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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 | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Non-controlling interest in consolidated Point HEI entity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 liability | $ (396) | $ 0 | $ 0
Loan purchase and interest rate lock commitments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 liability | (503) | (577) | (1,290)
Contingent Consideration |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 liability | 0 | 0 | (3,217)
Point Entities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 asset | 614 | 0 | 0
Residential loans, held-for-investment | Residential loans at Redwood |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 asset | 5,886 | 1,138 | 67,470
Residential loans, held-for-investment | Net investments in consolidated Sequoia entities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 asset | 12,455 | (14,646) | 4,529
Residential loans, held-for-investment | Freddie Mac SLST(1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 asset | 62,124 | (21,220) | 27,225
Business purpose loans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 asset | 9,444 | 9,420 | 14,603
Multifamily securities | Freddie Mac K-Series |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 asset | 11,599 | (9,309) | 21,430
Single-family rental loans | CAFL(1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 asset | 8,198 | (37,062) | (14,681)
Trading securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 asset | 738 | (83,327) | 18,865
AFS Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 asset | 0 | (388) | 0
Servicer advance investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 asset | (926) | (8,902) | 3,001
MSRs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 asset | 629 | (17,545) | (11,957)
Excess MSRs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 asset | (8,017) | (8,302) | (3,260)
Shared home appreciation options |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 asset | 212 | (1,884) | 842
Loan purchase and interest rate lock commitments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 asset | $ 4,633 | $ 15,027 | $ 10,190

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