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Commitments and Contingencies - Additional Information (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Jul. 15, 2010
Plaintiff
Sep. 30, 2015
USD ($)
lease
Sep. 30, 2015
USD ($)
loan
lease
repurchase_request
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Loss Contingencies [Line Items]          
Number of noncancelable leases | lease   9 9    
Operating lease expiration dates     2021    
Future lease commitments with expiration date   $ 10,927 $ 10,927    
Operating lease expense     $ 2,000 $ 2,000  
Risk-sharing arrangement term (years)     10 years    
Special Purpose Entities (SPEs) assets   36,000 $ 36,000   $ 19,000
Special Purpose Entities (SPEs) liabilities   16,000 16,000   7,000
Residential repurchase reserve   5,768 $ 5,768   3,724
Residential repurchase requests | repurchase_request     69    
Residential repurchase, number of loans repurchased | loan     1    
Residential repurchase provisions recorded   1,000 $ 2,000    
Aggregate amount of loss contingency reserves   2,000 2,000   $ 2,000
Schwab          
Loss Contingencies [Line Items]          
Number of other named defendants along with SRF | Plaintiff 26        
Guarantee Obligations          
Loss Contingencies [Line Items]          
Unpaid principal amount on loans   $ 1,800,000 $ 1,800,000    
Weighted average original Fair Isaac Corporation (FICO) score   760 760    
Weighted average original loan-to-value (LTV)   76.00% 76.00%    
Potential future payments on loans   $ 19,000 $ 19,000    
Guarantee Obligations | Financing Receivables, Equal To Greater Than 30 Days Past Due          
Loss Contingencies [Line Items]          
Percent of loans in reference portfolio that are past due     100000000.00%    
Guarantee Obligations | Financing Receivables, Equal to Greater than 90 Days Past Due          
Loss Contingencies [Line Items]          
Percent of loans in reference portfolio that are past due     100000000.00%    
Residential | Sequoia | FHLB Seattle          
Loss Contingencies [Line Items]          
Statutory interest rate per annum   8.00% 8.00%    
Original principal amount of securities   $ 133,000 $ 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 15,000    
Principal balance of securities   13,000 13,000    
Debt instrument interest amount   1,000 1,000    
Other income          
Loss Contingencies [Line Items]          
Fee income from risk sharing agreement   1,000 1,000    
Mortgage banking and investment activities          
Loss Contingencies [Line Items]          
Market valuation changes in fair value of guarantee asset (less than for three months ending June 30, 2015)   $ (1,000) $ (2,000)    
Minimum          
Loss Contingencies [Line Items]          
Percentage of losses assumed on pool of loans sold   1.00%      
Maximum          
Loss Contingencies [Line Items]          
Percentage of losses assumed on pool of loans sold   2.25%