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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2014
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
Dec. 31, 2013
May 01, 2018
Significant Accounting Policies [Line Items]                
Risk-sharing arrangement term           10 years    
SPE, assets   $ 47,000 $ 47,000 $ 48,000        
SPE, liabilities   17,000 $ 17,000 19,000        
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     $ 600 $ 500 $ 600      
Future lease commitments with expiration date   $ 15,659 $ 15,659          
Minimum                
Significant Accounting Policies [Line Items]                
Percentage of losses assumed on pool of loans sold           1.00%    
Incentive Plan, awards vesting period (in years) 3 years              
Maximum                
Significant Accounting Policies [Line Items]                
Percentage of losses assumed on pool of loans sold           2.25%    
Incentive Plan, awards vesting period (in years) 4 years              
5 Arches, LLC                
Significant Accounting Policies [Line Items]                
Minority interest, percentage   20.00% 20.00%         20.00%
Variable Interest Entity, Primary Beneficiary                
Significant Accounting Policies [Line Items]                
VIE, ownership interest rate   80.00%