Stock Repurchases (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2011	Sep. 30, 2011	Jun. 30, 2011	Sep. 30, 2012
Stock Repurchases
Repurchase of common stock, authorized amount	$ 20,000
Repurchase of common stock, remaining authorized amount				12,467
Shares repurchased		286,109	27,803
Average price per share (in dollars per share)		$ 16.08	$ 15.52
Average commissions per share (in dollars per share)		$ 0.03	$ 0.03
Value of stock repurchased		$ 4,600	$ 431
Shares held as treasury stock	27,803	55,370	27,803