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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator [Abstract]
Net income	$ 11,599	$ 11,541	$ 27,413	$ 22,818
Basic earnings per share [Abstract]
Weighted average shares (in shares)	17,687,000	17,626,000	17,679,000	17,621,000
Diluted earnings per share [Abstract]
Effect of dilutive stock options and restricted stock grants (in shares)	16,000	19,000	16,000	20,000
Adjusted weighted average shares (in shares)	17,703,000	17,645,000	17,695,000	17,641,000
Earnings per share [Abstract]
Basic earnings per share (in dollars per share)	$ 0.66	$ 0.65	$ 1.55	$ 1.29
Diluted earnings per share (in dollars per share)	$ 0.66	$ 0.65	$ 1.55	$ 1.29
Options [Member]
Earnings Per Share [Abstract]
Options excluded from diluted calculations (in shares)	0	0	0	0

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