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	7,275			7,275
Other comprehensive income	3,055				3,055
Share-based compensation expense	257		257
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)		112,790
Balance at Jun. 30, 2014	$ 192,181	$ 171	149,942	42,090	(22)
Balance (in shares) at Jun. 30, 2014	17,068,641	17,068,641
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	$ 9,613
Other comprehensive income	(943)
Share-based compensation expense	435		435
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)		125,196
Repurchase of common stock	(93)		(93)
Repurchase of common stock (in shares)		(5,833)
Exercise of stock options	48		48
Exercise of stock options (in shares)		6,666
Balance at Jun. 30, 2015	$ 281,593	$ 215	$ 220,759	$ 61,044	$ (425)
Balance (in shares) at Jun. 30, 2015	21,510,558	21,510,558