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Business Purpose Loans - Activity and Characteristics of Business Purpose Loans (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023 USD ($) loan	Mar. 31, 2022 USD ($)	Jun. 30, 2022 USD ($) loan	Dec. 31, 2022 USD ($) loan
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Purchases of held-for-sale loans	$ 55,824	$ 2,197,570
Principal balance of loans sold to third parties	255	23,050
Fair value of loans transferred	873,093	1,098,459
Single-family rental loans, held-for-sale | Redwood
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Purchases of held-for-sale loans	174,078	442,727
Principal balance of loans acquired	3,815	61,892
Principal balance of loans sold to third parties	217,702	331,502
Fair value of loans transferred	0	0
Gain (loss) on investments	0	0
Fair value of loans	354,166			$ 358,791
Single-family rental loans, held-for-sale | Redwood | Total residential mortgage banking activities, net
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Gain (loss) on investments	12,666	(24,468)
Business Purpose loans held-for-investment | Redwood
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Purchases of held-for-sale loans	255,152	411,938
Principal balance of loans acquired	9,085	2,983
Principal balance of loans sold to third parties	12,547	0
Fair value of loans transferred	80,792	82,291
Gain (loss) on investments	1,609	(759)
Fair value of loans	1,616,610			1,507,146
Business Purpose loans held-for-investment | Redwood | Total residential mortgage banking activities, net
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Gain (loss) on investments	1,162	2,375
Business Purpose Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Fair value of loans	5,364,649			5,332,586
Single Family Rental Loans Held For Investment At Fair Value | Redwood
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Fair value of loans	0			0
Single Family Rental Loans Held For Investment At Fair Value | CAFL
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Gain (loss) on investments	$ 37,179	(191,903)
Number of loans | loan	1,094		1,131
Unpaid principal balance	$ 3,172,026			3,263,421
Fair value of loans	$ 2,891,043			$ 2,944,984
Weighted average coupon rate (as a percent)	5.21%			5.22%
Weighted average remaining loan term (years)	5 years		6 years
Fair value of loans with 90+ day delinquencies	$ 9,378			$ 13,686
Number of loans in foreclosure | loan	8			9
Single Family Rental Loans Held For Investment At Fair Value | CAFL | Financing Receivables, Equal to Greater than 90 Days Past Due
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of loans with 90+ day delinquencies | loan	19			16
Fair value of loans with 90+ day delinquencies	$ 60,740			$ 37,072
Bridge Loans Held For Investment At Fair Value | CAFL
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Gain (loss) on investments	$ (592)	$ (1,384)
Single-Family Rental Loans, Held-For-Sale | Redwood
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of loans | loan	94		91
Unpaid principal balance	$ 349,190			389,846
Fair value of loans	$ 354,166			$ 358,791
Weighted average coupon rate (as a percent)	6.98%			5.98%
Weighted average remaining loan term (years)	9 years		10 years
Fair value of loans with 90+ day delinquencies	$ 536			$ 536
Number of loans in foreclosure | loan	1			1
Unpaid principal balance of loans in foreclosure	$ 536			$ 536
Single-Family Rental Loans, Held-For-Sale | Redwood | Loans Pledged As Collateral, Short Term Debt
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Gain (loss) on investments	345,080		$ 291,406
Single-Family Rental Loans, Held-For-Sale | Redwood | Loans Pledged As Collateral, Long Term debt
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Gain (loss) on investments	0		$ 66,567
Single-Family Rental Loans, Held-For-Sale | Redwood | Financing Receivables, Equal to Greater than 90 Days Past Due
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Fair value of loans	$ 1,157			$ 536
Number of loans with 90+ day delinquencies | loan	2			1
Fair value of loans with 90+ day delinquencies	$ 1,566			$ 536
Business Purpose Bridge Loans | Redwood
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of loans | loan	1,473		1,601
Unpaid principal balance	$ 1,636,460			1,518,427
Fair value of loans	$ 1,633,829			$ 1,512,428
Weighted average coupon rate (as a percent)	10.20%			9.61%
Weighted average remaining loan term (years)	1 year		2 years
Fair value of loans with 90+ day delinquencies	$ 31,446			$ 34,039
Number of loans in foreclosure | loan	52			48
Unpaid principal balance of loans in foreclosure	$ 27,308			$ 29,438
Business Purpose Bridge Loans | Redwood | Loans Pledged As Collateral, Short Term Debt
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Gain (loss) on investments	675,971		$ 579,666
Business Purpose Bridge Loans | Redwood | Loans Pledged As Collateral, Long Term debt
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Gain (loss) on investments	922,296		$ 897,782
Business Purpose Bridge Loans | Redwood | Financing Receivables, Equal to Greater than 90 Days Past Due
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Fair value of loans	$ 28,387			$ 29,663
Number of loans with 90+ day delinquencies | loan	53			49
Fair value of loans with 90+ day delinquencies	$ 32,526			$ 34,264
Business Purpose Bridge Loans | CAFL
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of loans | loan	1,796		1,875
Unpaid principal balance	$ 484,124			514,666
Fair value of loans	$ 485,611			$ 516,383
Weighted average coupon rate (as a percent)	10.41%			9.67%
Weighted average remaining loan term (years)	1 year		1 year
Fair value of loans with 90+ day delinquencies	$ 7,628			$ 7,328
Number of loans in foreclosure | loan	49			48
Unpaid principal balance of loans in foreclosure	$ 7,628			$ 7,438
Business Purpose Bridge Loans | CAFL | Financing Receivables, Equal to Greater than 90 Days Past Due
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Fair value of loans	$ 11,416			$ 7,438
Number of loans with 90+ day delinquencies | loan	51			48
Fair value of loans with 90+ day delinquencies	$ 11,416			$ 7,328

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Number of mortgage loans within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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-Publisher SEC
-Name Regulation S-X (SX)
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