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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract] |  |
Unrealized gains (losses) on available for sale securities, income tax (benefit) expense | $ 157 | $ 129
Unrealized gain on interest rate swaps, income tax expense | $ 419 | $ 196

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- Definition Accumulated Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax + References No definition available. + Details
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