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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Basic earnings per common share computation:
Net income per consolidated statements of income	$ 9,473	$ 7,097
Net earnings allocated to participating securities	(39)	(34)
Net earnings allocated to common stock	$ 9,434	$ 7,063
Weighted average common shares outstanding, including shares considered participating securities (in shares)	15,229,000	15,273,000
Less: Average participating securities (in shares)	(62,000)	(72,000)
Weighted average shares (in shares)	15,167,000	15,201,000
Basic earnings per common share (in dollar per share)	$ 0.62	$ 0.46
Diluted earnings per common share computation:
Net earnings allocated to common stock	$ 9,434	$ 7,063
Weighted average common shares outstanding for basic earnings per common share (in shares)	15,167,000	15,201,000
Add: Dilutive effects of assumed exercises of stock options (in shares)	0	0
Weighted average shares and dilutive potential common shares (in shares)	15,167,000	15,201,000
Diluted earnings per common share (in dollar per share)	$ 0.62	$ 0.46
Distributed earnings allocated to common stock
Basic earnings per common share computation:
Net earnings allocated to common stock	$ 2,579	$ 2,509
Undistributed earnings allocated to common stock
Basic earnings per common share computation:
Net earnings allocated to common stock	$ 6,855	$ 4,554

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