Stock Repurchase Plan (Additional Information) (Details)	Jun. 30, 2013	Dec. 31, 2012	Apr. 26, 2001
Common stock, authorized shares repurchase			607,754
Common stock, total shares repurchased	334,965	334,965

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

No definition available.

Name:	us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant