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Earnings Per Share - Calculation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 15,253	$ 14,583
Average Common Shares:
Basic (weighted-average outstanding shares)	11,698	11,606
Dilutive potential common shares from stock options	79	133
Diluted (weighted-average outstanding shares)	11,777	11,739
Basic earnings per share (in dollars per share)	$ 1.30	$ 1.26
Diluted earnings per share (in dollars per share)	$ 1.30	$ 1.24

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