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Derivative And Hedging Activities (Details 1) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Gains and losses recognized on the Corporation's derivative instruments designated as cash flow hedges    
Amount of Gain /(Loss) Recognized in OCI on Derivatives (Effective Portion) $ (14) $ (374)
Amount of (Gain)/ Loss Reclassified from AOCI into Income (Effective Portion) 1,458 2,962
Amount of Gain /(Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) $ 33 $ (6)