Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Weighted average interest rate of long-term debt outstanding calculated over time.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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	Dec. 31, 2022
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%
7.75% convertible senior notes \| Convertible notes
Debt Instrument [Line Items]
Debt Instrument interest rate (as a percent)				7.75%	7.75%