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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
 1 Months Ended 12 Months Ended 24 Months Ended
May 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2014
Dec. 31, 2015
Significant Accounting Policies [Line Items]            
Risk-sharing arrangement term           10 years
SPE, assets   $ 34,000,000 $ 46,000,000      
SPE, liabilities   $ 7,000,000 10,000,000      
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   $ 1,200,000 1,100,000 $ 700,000    
Notional Amount   6,861,921,000 11,346,407,000      
Borrowings   1,650,576,000 1,441,331,000      
Interest Rate Contract            
Significant Accounting Policies [Line Items]            
Notional Amount   2,100,000,000 1,630,000,000      
Trust Preferred Securities and Subordinated Notes            
Significant Accounting Policies [Line Items]            
Borrowings   139,500,000 $ 139,500,000      
Repo or Warehouse Debt            
Significant Accounting Policies [Line Items]            
Borrowings   2,470,000,000        
Bridge Loan            
Significant Accounting Policies [Line Items]            
Borrowings   $ 708,000,000        
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