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Fair Value of Financial Instruments - Market Valuation Adjustments, Net (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage servicing rights income (loss), net $ 3,549 $ 5,821 $ (6,545) $ 4,650
Total Market gains and losses, net (19,067) 15,117 (40,546) 1,787
Mortgage banking and investment activities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Market valuations gains and losses, net (14,122) 12,796 (9,945) 7,731
Mortgage banking and investment activities | Residential Loans at Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Market valuations gains and losses, net 11,010 13,489 9,892 34,608
Mortgage banking and investment activities | Consolidated Sequoia entities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Market valuations gains and losses, net (500) (361) (2,277) (825)
Mortgage banking and investment activities | Residential Loans Held for Investment        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Market valuations gains and losses, net 9,077 (991) 5,170 (991)
Mortgage banking and investment activities | Commercial Loans at Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Market valuations gains and losses, net 3,974 4,305 10,819 13,644
Mortgage banking and investment activities | Trading securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Market valuations gains and losses, net (8,783) (1,909) (15,946) (15,072)
Mortgage banking and investment activities | Risk managment derivatives        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Market valuations gains and losses, net (52,749) (4,036) (60,060) (29,145)
Mortgage banking and investment activities | Impairments on AFS securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Market valuations gains and losses, net (226) (188) (226) (565)
Mortgage banking and investment activities | Guarantee asset        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Market valuations gains and losses, net (1,297) 0 (2,081) 0
Mortgage banking and investment activities | Loan Purchase and Forward Sales Commitments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Market valuations gains and losses, net 25,173 2,487 44,482 6,077
Mortgage banking and investment activities | Other        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Market valuations gains and losses, net 199 0 282 0
MSR Income (loss), net, including risk management derivatives        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage servicing rights income (loss), net (4,945) 2,321 (30,601) (5,944)
MSR Income (loss), net, including risk management derivatives | Risk managment derivatives        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage servicing rights income (loss), net 23,551 0 1,736 0
MSR Income (loss), net, including risk management derivatives | Mortgage servicing rights        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage servicing rights income (loss), net $ (28,496) $ 2,321 $ (32,337) $ (5,944)