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Earnings Per Share - Components of Basic and Diluted Net Income Per Common Share (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Basic net income per common share available to common stockholders:                      
Net income available to common stockholders $ 16,834,000 $ 18,326,000 $ 12,221,000 $ 4,109,000 $ 13,569,000 $ 11,565,000 $ 10,137,000 $ 9,999,000 $ 51,490,000 $ 45,270,000 $ 47,943,000
Weighted average common shares outstanding                 17,886,998 16,716,880 16,675,269
Basic earnings per common share $ 0.93 $ 1.01 $ 0.68 $ 0.24 $ 0.81 $ 0.69 $ 0.61 $ 0.60 $ 2.88 $ 2.71 $ 2.88
Diluted net income per common share available to common stockholders:                      
Net income available to common stockholders                 $ 51,490,000 $ 45,270,000 $ 47,943,000
Weighted average common shares outstanding                 17,886,998 16,716,880 16,675,269
Dilutive potential common shares:                      
Restricted stock awarded                 52,009 45,976 34,207
Dilutive potential common shares                 52,009 45,976 34,207
Diluted weighted average common shares outstanding                 17,939,007 16,762,856 16,709,476
Diluted earnings per common share $ 0.93 $ 1.01 $ 0.68 $ 0.24 $ 0.81 $ 0.69 $ 0.60 $ 0.60 $ 2.87 $ 2.70 $ 2.87