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Fair Value - Additional Information (Detail)
9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
Servicing Assets At Fair Value [Line Items]    
Servicing rights of sold loans | $ $ 1,750,000,000 $ 846,500,000
Weighted average net servicing fee income, Basis points 0.281%  
Weighted average prepayment speed assumption used in the fair value 12.16%  
Weighted average discount rate 9.30%  
Minimum [Member]    
Servicing Assets At Fair Value [Line Items]    
Estimated base annual servicing costs | $ / shares 65.00  
Base discount rate 9.00%  
Maximum [Member]    
Servicing Assets At Fair Value [Line Items]    
Estimated base annual servicing costs | $ / shares 80.00  
Base discount rate 12.00%  
Paycheck Protection Program [Member]    
Servicing Assets At Fair Value [Line Items]    
Credit risk | $ $ 0  
PPP 1 [Member]    
Servicing Assets At Fair Value [Line Items]    
Loan forgiveness period 1 year 6 months  
PPP 2 [Member] | Minimum [Member]    
Servicing Assets At Fair Value [Line Items]    
Loan forgiveness period 1 year  
PPP 2 [Member] | Maximum [Member]    
Servicing Assets At Fair Value [Line Items]    
Loan forgiveness period 3 years