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Related Party Transactions - Additional Information (Detail) - Employees Other Than Executive Officers [Member] - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |
Loans to related parties | $ 416.7 | $ 350.1
Maximum [Member] |  |
Related Party Transaction [Line Items] |  |
Related party transaction, rate | 5.25% |

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