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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Basic earnings per common share computation:
Net income per consolidated statements of income	$ 6,683	$ 4,065	$ 13,163	$ 9,084
Net earnings allocated to participating securities	(40)	(27)	(78)	(60)
Net earnings allocated to common stock	$ 6,643	$ 4,038	$ 13,085	$ 9,024
Weighted average common shares outstanding, including shares considered participating securities	15,294	14,460	15,138	14,448
Less: Average participating securities	(88)	(92)	(87)	(86)
Weighted average shares	15,206	14,368	15,051	14,362
Basic earnings per common share	$ 0.44	$ 0.28	$ 0.87	$ 0.63
Diluted earnings per common share computation:
Net earnings allocated to common stock	$ 6,643	$ 4,038	$ 13,085	$ 9,024
Weighted average shares and dilutive potential common shares	15,206	14,368	15,051	14,362
Diluted earnings per common share	$ 0.44	$ 0.28	$ 0.87	$ 0.63
Distributed Earnings Allocated to Common Stock [Member]
Basic earnings per common share computation:
Net earnings allocated to common stock	$ 2,507	$ 2,369	$ 5,015	$ 4,737
Undistributed Earnings Allocated to Common Stock [Member]
Basic earnings per common share computation:
Net earnings allocated to common stock	$ 4,136	$ 1,669	$ 8,070	$ 4,287

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The amount of net income (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.

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