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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
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 | $ (2,570) | $ 420 | $ (2,550) | $ (1,334)
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 | (83) | 0 | (83) | 0
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 | 47 | 0 | 129 | 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 | 6,553 | (107) | 9,371 | (865)
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 | 2,885 | 7,700 | 11,779 | (22,802)
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 | 13,781 | 82,209 | 54,006 | (33,087)
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 | 18,810 | 21,155 | 19,829 | 17,901
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 | 555 | 2,165 | 11,330 | (11,014)
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 | 2,943 | 9,673 | 5,500 | (41,048)
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 | 1,547 | (3,549) | 3,824 | (80,358)
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 | (2,079) | 25 | (3,179) | (6,172)
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 | (235) | (2,376) | (49) | (16,798)
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 | (803) | (1,127) | (5,233) | (7,650)
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 | (41) | 2,384 | 21 | (4,286)
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 | $ 9,021 | $ 10,791 | $ 9,261 | $ 10,773

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