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Derivative Instruments (Details 1) (Interest Rate Swap Member, Availableforsale Securities Member, USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2011
Interest Rate Swap Member | Availableforsale Securities Member
   
Net Derivatives Gains Losses Recognized On Fair Value Derivatives And Related Hedged Items [Line Items]    
Derivative Instruments Gain Loss Recognized In Income Net $ (655,000) $ (921,000)
Change In Unrealized Gain Loss On Hedged Item In Fair Value Hedge 913,000 1,509,000
Gain Loss On Fair Value Hedge Ineffectiveness Net $ 258,000 $ 588,000