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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.