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Business Purpose Loans - Classifications and Carrying Values of Business Purpose Residential Loans (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real estate amount, amount with original maturity of thirty years (as a percent)	2.00%
LIBOR
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real estate owned, rate (as a percent)	39.00%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real estate owned, rate (as a percent)	48.00%
Fixed Rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real estate owned, rate (as a percent)	13.00%
Commitment To Fund Residential Bridge Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commitment to fund loan	$ 990,000
Bridge Loans | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential bridge loans held-for-investment, original maturities (in months)	6 months
Bridge Loans | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential bridge loans held-for-investment, original maturities (in months)	36 months
Held-for-sale at fair value, Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans	$ 337,238	$ 358,309
Held-for-investment at fair value, Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans	4,919,980	4,432,680
Business Purpose Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans	5,257,218	4,790,989
Redwood | Single-family rental loans, held-for-sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans	281,105	358,309
Redwood | Single Family Rental Loans Held For Investment At Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans	0	0
Redwood | Single family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans	281,105	358,309
Redwood | Residential Bridge, Held-for-sale at fair value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans	56,133	0
Redwood | Bridge loans held-for-investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans	1,388,750	666,364
Redwood | Residential bridge loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans	1,444,883	666,364
CAFL | Single-family rental loans, held-for-sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans	0	0
CAFL | Single Family Rental Loans Held For Investment At Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans	3,018,994	3,488,074
CAFL | Single family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans	3,018,994	3,488,074
CAFL | Bridge Loans, Held-For-Sale At Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans	0	0
CAFL | Bridge Loans Held For Investment At Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans	512,236	278,242
CAFL | Bridge Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans	$ 512,236	$ 278,242

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
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