Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2020
Summary Of Significant Accounting Policies [Line Items]
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	$ 1,000,000.0
Goodwill impairment	0
Adjustment Of Transition Reserve For Loans	41,000
Transition adjustment, allowance for credit loses for loans	1,800,000
Net decrease in retained earnings	$ 1,002,847,000	$ 875,568,000
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Summary Of Significant Accounting Policies [Line Items]
Net decrease in retained earnings			$ 1,300,000
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