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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Earnings Per Share [Abstract]      
Stock options excluded (in shares) 86,044 0 412,748
Net Income      
Basic income available to common stockholders $ 8,554 $ 8,065 $ 1,789
Diluted income available to common stockholders plus assumed conversions $ 8,554 $ 8,065 $ 1,789
Shares      
Basic income available to common stockholders (in shares) 25,555,654 21,510,746 20,091,924
Effect of dilutive stock options and warrants (in shares) 396,530 430,289 290,908
Diluted income available to common stockholders plus assumed conversions (in shares) 25,952,184 21,941,035 20,382,832
Per Share Amount      
Basic income available to common stockholders (in dollars per share) $ 0.33 $ 0.38 $ 0.09
Diluted income available to common stockholders plus assumed conversions (in dollars per share) $ 0.33 $ 0.37 $ 0.09