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Summary of Significant Accounting Policies - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease [Abstract] |  |  |
Net unrealized gain (loss) on available-for-sale securities | $ 5,179 | $ (1,058) | $ 267
Reclassification adjustment for (gain) loss on sale of available-for-sale securities | 26 | 9 | (47)
Net unrealized gain (loss) on available-for-sale securities | 5,205 | (1,049) | 220
Tax expense (benefit) | 1,093 | (220) | 74
Other comprehensive income (loss) | $ 4,112 | $ (829) | $ 146

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