Stock Repurchases (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011	Jun. 30, 2012
Stock Repurchases
Repurchase of common stock, authorized amount	$ 20,000
Repurchase of common stock, remaining authorized amount			12,467
Shares repurchased		27,803
Average price per share (in dollars per share)		$ 15.52
Average commissions per share (in dollars per share)		$ 0.03
Value of stock repurchased		$ 431
Shares held as treasury stock	27,803	27,803