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Derivative Instruments (Fair Value Of The Corporation's Derivative Financial Instruments And Their Classification On The Balance Sheet) (Details) (Not Designated As Hedging Instrument [Member], Interest Rate Products [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 48,813	$ 52,857
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 49,093	$ 52,904

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details