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Components of Mortgage Banking Activities, Net (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Mortgage Loans on Real Estate [Line Items]        
Sequoia IO securities $ (1,332) $ (1,866) $ (14,419) $ 36,399
Risk management derivatives (2,404) 442 (18,159) 51,009
Mortgage banking activities, net 17,872 (8,698) 23,950 85,562
Mortgage Banking Activities
        
Mortgage Loans on Real Estate [Line Items]        
Sequoia IO securities (1,332) (1,866) (14,419) 36,399
Loan purchase and forward sale commitments 2,487   6,077  
Net gains on commercial loan originations and sales       11,031
Mortgage banking activities, net 17,872 (8,698) 23,950 85,562
Mortgage Banking Activities | Residential Mortgage Banking Activities
        
Mortgage Loans on Real Estate [Line Items]        
Loans, at fair value 13,446 (10,804) 34,554 (17,339)
Risk management derivatives (4,297) [1] 75 [1] (16,433) [1] 48,583 [1]
Other 1,082 359 1,871 1,635
Mortgage banking activities, net 11,386 (12,236) 11,650 69,278
Mortgage Banking Activities | Commercial Mortgage Banking Activities
        
Mortgage Loans on Real Estate [Line Items]        
Loans, at fair value 4,305 3,171 13,644 2,826
Risk management derivatives 1,892 [1] 367 [1] (1,726) [1] 2,426 [1]
Other 289 [2]   382 [2] 1 [2]
Mortgage banking activities, net $ 6,486 $ 3,538 $ 12,300 $ 16,284
[1] Represents market valuation changes of derivatives that are used to manage risks associated with our accumulation of residential and commercial loans.
[2] Amounts in this line item include other fee income and the provision for repurchase expenses, presented net.