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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease [Abstract] |  |  |
Net unrealized gain (loss) on available-for-sale securities | $ 6,091 | $ 5,179 | $ (1,058)
Reclassification adjustment for (gain) loss on sale of available-for-sale securities | (270) | 26 | 9
Net unrealized gain (loss) on available-for-sale securities | 5,821 | 5,205 | (1,049)
Tax expense (benefit) | 1,222 | 1,093 | (220)
Other comprehensive income (loss) | $ 4,599 | $ 4,112 | $ (829)

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