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Related Party Transactions - Additional Information (Detail) - Employees Other Than Executive Officers [Member] - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Related Party Transaction [Line Items] |  |
Loans to related parties | $ 291.2 | $ 233.8
Related party transaction, rate | 3.75% |

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