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Derivatives and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Derivatives designated in hedge relationships
Derivative Asset, Fair Value	$ 62,056	$ 47,764
Interest rate swaps [Member] \| Designated as Hedging Instrument [Member]
Derivatives designated in hedge relationships
Derivative Asset, Notional/Contract Amount	819	6,920
Derivative Asset, Fair Value	0	0
Derivative Liability, Notional/Contract Amount	234,330	303,933
Derivative Liability, Fair Value	$ 25,889	$ 28,550

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