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Derivatives and Hedging Activities (Details) (Interest rate swaps [Member], Designated as Hedging Instrument [Member], USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Interest rate swaps [Member] \| Designated as Hedging Instrument [Member]
Notional values or contractual amounts and fair value of the corporation's derivatives designated in hedge relationships
Derivative Asset, Notional/Contract Amount	$ 0	$ 6,920	$ 0
Derivative Asset, Fair Value	0	0	0
Derivative Liability, Notional/Contract Amount	267,792	303,933	350,743
Derivative Liability, Fair Value	$ 25,772	$ 28,550	$ 33,907

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.

+ References+ Details

- 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