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Earnings Per Share (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Basic Net Income per Common Share Available to Common Stockholders [Abstract]        
Net income $ 10,037,000 $ 8,200,000 $ 18,427,000 $ 14,464,000
Weighted average common shares outstanding 13,956,674 12,491,757 13,317,395 12,483,788
Basic earnings per common share $ 0.72 $ 0.66 $ 1.38 $ 1.16
Diluted Net Income per Common Share Available to Common Stockholders [Abstract]        
Net income applicable to diluted earnings per share $ 10,037,000 $ 8,200,000 $ 18,427,000 $ 14,464,000
Weighted average common shares outstanding 13,956,674 12,491,757 13,317,395 12,483,788
Dilutive potential common shares [Abstract]        
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 4,124 836 4,053 836
Restricted stock awarded 13,250 7,338 13,250 7,338
Assumed conversion of preferred stock 0 0 0 0
Dilutive potential common shares 17,374 8,174 17,303 8,174
Diluted weighted average common shares outstanding 13,974,048 12,499,931 13,334,698 12,491,962
Diluted net income per common share available to common stockholders $ 0.72 $ 0.66 $ 1.38 $ 1.16