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Capital Purchase Program (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Purchase Agreement [Member]
Dec. 31, 2012
Fixed Rate Cumulative Perpetual Preferred Stock, Series A [Member]
Aug. 29, 2012
Fixed Rate Cumulative Perpetual Preferred Stock, Series A [Member]
Dec. 31, 2012
Fixed Rate Cumulative Perpetual Preferred Stock, Series B [Member]
Aug. 29, 2012
Fixed Rate Cumulative Perpetual Preferred Stock, Series B [Member]
Capital Purchase Program (Textual) [Abstract]              
Number of shares       13,900      
Par value       $ 1.25      
Liquidation preference $ 1,000 $ 1,000   $ 1,000   $ 1,000  
Number of shares           695  
Exercise price 4.00         1.25  
Aggregate purchase price     $ 13.9        
Closing of sale     Mar. 13, 2009        
Increase in total capital           $ 13.9  
Cumulative dividends percentage until March 13, 2014     5.00%        
Cumulative dividend thereafter     9.00%        
Cumulative dividends of warrant preferred stock           9.00%  
Sale of stock, price         $ 882.50   $ 912.50
Capital Purchase Program (Additional Textual) [Abstract]              
Discount on preferred stock amortized period 5 years