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Earnings Per Share - Calculation of Basic Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Earnings Per Share [Abstract] |  |
Net income | $ 4,909 | $ 4,105
Less: distributed earnings allocated to participating securities | (15) | (13)
Less: undistributed earnings allocated to participating securities | (23) | (18)
Net earnings available to common shareholders | $ 4,871 | $ 4,074
Weighted average common shares outstanding including participating securities | 11,197,012 | 11,134,870
Less: average unvested restricted shares | (86,595) | (84,732)
Weighted average common shares outstanding | 11,110,417 | 11,050,138
Basic and diluted earnings per share | $ 0.44 | $ 0.37

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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1337-109256 + Details
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