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Preferred Stock (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 6 Months Ended
Aug. 11, 2011
Jun. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Preferred Stock (Textual) [Abstract]          
Number of shares of Fixed Rate Cumulative Perpetual Preferred Stock Series D   21,000 21,000 21,000  
Preferred Stock (Additional Textual) [Abstract]          
Aggregate purchase price of fixed rate cumulative perpetual preferred stock $ 21        
Repurchase of preferred stock, shares outstanding   21,000 21,000    
Percentage of lending incentive fee payable   0.50%      
Minimum percentage tier one capital to be maintain         90.00%
Preferred stock, shares outstanding   21,000 21,000 21,000  
Preferred Stock, Shares Issued   21,000 21,000 21,000  
Increased percentage of lending incentive fee     1.00%    
Noncumulative Series E Preferred Stock [Member]
          
Preferred Stock (Textual) [Abstract]          
Number of shares of Fixed Rate Cumulative Perpetual Preferred Stock Series D 21,000        
Preferred stock, interest rate, percentage     9.00%    
Preferred Stock (Additional Textual) [Abstract]          
Preferred Stock, Shares Issued 21,000        
Noncumulative Series E Preferred Stock [Member] | Minimum [Member]
          
Preferred Stock (Textual) [Abstract]          
Preferred stock, interest rate, percentage     1.00%    
Noncumulative Series E Preferred Stock [Member] | Maximum [Member]
          
Preferred Stock (Textual) [Abstract]          
Preferred stock, interest rate, percentage     5.00%    
Series E Preferred Stock [Member]
          
Preferred Stock (Textual) [Abstract]          
Redemption price of series E preferred stock     100.00%