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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator [Abstract]
Net income	$ 16,106	$ 13,763	$ 43,519	$ 36,581
Basic earnings per share [Abstract]
Weighted average shares (in shares)	17,691,000	17,633,000	17,683,000	17,625,000
Diluted earnings per share [Abstract]
Effect of dilutive stock options and restricted stock grants (in shares)	19,000	20,000	17,000	20,000
Adjusted weighted average shares (in shares)	17,710,000	17,653,000	17,700,000	17,645,000
Earnings per share [Abstract]
Basic earnings per share (in dollars per share)	$ 0.91	$ 0.78	$ 2.46	$ 2.08
Diluted earnings per share (in dollars per share)	$ 0.91	$ 0.78	$ 2.46	$ 2.07
Options [Member]
Earnings Per Share [Abstract]
Options excluded from diluted calculations (in shares)	0	0	0	0

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