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Fair Value - Additional Information (Detail)
12 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
Servicing Assets At Fair Value [Line Items]    
Servicing rights of sold loans $ 1,910,000,000 $ 846,500,000
Weighted average net servicing fee income, Basis points 0.028%  
Weighted average prepayment speed assumption used in the fair value 11.65%  
Weighted average discount rate 9.29%  
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 65.00  
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 11.00%  
MSR Assets [Member]    
Servicing Assets At Fair Value [Line Items]    
Amortized cost of assets $ 16,500,000  
Fair value of assets $ 21,000,000.0