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Stock Compensation Plan - Schedule of Stock Option Exercised Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Intrinsic value of options exercised (on exercise date)	$ 1,523	$ 279	$ 1,820
Cash received from options exercised	534	228	1,796
Excess tax benefit realized from options exercised	$ 136	$ 103	$ 308

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

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-Name Accounting Standards Codification
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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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