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Fair Value of Financial Instruments - Market Valuation Adjustments, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	$ 10,905	$ 12,107
Mortgage servicing rights income (loss), net	4,225	1,077
Total Market Valuation Gains (Losses), Net	$ 44,020	$ 11,270
Mortgage Banking Activities, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment, Type [Extensible Enumeration]	Total Market Valuation Gains (Losses), Net	Total Market Valuation Gains (Losses), Net
Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	$ 21,837	$ (4,392)
HEI income, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	9,031	4,265
Other Income
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights income (loss), net	2,247	(710)
Residential consumer loans held-for-sale | Mortgage Banking Activities, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	2,497	6,994
Residential consumer loan purchase commitments | Mortgage Banking Activities, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(6,351)	(239)
Residential investor term loans held-for-sale | Mortgage Banking Activities, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(296)	12,700
Residential investor term loans held-for-sale | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(1,000)	0
Residential investor bridge loans | Mortgage Banking Activities, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	946	1,119
Trading securities | Mortgage Banking Activities, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	8,511	0
Trading securities | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	4,181	1,961
Risk management derivatives, net | Mortgage Banking Activities, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	5,598	(8,467)
Risk management derivatives, net | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	4,381	(8,704)
Residential consumer 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]
Changes in fair value of assets	0	183
Residential investor bridge loans held-for-investment | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(3,218)	1,376
Servicer advance investments | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(634)	(1,352)
Excess MSRs | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(1,245)	(228)
Legacy Sequoia | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(218)	(94)
Sequoia | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	7,128	2,442
Freddie Mac SLST | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	3,730	8,934
Freddie Mac K-Series | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	243	363
CAFL | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	10,251	(8,810)
Other investments | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(2,391)	(435)
Credit recoveries (losses) on AFS securities | Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	629	(28)
HEI at Redwood | HEI income, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	6,143	3,840
Net investments in HEI securitization entities | HEI income, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	2,888	425
MSRs | Other Income
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights income (loss), net	2,464	(590)
Other | Other Income
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights income (loss), net	$ (217)	$ (120)

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