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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, 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
Basic Net Income per Common Share Available to Common Stockholders:                      
Net income available to common stockholders $ 13,569,000 $ 11,565,000 $ 10,137,000 $ 9,999,000 $ 11,976,000 $ 11,670,000 $ 10,981,000 $ 13,316,000 $ 45,270,000 $ 47,943,000 $ 36,600,000
Weighted average common shares outstanding                 16,716,880 16,675,269 14,487,126
Basic earnings per common share $ 0.81 $ 0.69 $ 0.61 $ 0.60 $ 0.72 $ 0.70 $ 0.66 $ 0.80 $ 2.71 $ 2.88 $ 2.53
Diluted Net Income per Common Share Available to Common Stockholders:                      
Net income available to common stockholders                 $ 45,270,000 $ 47,943,000 $ 36,600,000
Weighted average common shares outstanding                 16,716,880 16,675,269 14,487,126
Dilutive potential common shares:                      
Assumed conversion of stock options                 0 0 209
Restricted stock awarded                 45,976 34,207 13,250
Dilutive potential common shares                 45,976 34,207 13,459
Diluted weighted average common shares outstanding                 16,762,856 16,709,476 14,500,585
Diluted earnings per common share $ 0.81 $ 0.69 $ 0.60 $ 0.60 $ 0.72 $ 0.70 $ 0.66 $ 0.80 $ 2.70 $ 2.87 $ 2.52