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Commitments and Contingencies - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Jul. 15, 2010
Plaintiff
Dec. 31, 2015
USD ($)
lease
repurchase_request
Dec. 31, 2014
USD ($)
loan
repurchase_request
Dec. 31, 2013
USD ($)
Loss Contingencies [Line Items]        
Number of non-cancelable leases | lease   9    
Lease expiration year   2021    
Future lease commitments with expiration date   $ 10,254    
Operating lease expense   3,000 $ 3,000 $ 2,000
Unamortized leasehold improvements (less than)   1,000    
Leasehold amortization expense (less than)   1,000 1,000 1,000
Residential loans repurchase reserve   $ 6,403 $ 3,724  
Residential loans repurchase requests | repurchase_request   79 0  
Residential loans, number of loans repurchased | loan     1  
Residential loans repurchased during period     $ 61  
Residential loans repurchase provision   $ (3,000) 2,000 $ 2,000
Aggregate amount of loss contingency reserves   2,000 2,000  
Schwab        
Loss Contingencies [Line Items]        
Number of other named defendants along with SRF | Plaintiff 26      
Residential Loans at Lower of Cost or Fair Value        
Loss Contingencies [Line Items]        
Principal amount outstanding on loans securitized   2,000 $ 2,000  
Other Income        
Loss Contingencies [Line Items]        
Fee income from risk sharing agreement   3,000    
Mortgage Banking And Investment Activities        
Loss Contingencies [Line Items]        
Market valuation changes in fair value of guarantee asset   (2,000)    
Guarantee Obligations        
Loss Contingencies [Line Items]        
Original principal balance of loans sold subject to risk sharing agreement   2,910,000    
Potential future payments on risk sharing agreements   39,000    
Principal amount outstanding on loans securitized   $ 2,710,000    
FICO credit score   758    
Loan to value ratio   76.00%    
Guarantee Obligations | Financing Receivables, Equal To Greater Than 30 Days Past Due [Member]        
Loss Contingencies [Line Items]        
Loans past due   $ 11,000    
Guarantee Obligations | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]        
Loss Contingencies [Line Items]        
Loans past due   $ 1,000    
Residential | Sequoia | FHLB Seattle        
Loss Contingencies [Line Items]        
Statutory interest rate per annum   8.00%    
Original principal amount of securities   $ 133,000    
Debt instrument principal payment amount   120,000    
Debt instrument interest payment amount   11,000    
Residential | Sequoia | Schwab        
Loss Contingencies [Line Items]        
Original principal amount of securities   15,000    
Principal balance of securities   13,000    
Debt instrument interest amount   $ 1,000