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Mortgage Banking and Investment Activities - Components of Mortgage Banking Activities (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Hedging allocation |  | $ 0 |  | $ 0 |
Total investment activities |  | (1,788) | $ (4,134) | (2,936) | $ (10,271)
Mortgage banking and investment activities | [1] | 5,659 | 2,189 | 6,437 | (4,181)
Residential Mortgage Banking Activities |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Other income |  | 1,400 | 435 | 2,035 | 790
Mortgage banking activities |  | 4,833 | 1,342 | 7,052 | 276
Hedging allocation |  | 2,803 | 0 | 2,803 | 0
Residential Mortgage Banking Activities | Residential loans, at fair value |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Changes in fair value of assets |  | (2,122) | 17,575 | 18,192 | 24,709
Residential Mortgage Banking Activities | Real estate securities |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Changes in fair value of assets |  | 0 | (8,810) | (14,359) | (13,087)
Residential Mortgage Banking Activities | Risk managment derivatives |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Changes in fair value of risk management derivatives |  | 2,752 | (7,858) | (1,619) | (12,136)
Commercial Mortgage Banking Activities |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Other income |  | 164 | 83 | 227 | 93
Mortgage banking activities |  | 2,614 | 4,981 | 2,321 | 5,814
Commercial Mortgage Banking Activities | Risk managment derivatives |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Changes in fair value of risk management derivatives |  | 1,463 | (816) | (4,750) | (3,619)
Commercial Mortgage Banking Activities | Commercial loans, at fair value |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Changes in fair value of assets |  | 987 | 5,714 | 6,844 | 9,340
Investment Activities |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Changes in fair value of risk management derivatives |  | 429 | (3,627) | (944) | (9,354)
Hedging allocation |  | (2,803) | 0 | (2,803) | 0
Investment Activities | Real estate securities |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Changes in fair value of assets |  | 6,927 | (186) | 7,197 | (453)
Investment Activities | Net investments in consolidated Sequoia entities |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Changes in fair value of assets |  | (684) | (321) | (1,777) | (464)
Investment Activities | Residential loans held-for-investment, at Redwood |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Changes in fair value of assets |  | (5,885) | 0 | (3,907) | 0
Investment Activities | Risk sharing investments |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Changes in fair value of assets |  | $ 228 | $ 0 | $ (702) | $ 0
[1] | For the three months ended June 30, 2015, there were no other-than-temporary impairments. For the three months ended June 30, 2014, other-than-temporary impairments were $2,915, of which $264 were recognized through the Income Statement and $2,651 were recognized in Accumulated Other Comprehensive Income.For the six months ended June 30, 2015, there were no other-then-temporary impairments. For the six months ended June 30, 2014, other-than-temporary impairments were $4,585, of which $377 were recognized through the Income Statement, and $4,208 were recognized in Accumulated Other Comprehensive Income.

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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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