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Earnings Per Share - Calculation of Basic Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share [Abstract]                
Net income $ 4,777 $ 6,001 $ 6,466 $ 8,954 $ 8,271 $ 8,102 $ 17,244 $ 25,327
Less: distributed earnings allocated to participating securities (33)     (26)     (95) (67)
Less: undistributed earnings allocated to participating securities (20)     (42)     (90) (148)
Net earnings available to common shareholders $ 4,724     $ 8,886     $ 17,059 $ 25,112
Weighted average common shares outstanding including participating securities 13,650,823     13,083,145     13,633,101 13,071,859
Less: average unvested restricted shares (152,127)     (99,838)     (146,184) (111,209)
Weighted average common shares outstanding 13,498,696     12,983,307     13,486,917 12,960,650
Basic earnings per share $ 0.35     $ 0.68     $ 1.26 $ 1.94
Diluted earnings per share $ 0.35     $ 0.68     $ 1.26 $ 1.94