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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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share Basic [Abstract]
Net income	$ 21,386	$ 19,701	$ 58,676	$ 52,826
Basic weighted average common shares	19,256,069	19,216,545	19,243,689	19,204,196
Basic earnings per common share	$ 1.11	$ 1.03	$ 3.05	$ 2.75
Net income	$ 21,386	$ 19,701	$ 58,676	$ 52,826
Weighted average common shares	19,256,069	19,216,545	19,243,689	19,204,196
Stock options and restricted stock	46,482	56,439	76,510	76,840
Diluted weighted average common shares	19,302,551	19,272,984	19,320,199	19,281,036
Diluted earnings per common share	$ 1.11	$ 1.02	$ 3.04	$ 2.74

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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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