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Derivative Financial Instruments (Derivatives Used to Hedge Changes in Fair Value Attributable to Interest Rate Risk) (Details) (Fair Value Hedges [Member], Interest Rate Contract [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Fair Value Hedges [Member] | Interest Rate Contract [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain or (Loss) Recognized in Income on Derivative $ (480) $ 0
Amount of Gain or (Loss) Recognized in Income on Hedged Item 535 0
Income Statement Gain/(Loss) due to Hedge Ineffectiveness $ 55 $ 0