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Earnings Per Share - Factors Used in Computation of Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Basic    
Net income to common stockholders $ 4,812 $ 13,852
Weighted average common shares outstanding 17,816,930 17,711,527
Basic earnings per common share $ 0.27 $ 0.78
Diluted    
Net income to common stockholders $ 4,812 $ 13,852
Dilutive effect of preferred stock   192
Net income to common stockholders - diluted $ 4,812 $ 14,044
Weighted average common shares outstanding 17,816,930 17,711,527
Average shares and dilutive potential common shares 17,981,276 18,428,663
Dilutive earnings per common share $ 0.27 $ 0.76
Restricted Stock    
Diluted    
Dilutive effects of restricted stock 113,788 11,962
Preferred Stock - Series A    
Diluted    
Dilutive effects of assumed conversion of shares   315,773
Antidilutive shares 315,773  
Preferred Stock - Series B    
Diluted    
Dilutive effects of assumed conversion of shares   360,578
Antidilutive shares 360,578  
Warrant    
Diluted    
Dilutive effects of assumed exercises of stock warrants 50,558 28,823