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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended |
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Mar. 31, 2020 | Jan. 01, 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 |
Adjustment of transition reserve for loans | 41,000 |
Increase in provision for credit loses | $ 12,000,000 |

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