CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Retained Earnings	Accumulated Other Comprehensive Income
Balance at Dec. 31, 2013	$ 175,226	$ 166	$ 143,322	$ 34,815	$ (3,077)
Balance (in shares) at Dec. 31, 2013		16,656,279
Increase (Decrease) in Stockholders' Equity
Net income	12,725			12,725
Other comprehensive income	3,161				3,161
Share-based compensation expense	377		377
Common stock repurchased and retired	(2,757)	$ (2)	(2,755)
Common stock repurchased and retired (in shares)		(262,897)
Common stock issued	9,012	$ 6	9,006
Common stock issued (in shares)		562,469
Exercise of stock options	113	$ 1	112
Exercise of stock options (in shares)		113,365
Balance at Sep. 30, 2014	$ 197,857	$ 171	150,062	47,540	84
Balance (in shares) at Sep. 30, 2014	17,069,216	17,069,216
Balance at Dec. 31, 2014	$ 199,592	$ 169	147,474	51,431	518
Balance (in shares) at Dec. 31, 2014	16,903,884	16,903,884
Increase (Decrease) in Stockholders' Equity
Net income	$ 17,450
Other comprehensive income	161
Share-based compensation expense	670		670
Common stock issued	72,252	$ 45	72,207
Common stock issued (in shares)		4,480,645
Warrants exercised	689	$ 1	688
Warrant exercise (in shares)		125,316
Repurchase of common stock	(116)		(116)
Repurchase of common stock (in shares)		(7,165)
Exercise of stock options	69		69
Exercise of stock options (in shares)		7,998
Balance at Sep. 30, 2015	$ 290,767	$ 215	$ 220,992	$ 68,881	$ 679
Balance (in shares) at Sep. 30, 2015	21,510,678	21,510,678