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Share Repurchase Program (Details) (USD $)	6 Months Ended	12 Months Ended
Share Repurchase Program (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Transactions in share repurchases
Repurchase of shares	(9,800)	(38,000)
Weighted average price per share repurchased	$ 20.77	$ 19.68

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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