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Fair Value of Financial Instruments - Portion of Net Gains (Losses) Attributable to Level 3 Assets and Liabilities Still Held Included in Net Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Point HEI Noncontrolling Interest
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 liabilities still held included in net income	$ (6,218)	$ 0
Residential loan purchase commitments, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 liabilities still held included in net income	(14,442)	(35,661)
Point Entities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 assets still held included in net income	9,628	0
Held-for-investment at fair value | Residential loans at Redwood
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 assets still held included in net income	(35,397)	(9,978)
Held-for-investment at fair value | Sequoia
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 assets still held included in net income	(4,981)	4,201
Held-for-investment at fair value | Freddie Mac SLST
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 assets still held included in net income	2,940	4,088
Business purpose loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 assets still held included in net income	(14,647)	5,104
Multifamily loans | Freddie Mac K-Series
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 assets still held included in net income	264	8,921
Single family rental loans | CAFL
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 assets still held included in net income	4,048	370
Trading Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 assets still held included in net income	(1,401)	490
Servicer Advance Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 assets still held included in net income	(3,081)	(160)
MSRs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 assets still held included in net income	3,526	756
Excess MSRs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 assets still held included in net income	(1,208)	(1,952)
HEIs at Redwood
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 assets still held included in net income	1,185	5,315
Residential loan purchase commitments, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 assets still held included in net income	$ 2,050	$ 1,053

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