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Earnings Per Share - Calculation of Basic Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]                      
Net income $ 3,193 $ 3,875 $ 4,114 $ 3,767 $ 3,436 $ 3,222 $ 3,223 $ 2,839 $ 14,949 $ 12,720 $ 11,664
Less: distributed earnings allocated to participating securities                 (52) (45) (37)
Less: undistributed earnings allocated to participating securities                 (98) (77) (64)
Net earnings available to common shareholders                 $ 14,799 $ 12,598 $ 11,563
Weighted average common shares outstanding including participating securities                 9,272,964 9,250,825 9,224,230
Less: average unvested restricted shares                 (93,000) (88,664) (79,964)
Weighted average common shares outstanding 9,285,261 9,274,507 9,265,898 9,265,959 9,266,584 9,252,919 9,241,750 9,241,750 9,179,964 9,162,161 9,144,266
Basic earnings and diluted per share $ 0.34 $ 0.42 $ 0.44 $ 0.41 $ 0.37 $ 0.35 $ 0.35 $ 0.31 $ 1.61 $ 1.38 $ 1.27