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Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share Basic [Abstract]
Net income - basic	$ 16,956	$ 15,481	$ 33,125	$ 29,005
Basic weighted average common shares	19,208,601	19,162,049	19,197,925	19,156,250
Basic earnings per common share	$ 0.88	$ 0.81	$ 1.73	$ 1.51
Net income - diluted	$ 16,956	$ 15,481	$ 33,125	$ 29,005
Weighted average common shares	19,208,601	19,162,049	19,197,925	19,156,250
Stock options and restricted stock	58,134	65,911	77,958	71,747
Diluted weighted average common shares	19,266,735	19,227,960	19,275,883	19,227,997
Diluted earnings per common share	$ 0.88	$ 0.81	$ 1.72	$ 1.51

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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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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