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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				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 20,667	$ 15,253	$ 18,771	$ 14,583	$ 35,920	$ 33,354
Average Common Shares:
Basic (weighted-average outstanding shares)	11,726		11,652		11,712	11,629
Dilutive potential common shares from stock options	72		107		75	120
Diluted (weighted-average outstanding shares)	11,798		11,759		11,787	11,749
Basic earnings per share (in dollars per share)	$ 1.76		$ 1.61		$ 3.07	$ 2.87
Diluted earnings per share (in dollars per share)	$ 1.75		$ 1.60		$ 3.05	$ 2.84

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