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Fair Value of Financial Instruments - Market Valuation Adjustments, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	$ 16,318	$ (50,893)	$ 1,275	$ (183,487)
Mortgage Banking Activities, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	15,328	6,420	37,283	(38,877)
Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	(31,430)	(57,697)	(36,153)	(151,789)
Other Income
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	(216)	384	145	7,179
Residential loans, held-for-sale, at fair value | Mortgage Banking Activities, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	(8,683)	(20,060)	(2,774)	(71,776)
Residential loan purchase commitments | Mortgage Banking Activities, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	5,864	(2,716)	8,045	(53,236)
BPL term loans held-for-sale | Mortgage Banking Activities, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	1,600	(19,325)	13,214	(83,827)
BPL term loans held-for-sale | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	0	0	(14,430)	0
BPL term loan interest rate lock commitments | Mortgage Banking Activities, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	0	19	0	(666)
BPL bridge loans | Mortgage Banking Activities, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	1,438	(9)	4,808	2,242
Trading securities | Mortgage Banking Activities, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	(482)	148	2,188	4,249
Trading securities | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	5,738	(12,668)	12,271	(34,268)
Risk management derivatives, net | Mortgage Banking Activities, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	15,591	48,363	11,802	164,137
Risk management derivatives, net | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	7,471	27,241	6,446	33,609
Residential loans held-for-investment, at Redwood (called Sequoia loans) | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	0	(6,614)	183	(18,876)
BPL bridge loans held-for-investment | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	(16,899)	2,482	(22,867)	(9,220)
Servicer Advance Investments | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	4,069	(3,905)	6,382	(10,217)
Excess MSRs | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	(1,450)	(351)	(608)	(3,779)
Legacy Sequoia | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	(215)	(328)	(319)	(1,378)
Sequoia | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	(4,256)	(10,936)	(886)	(20,644)
Freddie Mac SLST | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	(32,388)	(41,892)	(40,017)	(74,796)
Freddie Mac K-Series | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	390	316	1,138	390
CAFL | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	(3,800)	(6,585)	(1,903)	(24,365)
Point Entities | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	968	(584)	1,846	4,028
HEI at Redwood | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	9,290	(4,774)	21,598	(1,986)
Other investments | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	(414)	1,445	(4,208)	12,028
Credit losses on AFS securities, net | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	66	(544)	(33)	(2,315)
Other | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	0	0	(746)	0
Other | Other Income
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	(7)	(852)	(467)	(852)
MSRs | Other Income
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	$ (209)	$ 1,236	$ 612	$ 8,031

X

- Definition

The aggregate net change in market value for certain assets and liabilities that was included in earnings for the period. This includes changes in market values for assets and liabilities accounted for at fair value, as well as the credit portion of other-than-temporary impairments on securities available for sale, impairments on loans held-for-sale and real estate owned.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-3

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