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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Jan. 01, 2020
USD ($)
Dec. 31, 2020
USD ($)
Segment
Dec. 31, 2019
USD ($)
Summary Of Significant Accounting Policies [Line Items]      
Number of operating business segments | Segment   2  
Number of days on which collection of interest on principal is no longer probable   90 days  
Period over which borrower has to demonstrate repayment performance in compliance with restructured terms to take loan out of nonaccrual status   6 months  
Number of days on which charge-offs unsecured consumer loans are recorded   120 days  
Minimum loan amount for credit review process   $ 1,000  
Goodwill impairment   0  
Adjustment Of Transition Reserve For Loans   41,000,000  
Transition adjustment, allowance for credit loses for loans $ 1,800 1,800  
Net decrease in retained earnings   $ 760,861 $ 682,692
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Net decrease in retained earnings $ 1,300    
Minimum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Number of days over which principal or interest payments are past due to consider loans, excluding PCI loans   30 days  
Number of days for which principal or interest payments on loans, excluding PCI loans remain accrual   30 days  
Maximum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Number of days for which principal or interest payments on loans, excluding PCI loans remain accrual   89 days