Earnings per Common Share - Computation of Basic and Diluted Earnings per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Basic
Net income	$ 10,387	$ 11,112	$ 33,309	$ 27,279
Less allocation of earnings and dividends to participating securities	388	52	1,220	123
Net income available to common shareholders—basic	$ 9,999	$ 11,060	$ 32,089	$ 27,156
Weighted average common shares outstanding	15,735,007	15,394,898	15,747,648	14,974,862
Less average participating securities	588,715	71,604	576,902	67,323
Weighted average number of shares outstanding used in the calculation of basic earnings per common share	15,146,292	15,323,294	15,170,746	14,907,539
Earnings per common share:
Basic	$ 0.66	$ 0.72	$ 2.12	$ 1.82
Diluted	$ 0.66	$ 0.72	$ 2.12	$ 1.82