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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ 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
Numerator [Abstract]
Net income	$ 18,324	$ 14,939	$ 11,599	$ 15,814	$ 33,263	$ 27,413
Basic earnings per share [Abstract]
Weighted average shares (in shares)	17,721,000		17,687,000		17,717,000	17,679,000
Diluted earnings per share [Abstract]
Effect of dilutive stock options and restricted stock grants (in shares)	12,000		16,000		11,000	16,000
Adjusted weighted average shares (in shares)	17,733,000		17,703,000		17,728,000	17,695,000
Earnings per share [Abstract]
Basic earnings per share (in dollars per share)	$ 1.03		$ 0.66		$ 1.88	$ 1.55
Diluted earnings per share (in dollars per share)	$ 1.03		$ 0.66		$ 1.88	$ 1.55
Options [Member]
Earnings Per Share [Abstract]
Options excluded from diluted calculations (in shares)	0		0		0	0

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