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Junior Subordinated Debentures And Mandatory Redeemable Capital Debentures (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 12 Months Ended
Sep. 15, 2012
Jun. 28, 2007
Dec. 31, 2012
Dec. 31, 2011
Junior Subordinated Debentures And Mandatory Redeemable Capital Debentures [Abstract]        
Amount of securities issued to investors   $ 12.5    
Basis of variable rate     three month LIBOR  
Variable rate addition     1.44%  
Variable interest rate during the period     1.75% 1.99%
Variable rate junior subordinated debentures   $ 12.9    
Redemption percentage of par 100.00% 103.50%    
Maturity date   Sep. 15, 2037