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Earnings Per Share - Two-class method (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share
Net Income	$ 11,694	$ 11,474	$ 26,909	$ 16,837
Dividends and undistributed earnings allocated to participating securities	179	200	432	282
Net income available to common shareholders	$ 11,515	$ 11,274	$ 26,477	$ 16,555
Weighted-average common shares outstanding for basic earnings per share	17,194	17,111	17,170	17,091
Dilutive effect of stock-based awards	303	334	312	334
Weighted-average common shares outstanding for diluted earnings per share	17,497	17,445	17,482	17,425
Earnings per common share:
Basic earnings per common share	$ 0.67	$ 0.66	$ 1.54	$ 0.97
Diluted earnings per common share	$ 0.66	$ 0.65	$ 1.52	$ 0.95

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
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