	$ 81,097,000	$ 82,275,000	$ 70,660,000
Repayment of promissory notes receivable from related parties			405,000	119,000
Promissory note payable			6,000
Early withdrawal penalties	[1]		16,000	14,000
Redwood Mortgage Investors VIII [Member]
Managers and Other Related Parties (Details) [Line Items]
Total cost			$ 220,000	$ 146,000
One Performing Loan [Member]
Managers and Other Related Parties (Details) [Line Items]
Mortgage Loans On Real Estate Number Of Loans | MortageLoan				1
Total principal, secured loans				$ 237,000
Two Performing Loan [Member]
Managers and Other Related Parties (Details) [Line Items]
Mortgage Loans On Real Estate Number Of Loans | MortageLoan				2
Total principal, secured loans				$ 2,997,000
Five Performing Loan [Member]
Managers and Other Related Parties (Details) [Line Items]
Mortgage Loans On Real Estate Number Of Loans | MortageLoan			5
Total principal, secured loans			$ 2,560,000
Five Performing Loan [Member] | Mortgage Loans [Member]
Managers and Other Related Parties (Details) [Line Items]
Total principal, secured loans			4,672,000
Accounts Payable and Cost Reimbursements [Member]
Managers and Other Related Parties (Details) [Line Items]
Payable to related parties			$ 168,000
Maximum [Member]
Managers and Other Related Parties (Details) [Line Items]
Annual mortgage servicing fees, percentage			0.25%
Reimbursement threshold			For each of forty (40) calendar quarters or portion thereof after December 31, 2015
Early withdrawal penalties			$ 111,000
RMC [Member]
Managers and Other Related Parties (Details) [Line Items]
Management Fee, Percentage			0.75%
Administrative Fees, Percentage			1.00%
Working Capital Reserve, Percentage			2.00%
Loan Brokerage Commission Percent Minimum			1.50%
Loan Brokerage Commission Percent Maximum			5.00%
Repayment of formation loan in annual installments			$ 208,000
Future redemptions of member's capital			4,861,000	3,270,000
Qualifying costs incurred			645,000	598,000
Reimbursement of costs			425,000	452,000
Loan Brokerage Commission			928,000	1,100,000
Early withdrawal penalties			35,000	31,000
Administrative Fees Chargeable			492,000	518,000
RMC [Member] | Accounts Payable and Cost Reimbursements [Member]
Managers and Other Related Parties (Details) [Line Items]
Payable to related parties			$ 101,000
RMC [Member] | Accounts Payable Related to Mortgage Fund [Member]
Managers and Other Related Parties (Details) [Line Items]
Payable to related parties				$ 4,000

[1] The O&O expenses component of early withdrawal penalties are applied as a reduction to O&O expenses to be repaid by RMC to members’ capital on scheduled redemptions. The amounts credited are determined by the ratio between the amount of the formation loan and the amount of offering costs incurred by the company.