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Mortgage Banking Activities, Net - Components of Mortgage Banking Activities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Other income, net | $ 2,388 | $ (114) | $ 8,357 | $ 3,979
Mortgage banking activities, net | 63,163 | 59,395 | 200,189 | 24,511
Residential Mortgage Banking Activities, Net |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Other income, net | 1,089 | (715) | 3,305 | (7,069)
Mortgage banking activities, net | 32,946 | 11,864 | 115,646 | (19,222)
Residential Mortgage Banking Activities, Net | Residential loans, at fair value |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Changes in fair value of assets | 27,862 | 12,589 | 75,496 | 19,151
Residential Mortgage Banking Activities, Net | Trading securities |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Changes in fair value of assets | 32 | 0 | (342) | 0
Residential Mortgage Banking Activities, Net | Risk management derivatives |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Risk management derivatives | 3,963 | (10) | 37,187 | (31,304)
Business Purpose Mortgage Banking Activities, Net: |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Changes in fair value of assets | 3,433 | 938 | 6,702 | (4,256)
Other income, net | 8,747 | 3,491 | 22,236 | 13,407
Mortgage banking activities, net | 30,217 | 47,531 | 84,543 | 43,733
Business Purpose Mortgage Banking Activities, Net: | Risk management derivatives |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Risk management derivatives | (424) | (89) | 930 | (21,627)
Business Purpose Mortgage Banking Activities, Net: | Single-family rental loans, at fair value |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Changes in fair value of assets | $ 18,461 | $ 43,191 | $ 54,675 | $ 56,209

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- Definition The net income attributable to mortgage banking activities. This includes market valuations related to residential and commercial loans, Sequoia IOs, and mortgage banking derivatives, as well as realized gains or losses associated with mortgage loan sales. + References No definition available. + Details
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