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Mortgage Banking and Investment Activities, Net - Components of Mortgage Banking Activities (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Hedging allocation | $ 0 |  | $ 0 |
Total investment activities | (14,169) | $ (3,749) | (17,105) | $ (14,020)
Mortgage banking and investment activities | (12,836) | 14,166 | (6,399) | 9,984
Residential Mortgage Banking Activities |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Other income | 1,177 | 1,082 | 3,209 | 1,871
Mortgage banking activities | 331 | 11,429 | 7,383 | 11,704
Hedging allocation | (1,683) | 0 | 1,120 | 0
Residential Mortgage Banking Activities | Residential loans, at fair value |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Changes in fair value of assets | 36,183 | 15,976 | 54,375 | 40,685
Residential Mortgage Banking Activities | Real estate securities |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Changes in fair value of assets | 0 | (1,332) | (14,359) | (14,419)
Residential Mortgage Banking Activities | Risk managment derivatives |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Changes in fair value of risk management derivatives | (35,346) | (4,297) | (36,962) | (16,433)
Commercial Mortgage Banking Activities |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Other income | 109 | 289 | 336 | 382
Mortgage banking activities | 1,002 | 6,486 | 3,323 | 12,300
Commercial Mortgage Banking Activities | Risk managment derivatives |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Changes in fair value of risk management derivatives | (3,081) | 1,892 | (7,832) | (1,726)
Commercial Mortgage Banking Activities | Commercial loans, at fair value |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Changes in fair value of assets | 3,974 | 4,305 | 10,819 | 13,644
Investment Activities |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Changes in fair value of risk management derivatives | (14,321) | (1,632) | (15,266) | (10,986)
Hedging allocation | 1,683 | 0 | (1,120) | 0
Investment Activities | Real estate securities |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Changes in fair value of assets | (9,010) | (765) | (1,813) | (1,218)
Investment Activities | Net investments in consolidated Sequoia entities |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Changes in fair value of assets | (500) | (361) | (2,277) | (825)
Investment Activities | Residential loans held-for-investment, at Redwood |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Changes in fair value of assets | 9,077 | (991) | 5,170 | (991)
Investment Activities | Risk sharing investments |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Changes in fair value of assets | $ (1,098) | $ 0 | $ (1,799) | $ 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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