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Earnings Per Share - Two-class method (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share      
Net Income $ 52,681 $ 44,675 $ 29,540
Dividends and undistributed earnings allocated to participating securities 802 770 647
Net income available to common shareholders $ 51,879 $ 43,905 $ 28,893
Weighted-average common shares outstanding for basic earnings per share 17,189 17,106 14,736
Dilutive effect of stock-based awards 297 332 357
Weighted-average common shares outstanding for diluted earnings per share 17,486 17,438 15,093
Earnings per common share:      
Basic earnings per common share $ 3.02 $ 2.57 $ 1.96
Diluted earnings per common share $ 2.97 $ 2.52 $ 1.91