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Earnings Per Share - Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator:
Net income available to common shareholders	$ 4,090,053	$ 4,360,109	$ 13,581,550	$ 11,726,282
Denominator:
Weighted average common shares outstanding	7,007	6,872	6,972	6,824
Effect of dilutive securities:
Weighted average common shares outstanding - assuming dilution	7,281	7,124	7,241	7,088
Basic earnings per common share	$ 0.58	$ 0.63	$ 1.95	$ 1.72
Diluted earnings per common share	$ 0.56	$ 0.61	$ 1.88	$ 1.65
Restricted Stock [Member]
Effect of dilutive securities:
Restricted stock / Stock options	3	4	3	4
Stock Options [Member]
Effect of dilutive securities:
Restricted stock / Stock options	271	248	266	260

X

- Definition

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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