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Earnings per Share - Computation of Basic EPS (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 2,025 | $ 2,998 | $ 2,969 | $ 1,869 | $ 2,274 | $ 1,949 | $ 5,958 | $ 964 | $ 9,861 | $ 11,145 | $ 6,691
Basic weighted-average shares outstanding |  |  |  |  |  |  |  |  | 11,292 | 11,029 | 10,950
Basic EPS | $ 0.18 | $ 0.26 | $ 0.26 | $ 0.17 | $ 0.21 | $ 0.18 | $ 0.54 | $ 0.09 | $ 0.87 | $ 1.01 | $ 0.61

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