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Earnings Per Share (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Basic Net Income per Common Share Available to Common Stockholders [Abstract]        
Net income $ 8,200,000 $ 4,929,000 $ 14,464,000 $ 9,735,000
Preferred stock dividends 0 (275,000) 0 (825,000)
Net income available to common stockholders $ 8,200,000 $ 4,654,000 $ 14,464,000 $ 8,910,000
Weighted average common shares outstanding 12,491,757 9,152,709 12,483,788 8,804,107
Basic earnings per common share $ 0.66 $ 0.51 $ 1.16 $ 1.01
Diluted Net Income per Common Share Available to Common Stockholders [Abstract]        
Net income available to common stockholders $ 8,200,000 $ 4,654,000 $ 14,464,000 $ 8,910,000
Effect of assumed preferred stock conversion 0 275,000 0 825,000
Net income applicable to diluted earnings per share $ 8,200,000 $ 4,929,000 $ 14,464,000 $ 9,735,000
Weighted average common shares outstanding 12,491,757 9,152,709 12,483,788 8,804,107
Dilutive potential common shares [Abstract]        
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 0 1,864 0 2,045
Restricted stock awarded 836 5,232 836 5,232
Assumed conversion of preferred stock 7,338 685,067 7,338 1,020,207
Dilutive potential common shares 8,174 692,163 8,174 1,027,484
Diluted weighted average common shares outstanding 12,499,931 9,844,872 12,491,962 9,831,591
Diluted net income per common share available to common stockholders $ 0.66 $ 0.50 $ 1.16 $ 0.99
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