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Fair Value - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
Servicing Assets At Fair Value [Line Items]    
Servicing rights of sold loans | $ $ 2,160,000,000 $ 1,910,000,000
Weighted average net servicing fee income, Basis points 0.284%  
Weighted average prepayment speed assumption used in the fair value 8.17%  
Weighted average discount rate 9.43%  
Paycheck Protection Program [Member]    
Servicing Assets At Fair Value [Line Items]    
Credit risk | $ $ 0  
Minimum [Member]    
Servicing Assets At Fair Value [Line Items]    
Estimated base annual servicing costs | $ / shares 65  
Base discount rate 9.00%  
Maximum [Member]    
Servicing Assets At Fair Value [Line Items]    
Estimated base annual servicing costs | $ / shares 80  
Base discount rate 14.50%