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Employee Benefits - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Bank-Owned Life Insurance |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Cash surrender value | $ 51.7 |  |
Section 401(k) Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Percent of participant contributions (percent) | 75.00% |  |
Percent of employer contribution (up to, percent) | 8.00% |  |
Contributions | $ 2.4 | $ 2.0 | $ 1.9

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- Details
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- Details
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