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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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic
Net income available to common shareholders	$ 19,392	$ 22,059	$ 40,432	$ 42,495
Less: income attributable to unvested stock-based compensation awards	(306)	(359)	(655)	(706)
Net earnings allocated to common shareholders	$ 19,086	$ 21,700	$ 39,777	$ 41,789
Weighted average shares outstanding, including unvested stock-based compensation awards (in shares)	15,262,216	15,280,412	15,287,783	15,276,194
Less: unvested stock-based compensation awards (in shares)	(242,506)	(242,351)	(247,983)	(250,402)
Weighted average shares outstanding - Basic (in shares)	15,019,710	15,038,061	15,039,800	15,025,792
Diluted
Net earnings allocated to common shareholders	$ 19,086	$ 21,700	$ 39,777	$ 41,789
Weighted average shares outstanding - Basic (in shares)	15,019,710	15,038,061	15,039,800	15,025,792
Plus: Incremental shares from assumed conversion of stock-based compensation awards (in shares)	66,235	97,909	71,292	98,475
Weighted average shares outstanding - Diluted (in shares)	15,085,945	15,135,970	15,111,092	15,124,267
Basic EPS (in dollars per share)	$ 1.27	$ 1.44	$ 2.64	$ 2.78
Diluted EPS (in dollars per share)	$ 1.27	$ 1.43	$ 2.63	$ 2.76

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