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Derivative Instruments (Effect Of Corporation's Derivative Financial Instruments On Income Statement) (Detail) (Interest Rate Products [Member], Other Income [Member], USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Interest Rate Products [Member] \| Other Income [Member]
Derivative [Line Items]
Interest Rate Products Other income	$ 40	$ (475)

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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