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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended 24 Months Ended
Dec. 31, 2020
May 31, 2020
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2013
Dec. 31, 2015
Significant Accounting Policies [Line Items]                  
VIE, ownership interest rate       80.00%          
Risk-sharing arrangement term                 10 years
SPE, assets $ 46,000   $ 46,000   $ 46,000 $ 48,000      
SPE, liabilities 10,000   $ 10,000   $ 10,000 14,000      
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         $ 1,100 $ 700 $ 600    
Cash Based Retention Award                  
Significant Accounting Policies [Line Items]                  
Cash based retention awards granted       $ 8,000          
Cash based retention awards, term     3 years 3 years          
Cash Based Retention Award | Certain Executives and Non-Executive Employees                  
Significant Accounting Policies [Line Items]                  
Cash based retention awards granted       $ 2,000          
Long Term Relative TSR Performance Vesting Cash Awards                  
Significant Accounting Policies [Line Items]                  
Cash based retention awards, service period       3 years          
Cash-Settled Deferred Stock Units                  
Significant Accounting Policies [Line Items]                  
Cash based retention awards granted $ 2,000   $ 2,000   $ 2,000        
Cash based retention awards, term 4 years                
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