Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Stock options excluded (in shares)	154,251	108,407	464,647	131,703	429,625
Net Income
Basic income available to common stockholders	$ 10,369	$ 8,554	$ 7,825	$ 18,923	$ 9,613
Diluted income available to common stockholders plus assumed conversions	$ 10,369	$ 8,554	$ 7,825	$ 18,923	$ 9,613
Shares
Basic income available to common stockholders (in shares)	27,378,930	25,555,654	21,493,641	26,467,292	20,796,655
Effect of dilutive stock options and warrants (in shares)	466,560	396,530	335,235	434,335	329,887
Diluted income available to common stockholders plus assumed conversions (in shares)	27,845,490	25,952,184	21,828,876	26,901,627	21,126,542
Per Share Amount
Basic income available to common stockholders (in dollars per share)	$ 0.38	$ 0.33	$ 0.36	$ 0.72	$ 0.46
Diluted income available to common stockholders plus assumed conversions (in dollars per share)	$ 0.37	$ 0.33	$ 0.36	$ 0.70	$ 0.46