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Derivative Instruments (Effect Of The Corporation's Derivative Financial Instruments On The Income Statement) (Details) (Interest Rate Products [Member], Other Income [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Interest Rate Products [Member] | Other Income [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Interest rate products $ (233) $ (153)