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Earnings Per Share (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Basic Net Income per Common Share Available to Common Stockholders [Abstract]        
Net income $ 8,234,000 $ 7,595,000 $ 26,661,000 $ 22,059,000
Weighted average common shares outstanding 15,290,539 12,528,674 13,982,339 12,498,913
Basic earnings per common share $ 0.54 $ 0.61 $ 1.91 $ 1.76
Diluted Net Income per Common Share Available to Common Stockholders [Abstract]        
Net income applicable to diluted earnings per share $ 8,234,000 $ 7,595,000 $ 26,661,000 $ 22,059,000
Weighted average common shares outstanding 15,290,539 12,528,674 13,982,339 12,498,913
Dilutive potential common shares [Abstract]        
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 2,429 6,299 3,570 6,827
Restricted stock awarded 13,250 836 13,250 836
Dilutive potential common shares 15,679 7,135 16,820 7,663
Diluted weighted average common shares outstanding 15,306,218 12,535,809 13,999,159 12,506,576
Diluted net income per common share available to common stockholders $ 0.54 $ 0.61 $ 1.90 $ 1.76