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Earnings Per Share - Components of Basic and Diluted Net Income Per Common Share (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Basic Net Income per Common Share Available to Common Stockholders:        
Net income $ 18,326,000 $ 11,565,000 $ 34,656,000 $ 31,701,000
Weighted average common shares outstanding 18,083,126 16,728,191 17,819,619 16,710,485
Basic earnings per common share $ 1.01 $ 0.69 $ 1.94 $ 1.90
Diluted Net Income per Common Share Available to Common Stockholders:        
Net income applicable to diluted earnings per share $ 18,326,000 $ 11,565,000 $ 34,656,000 $ 31,701,000
Weighted average common shares outstanding 18,083,126 16,728,191 17,819,619 16,710,485
Dilutive potential common shares: restricted stock awarded 53,020 46,908 53,020 46,908
Diluted weighted average common shares outstanding 18,136,146 16,775,099 17,872,639 16,757,393
Diluted earnings per common share $ 1.01 $ 0.69 $ 1.94 $ 1.89