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Derivative And Hedging Activities (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 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) $ 10 $ 450
Amount of (Gain)/ Loss Reclassified from AOCI into Income (Effective Portion) 731 982
Amount of Gain /(Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) $ 18 $ (24)