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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) |  | 6 Months Ended
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Jan. 01, 2020 | Jun. 30, 2020
Summary Of Significant Accounting Policies [Line Items] |  |
Net decrease in retained earnings | $ 1,300,000 |
Transition adjustment, allowance for credit loses for loans | $ 1,800,000 | $ 1,800,000
Adjustment of transition reserve for loans |  | 41,000
Increase in provision for credit loses |  | $ 23,500,000

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