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Mortgage Banking Activities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Other income |  | $ 19,257 | $ 13,070 | $ 12,436
Mortgage Banking Activities, Net |  | 87,266 | 59,566 | 53,908
Residential Mortgage Banking Activities, Net |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Other income |  | 1,735 | 2,567 | 2,064
Mortgage Banking Activities, Net |  | 47,743 | 59,623 | 53,908
Residential Mortgage Banking Activities, Net | Residential loans, held-for-sale 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 |  | 63,527 | 21,808 | 69,373
Residential Mortgage Banking Activities, Net | Risk management derivatives, net |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Changes in fair value of risk management derivatives |  | (17,519) | 35,248 | (17,529)
Business Purpose Mortgage Banking |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Other income |  | 16,205 | 0 | 0
Mortgage Banking Activities, Net |  | 39,523 | (57) | 0
Business Purpose Mortgage Banking | Single-family rental loans, held-for-sale |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Changes in fair value of assets |  | 17,004 | 453 | 0
Business Purpose Mortgage Banking | Risk management derivatives, net |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Changes in fair value of risk management derivatives |  | 1,796 | (510) | 0
Business Purpose Mortgage Banking | Residential bridge loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Changes in fair value of assets | $ 5,000 | $ 4,518 | $ 0 | $ 0

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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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