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Long-Term Debt - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2023
Recourse Subordinate Securities Financing Receivable | Redwood
Debt Instrument [Line Items]
Long-term debt, weighted average interest rate, over time			4.21%
Recourse Subordinate Securities Financing Receivable | Redwood | CAFL | Affiliated Entity
Debt Instrument [Line Items]
Long-term debt, weighted average interest rate, over time	4.75%	4.21%
Recourse Subordinate Securities Financing Receivable | Redwood | October 2022 through September 2023
Debt Instrument [Line Items]
Long-term debt, weighted average interest rate, over time			5.71%
Recourse Subordinate Securities Financing Receivable | Redwood | October 2023 through September 2024
Debt Instrument [Line Items]
Long-term debt, weighted average interest rate, over time			7.21%
Recourse Subordinate Securities Financing Receivable | Redwood | March 2023 through February 2024 | CAFL | Affiliated Entity
Debt Instrument [Line Items]
Long-term debt, weighted average interest rate, over time		5.71%
Recourse Subordinate Securities Financing Receivable | Redwood | March 2024 through February 2025 | CAFL | Affiliated Entity
Debt Instrument [Line Items]
Long-term debt, weighted average interest rate, over time		7.21%
Recourse Subordinate Securities Financing Receivable | Redwood | July 2024 through June 2025 | CAFL | Affiliated Entity
Debt Instrument [Line Items]
Long-term debt, weighted average interest rate, over time	6.25%
Recourse Subordinate Securities Financing Receivable | Redwood | July 2025 to June 2026 | CAFL | Affiliated Entity
Debt Instrument [Line Items]
Long-term debt, weighted average interest rate, over time	7.75%
Recourse Revolving Debt Facility | Facilities
Debt Instrument [Line Items]
Limit				$ 50,000,000
Recourse Revolving Debt Facility | Facilities | SOFR
Debt Instrument [Line Items]
Debt Instrument interest rate (as a percent)				3.25%

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