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Fair Value - Additional Information (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
Servicing Assets At Fair Value [Line Items]    
Servicing rights of sold loans $ 2,170.0 $ 1,910.0
Weighted average net servicing fee income, Basis points 0.284%  
Weighted average prepayment speed assumption used in the fair value 7.99%  
Weighted average discount rate 9.32%  
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%  
15 Corporate Bonds | Level 3 [Member]    
Servicing Assets At Fair Value [Line Items]    
Purchase price $ 8.0  
6 Mortgage Backed Securities | Level 3 [Member]    
Servicing Assets At Fair Value [Line Items]    
Purchase price $ 7.6