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Derivative And Hedging Activities (Details 1) (Interest Rate Swap [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Interest Rate Swap [Member]
   
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) $ 6 $ (557)
Amount of (Gain)/ Loss Reclassified from AOCI into Income (Effective Portion) 1,954 4,708
Amount of Gain /(Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) $ 33 $ 13