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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Share [Abstract]          
Stock options excluded (in shares) 780,659 814,369 503,676 800,806 593,387
Net Income          
Net income $ 7,825 $ 1,789 $ 4,643 $ 9,613 $ 7,275
Basic income available to common stockholders 7,825 1,789 4,643 9,613 7,275
Diluted income available to common stockholders plus assumed conversions $ 7,825 $ 1,789 $ 4,643 $ 9,613 $ 7,275
Shares          
Basic income available to common stockholders (in shares) 21,493,641 20,091,924 17,124,337 20,796,655 17,083,194
Effect of dilutive stock options and warrants (in shares) 335,235 290,908 352,053 329,887 339,734
Diluted income available to common stockholders plus assumed conversions (in shares) 21,828,876 20,382,832 17,476,390 21,126,542 17,422,928
Per Share Amount          
Basic income available to common stockholders (in dollars per share) $ 0.36 $ 0.09 $ 0.28 $ 0.46 $ 0.43
Diluted income available to common stockholders plus assumed conversions (in dollars per share) $ 0.36 $ 0.09 $ 0.27 $ 0.46 $ 0.42