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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) |  | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2020 | Jun. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Net decrease in retained earnings |  |  | $ 735,218,000 | $ 682,692,000
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 |  |
Revision of Prior Period, Accounting Standards Update, Adjustment [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Net decrease in retained earnings | $ 1,300,000 |  |  |

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