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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Basic
Net income available to common shareholders	$ 20,436	$ 15,717
Less: Income attributable to unvested stock-based compensation awards	(347)	(261)
Net earnings allocated to common shareholders	$ 20,089	$ 15,456
Weighted average shares outstanding, including unvested stock-based compensation awards (in shares)	15,271,930	15,151,521
Less: unvested stock-based compensation awards (in shares)	(258,452)	(250,583)
Weighted average shares outstanding - Basic (in shares)	15,013,478	14,900,938
Diluted
Net earnings allocated to common shareholders	$ 20,089	$ 15,456
Weighted average shares outstanding - Basic (in shares)	15,013,478	14,900,938
Plus: Incremental shares from assumed conversion of stock-based compensation (in shares)	99,040	141,676
Weighted average shares outstanding - Diluted (in shares)	15,112,518	15,042,614
Basic EPS (in dollars per share)	$ 1.34	$ 1.04
Diluted EPS (in dollars per share)	$ 1.33	$ 1.03
Antidilutive securities excluded from computation of earnings per share (in shares)	20,242	48,515

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