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Fair Value - Additional Information (Detail)
12 Months Ended
Dec. 31, 2023
USD ($)
$ / shares
Dec. 31, 2022
USD ($)
Servicing Assets At Fair Value [Line Items]    
Servicing rights of sold loans $ 2,100,000,000 $ 2,160,000,000
Weighted average net servicing fee income, Basis points 0.283%  
Weighted average prepayment speed assumption used in the fair value 8.05%  
Weighted average discount rate 10.30%  
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 75  
Weighted average discount rate 10.00%  
Maximum [Member]    
Servicing Assets At Fair Value [Line Items]    
Estimated base annual servicing costs | $ / shares 85  
Weighted average discount rate 12.00%  
2 Corporate Bond [Member] | Level 3 [Member]    
Servicing Assets At Fair Value [Line Items]    
Purchase price $ 750,000