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Derivatives and Hedging Activities (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Summary of net amortization income recognized        
Net amortization income $ 61 $ 61 $ 183 $ 183