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Fair Value Measurements - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Weighted-average discount rates for fair value estimations 39.00%      
Historical recovery rate of collateral values of consumer installment loans 62.00%      
Residential Mortgage Loans [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Capitalized servicing rights $ 194,335,000 $ 241,053,000 $ 231,204,000 $ 244,411,000
Capitalized servicing rights, valuation allowance   (24,000,000) (30,000,000)  
Weighted-average prepayment speeds 7.27%      
Minimum [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Discount rates for fair value estimations 15.00%      
Maximum [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Discount rates for fair value estimations 90.00%      
Significant Unobservable Inputs (Level 3) [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Change in fair value of nonrecurring fair value measured loans for charge-offs and impairment reserves $ 191,000,000 53,000,000 222,000,000  
Significant Unobservable Inputs (Level 3) [Member] | Residential Mortgage Loans [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Capitalized servicing rights   138,000,000    
Capitalized servicing rights, valuation allowance 0 24,000,000    
Valuation Charge Recognized $ (24,000,000) (6,000,000) 23,000,000  
Weighted-average prepayment speeds 14.64%      
Discounted rate represented weighted-average option-adjusted basis spread point percentage 900.00%      
Fair Value, Measurements, Nonrecurring [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Loans measured at fair value on nonrecurring basis $ 853,000,000 574,000,000 652,000,000  
Fair Value, Measurements, Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Loans measured at fair value on nonrecurring basis 329,000 340,000,000 339,000,000  
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Loans measured at fair value on nonrecurring basis $ 524,000 $ 234,000,000 $ 313,000,000