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Fair Value - Additional Information (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2023
USD ($)
$ / shares
Dec. 31, 2022
USD ($)
Servicing Assets At Fair Value [Line Items]    
Servicing rights of sold loans $ 2,150.0 $ 2,160.0
Weighted average net servicing fee income, Basis points 0.284%  
Weighted average prepayment speed assumption used in the fair value 8.15%  
Weighted average discount rate 9.81%  
Minimum [Member]    
Servicing Assets At Fair Value [Line Items]    
Estimated base annual servicing costs | $ / shares 75.00  
Base discount rate 9.50%  
Maximum [Member]    
Servicing Assets At Fair Value [Line Items]    
Estimated base annual servicing costs | $ / shares 85.00  
Base discount rate 11.50%  
10 Corporate Bonds | Level 3 [Member]    
Servicing Assets At Fair Value [Line Items]    
Purchase price $ 4.3  
6 Mortgage Backed Securities | Level 3 [Member]    
Servicing Assets At Fair Value [Line Items]    
Purchase price $ 7.5