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Derivative Financial Instruments (Details) (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2012
item
Dec. 31, 2011
Derivative Financial Instruments [Abstract]    
Interest rate swaps designated as cash flow hedges, notional amount $ 20,000,000  
Fair values of effective portion of hedges reflected in Other Comprehensive Income (1,230,000) (1,410,000)
Number of interest rate derivative positions 2  
Interest rate derivatives, combined notional amount 28,880,000  
Fair value of interest rate derivatives $ 599,000 $ 206,000