Participation In The Treasury Capital Purchase Program (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended
Oct. 28, 2008
Sep. 30, 2012
Dec. 31, 2011
Jan. 09, 2009
Series C Cumulative Perpetual Preferred Stock [Member]
Jan. 09, 2009
United States Treasury Stock [Member]
Participation In Treasury Capital Purchase Program [Line Items]          
Series C fixed rate cumulative perpetual preferred stock, authorized       32,668  
Cumulative perpetual preferred stock, series C, par value       $ 1.00  
Preferred stock liquidation value       $ 1,000  
Issuance of warrants, common stock purchased         508,320
Common stock exercise price         $ 9.64
Cumulative dividend rate       5.00%  
Cumulative dividend rate, after year five       9.00%  
Cash dividend per share $ 0.14        
Accrued dividend   $ 6.0 $ 4.6