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Earnings Per Share - Schedule of 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
Basic
Net income available to common shareholders	$ 22,059	$ 16,926	$ 42,495	$ 32,642
Less: income attributable to unvested stock-based compensation awards	(359)	(266)	(706)	(527)
Net earnings allocated to common shareholders	$ 21,700	$ 16,660	$ 41,789	$ 32,115
Weighted average shares outstanding, including unvested stock-based compensation awards (in shares)	15,280,412	15,184,835	15,276,194	15,168,310
Less: unvested stock-based compensation awards (in shares)	(242,351)	(239,901)	(250,402)	(245,242)
Weighted average shares outstanding - Basic (in shares)	15,038,061	14,944,934	15,025,792	14,923,068
Diluted
Net earnings allocated to common shareholders	$ 21,700	$ 16,660	$ 41,789	$ 32,115
Weighted average shares outstanding - Basic (in shares)	15,038,061	14,944,934	15,025,792	14,923,068
Plus: Incremental shares from assumed conversion of stock-based compensation awards (in shares)	97,909	121,927	98,475	131,802
Weighted average shares outstanding - Diluted (in shares)	15,135,970	15,066,861	15,124,267	15,054,870
Basic EPS (in dollars per share)	$ 1.44	$ 1.11	$ 2.78	$ 2.15
Diluted EPS (in dollars per share)	$ 1.43	$ 1.11	$ 2.76	$ 2.13

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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