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Deposits - Additional Information (Detail) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Banking and Thrift [Abstract] |  |
Time deposits, $100,000 and over | $ 119.4 | $ 84.9

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- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations of $100,000 or more. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher SEC -Name Industry Guide -Number 3 -Section V -Paragraph D-E + Details
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