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Significant Accounting Policies (Details Textual)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Financial_Institutions
Jun. 30, 2012
Stock Options [Member]
Jun. 30, 2011
Stock Options [Member]
Significant Accounting Policies (Textual) [Abstract]          
Numbers of financial institutions     2    
Weighted options outstanding to purchase common stock 10.2 5.1   11.3 9.6
Contractual maturity of a particular investment     1 year    
Respective stock option     4 years