Quarterly report pursuant to Section 13 or 15(d)

Hedging Activities (Narrative) (Details)

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Hedging Activities (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2012
General Discussion of Derivative Instruments and Hedging Activities [Abstract]        
Expected to reclassify out of accumulated other comprehensive income for the remainder of the year       $ 1,647,000
Loss on Fair Value Hedge Ineffectiveness $ (179,000) $ (100,000) $ 0