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Earnings Per Share - Treasury stock method (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Basis:                      
Net income attributable to common shareholders $ 10,179 $ 17,659 $ 11,474 $ 5,363 $ 7,652 $ 7,104 $ 8,348 $ 6,436 $ 44,675 $ 29,540 $ 25,866
Weighted-average common shares outstanding                 17,106 14,736 13,763
Basic earnings per common share $ 0.64 $ 1.01 $ 0.66 $ 0.31 $ 0.44 $ 0.49 $ 0.60 $ 0.47 $ 2.57 $ 1.96 $ 1.88
Diluted:                      
Net income attributable to common shareholders $ 10,179 $ 17,659 $ 11,474 $ 5,363 $ 7,652 $ 7,104 $ 8,348 $ 6,436 $ 44,675 $ 29,540 $ 25,866
Weighted-average common shares outstanding                 17,106 14,736 13,763
Add: Dilutive effect of stock-based awards                 332 357 300
Weighted-average common shares outstanding for diluted earnings per share                 17,438 15,093 14,063
Diluted earnings per common share $ 0.63 $ 0.99 $ 0.65 $ 0.30 $ 0.43 $ 0.48 $ 0.59 $ 0.46 $ 2.52 $ 1.91 $ 1.84