Derivative Instruments (Effect Of The Corporation's Derivative Financial Instruments On The Income Statement) (Details) (Interest Rate Contract [Member], Other Income [Member], USD $) In Thousands	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010
Interest Rate Contract [Member] \| Other Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate products	$ (475)	$ (399)

- Definition

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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