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Derivative Activities (Netting Of Derivative Contracts) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Derivative Activities [Abstract]    
Asset derivatives, gross $ 131,308 $ 122,143
Asset derivatives, netting (5,098) (11,594)
Asset derivatives, net 126,210 110,549
Liability derivatives, gross 15,077 25,720
Liability derivatives, netting (5,098) (11,594)
Liability derivatives, net $ 9,979 $ 14,126