Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $) In Thousands, except Share data	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income
Beginning balance at Dec. 31, 2011	$ 216,441	$ 84,079	$ 128,551	$ 3,811
Beginning balance, shares at Dec. 31, 2011		15,978,958
Net income	3,931		3,931
Other comprehensive loss	(153)			(153)
Stock option vesting	257	257
Dividends paid ($0.09 per share)	(1,438)		(1,438)
Ending balance at Mar. 31, 2012	219,038	84,336	131,044	3,658
Ending balance, shares at Mar. 31, 2012		15,978,958
Beginning balance at Dec. 31, 2012	229,359	85,561	141,639	2,159
Beginning balance, shares at Dec. 31, 2012	16,000,838	16,000,838
Net income	8,477		8,477
Other comprehensive loss	(621)			(621)
Stock option vesting	236	236
Stock options exercised	262	262
Stock options exercised, shares		20,000
Tax benefit of stock options exercised	20	20
Repurchase of common stock, value	(262)	(84)	(178)
Repurchase of common stock, shares		(15,647)
Dividends paid ($0.09 per share)	(1,441)		(1,441)
Ending balance at Mar. 31, 2013	$ 236,030	$ 85,995	$ 148,497	$ 1,538
Ending balance, shares at Mar. 31, 2013	16,005,191	16,005,191