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Earnings Per Share - Calculation of Basic Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Earnings Per Share [Abstract] |  |  |  |  |  |
Net income | $ 4,983 | $ 4,909 | $ 4,804 | $ 4,105 | $ 9,892 | $ 8,909
Less: distributed earnings allocated to participating securities | (14) |  | (13) |  | (29) | (26)
Less: undistributed earnings allocated to participating securities | (23) |  | (22) |  | (46) | (40)
Net earnings available to common shareholders | $ 4,946 |  | $ 4,769 |  | $ 9,817 | $ 8,843
Weighted average common shares outstanding including participating securities | 11,191,043 |  | 11,129,341 |  | 11,194,011 | 11,132,105
Less: average unvested restricted shares | (84,125) |  | (80,062) |  | (85,353) | (82,397)
Weighted average common shares outstanding | 11,106,918 |  | 11,049,279 |  | 11,108,658 | 11,049,708
Basic and diluted earnings per share | $ 0.44 |  | $ 0.43 |  | $ 0.88 | $ 0.80

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