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Fair Value - Additional Information (Detail)
$ in Millions
6 Months Ended
Jun. 30, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
Servicing Assets At Fair Value [Line Items]    
Servicing rights of sold loans $ 2,150.0 $ 1,910.0
Weighted average net servicing fee income, Basis points 0.284%  
Weighted average prepayment speed assumption used in the fair value 8.05%  
Weighted average discount rate 8.82%  
Minimum [Member]    
Servicing Assets At Fair Value [Line Items]    
Estimated base annual servicing costs | $ / shares 65.00  
Base discount rate 8.50%  
Maximum [Member]    
Servicing Assets At Fair Value [Line Items]    
Estimated base annual servicing costs | $ / shares 80.00  
Base discount rate 10.50%  
15 Corporate Bonds | Level 3 [Member]    
Servicing Assets At Fair Value [Line Items]    
Purchase price $ 10.1  
6 Mortgage Backed Securities | Level 3 [Member]    
Servicing Assets At Fair Value [Line Items]    
Purchase price $ 7.7