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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
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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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