CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Accumulated Retained Earnings	Accumulated Other Comprehensive Income
Balance at Dec. 31, 2011	$ 86,777	$ 103	$ 76,310	$ 10,046	$ 318
Balance (in shares) at Dec. 31, 2011		10,337,626
Increase (Decrease) in Stockholders' Equity
Net income	11,965			11,965
Other comprehensive income (loss)	1,040				1,040
Share-based compensation expense	96		96
Common stock repurchased and retired	(102)		(102)
Common stock repurchased and retired (in shares)		(13,022)
Stock options exercised	110		110
Stock options exercised (in shares)		18,830
Balance at Sep. 30, 2012	99,886	103	76,414	22,011	1,358
Balance (in shares) at Sep. 30, 2012	10,343,434	10,343,434
Balance at Dec. 31, 2012	134,517	137	107,453	25,822	1,105
Balance (in shares) at Dec. 31, 2012	13,661,648	13,661,648
Increase (Decrease) in Stockholders' Equity
Net income	4,789			4,789
Other comprehensive income (loss)	(3,742)				(3,742)
Share-based compensation expense	680		680
Common stock repurchased and retired	(41)		(41)
Common stock repurchased and retired (in shares)		(10,960)
Common stock issued	34,924	29	34,895
Common stock issued (in shares)		2,972,472
Stock options exercised	27		27
Stock options exercised (in shares)		18,831
Balance at Sep. 30, 2013	$ 171,154	$ 166	$ 143,014	$ 30,611	$ (2,637)
Balance (in shares) at Sep. 30, 2013	16,641,991	16,641,991