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Earnings Per Share (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Basic Net Income per Common Share Available to Common Stockholders [Abstract]        
Net income $ 7,595,000 $ 5,308,000 $ 22,059,000 $ 15,043,000
Preferred stock dividends 0 0 0 (825,000)
Net income available to common stockholders $ 7,595,000 $ 5,308,000 $ 22,059,000 $ 14,218,000
Weighted average common shares outstanding 12,528,674 10,497,072 12,498,913 9,372,547
Basic earnings per common share $ 0.61 $ 0.51 $ 1.76 $ 1.52
Diluted Net Income per Common Share Available to Common Stockholders [Abstract]        
Net income available to common stockholders $ 7,595,000 $ 5,308,000 $ 22,059,000 $ 14,218,000
Effect of assumed preferred stock conversion 0 0 0 825,000
Net income applicable to diluted earnings per share $ 7,595,000 $ 5,308,000 $ 22,059,000 $ 15,043,000
Weighted average common shares outstanding 12,528,674 10,497,072 12,498,913 9,372,547
Dilutive potential common shares [Abstract]        
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 6,299 1,742 6,827 1,945
Restricted stock awarded 836 5,232 836 5,232
Assumed conversion of preferred stock 0 0 0 677,674
Dilutive potential common shares 7,135 6,974 7,663 684,851
Diluted weighted average common shares outstanding 12,535,809 10,504,046 12,506,576 10,057,398
Diluted net income per common share available to common stockholders $ 0.61 $ 0.51 $ 1.76 $ 1.50
Stock options to purchase shares of common stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares) 0 24,500 0 24,500