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Derivative Instruments (Effect Of Corporation's Derivative Financial Instruments On Income Statement) (Detail) (Interest Rate Contracts [Member], Other Income [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Interest Rate Contracts [Member] \| Other Income [Member]
Derivative [Line Items]
Interest rate products	$ 167	$ (635)	$ (220)

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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