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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Measurement Input [Extensible List] us-gaap:MeasurementInputComparabilityAdjustmentMember      
Historical recovery rate of collateral values of consumer installment loans 66.00%      
Residential Mortgage Loans [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Capitalized servicing rights $ 241,053 $ 231,204 $ 244,411 $ 120,509
Capitalized servicing rights, valuation allowance $ (24,000) (30,000) (7,000)  
Weighted-average prepayment speeds 12.92%      
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 $ 53,000 222,000 110,000  
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 138,000 159,000    
Capitalized servicing rights, valuation allowance 24,000 30,000    
Valuation Charge Recognized $ (6,000) $ 23,000 7,000  
Weighted-average prepayment speeds 14.64% 16.01%    
Discounted rate represented weighted-average option-adjusted basis spread point percentage 900.00% 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 $ 574,000 $ 652,000 305,000  
Assets taken in foreclosure of defaulted loans measured at fair value on a nonrecurring basis 3,000 22,000    
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 340,000 339,000 115,000  
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 $ 234,000 $ 313,000 $ 190,000