Earnings Per Share - Computation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net income per consolidated statements of income	$ 5,330	$ 4,125	$ 8,650	$ 7,811
Net income allocated to participating securities	(40)	(25)	(55)	(39)
Net income allocated to common stock	5,290	4,100	8,595	7,772
Distributed earnings allocated to common stock	1,180	490	2,368	979
Undistributed earnings allocated to common stock	4,110	3,610	6,227	6,793
Net income allocated to common stock	$ 5,290	$ 4,100	$ 8,595	$ 7,772
Weighted average common shares outstanding, including shares considered participating securities	47,223	48,649	47,405	48,968
Less: Average participating securities	(354)	(290)	(299)	(244)
Weighted average shares	46,869	48,359	47,106	48,724
Basic earnings per common share	$ 0.11	$ 0.08	$ 0.18	$ 0.16
Weighted average common shares outstanding for basic earnings per common share	46,869	48,359	47,106	48,724
Add: Dilutive effects of assumed exercises of stock options	248	275	247	273
Weighted average shares and dilutive potential common shares	47,117	48,634	47,353	48,997
Diluted earnings per common share	$ 0.11	$ 0.08	$ 0.18	$ 0.16

Average participating securities.

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Net income or loss available to common stockholders, basic, less allocation to participating securities.

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Undistributed earnings allocated to common shareholders.

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The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned.

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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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount of undistributed earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic).

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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