Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income/(Loss) (numerator)
Net income applicable to earnings per share									$ 25,515	$ 16,616	$ 8,993
Basic earnings per share: Income available to common stockholders	$ 8,065	$ 7,837	$ 7,825	$ 1,789	$ 3,891	$ 5,450	$ 4,643	$ 2,632	25,515	16,616	8,993
Diluted earnings per share: Income available to common stockholders									$ 25,515	$ 16,616	$ 8,993
Shares (denominator)
Basic income available to common stockholders (in shares)									21,156,668	17,046,660	15,798,885
Effect of dilutive stock options (in shares)									332,030	297,317	811,069
Diluted income available to common stockholders plus assumed conversions (in shares)									21,488,698	17,343,977	16,609,954
Per Share Amount
Basic income available to common stockholders (in dollars per share)	$ 0.38	$ 0.36	$ 0.36	$ 0.09	$ 0.23	$ 0.32	$ 0.28	$ 0.15	$ 1.21	$ 0.97	$ 0.57
Diluted income available to common stockholders plus assumed conversions (in dollars per share)	$ 0.37	$ 0.36	$ 0.36	$ 0.09	$ 0.23	$ 0.31	$ 0.27	$ 0.15	$ 1.19	$ 0.96	$ 0.54