Employee Benefit Plans - Schedule of Options Exercised (Details) - USD ($)	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Employee Benefits and Share-based Compensation, Noncash [Abstract]
Number of options exercised (shares)	20,434	55,007
Cash received from options exercised	$ 165,943	$ 290,357
Total intrinsic value of options exercised	240,403	825,653
Tax deduction realized from options	$ 72,325	$ 232,091

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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of share options (or share units) exercised during the current period.

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