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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 |  |

X
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- Definition Represents the minimum threshold for loans that are subject to an annual credit review process, where all aspects of the loan, including the borrower and guarantor(s) undergo review. This review process may result in changes to the internal credit risk rating of the loan. + References No definition available. + Details
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- Definition Period over which borrower has to demonstrate repayment performance in compliance with restructured terms to take loan out of nonaccrual status. + References No definition available. + Details
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