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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Significant Accounting Policies [Line Items]        
Risk-sharing arrangement term   10 years    
Special Purpose Entities, assets   $ 63,000 $ 19,000  
Special Purpose Entities, liabilities   $ 25,000 7,000  
Incentive Plan, awards vesting period   3 years    
Incentive Plan, mandatory holding period before awards vest   3 years    
Employee Stock Purchase Plan, percentage of common stock fair value that employees can purchase   85.00%    
Employees maximum 401(k) contribution   100.00%    
Employer matching contributions   $ 800 600 $ 200
Minimum        
Significant Accounting Policies [Line Items]        
Percentage of losses assumed on pool of loans sold 1.00%      
Incentive Plan, awards vesting period   3 years    
Maximum        
Significant Accounting Policies [Line Items]        
Percentage of losses assumed on pool of loans sold 2.25%      
Incentive Plan, awards vesting period   4 years    
Accounting Standards Update 2014-13        
Significant Accounting Policies [Line Items]        
Cumulative effect adjustment - adoption of ASU 2014-13     9,728  
Accounting Standards Update 2014-13 | Cumulative Earnings        
Significant Accounting Policies [Line Items]        
Cumulative effect adjustment - adoption of ASU 2014-13     $ 9,728