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Derivative Instruments (Details 5) (Variable Interest Entity [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Interest rate swaps [Member]
Summary of notional for VIE derivatives outstanding
Derivative products, Notional Amount	$ 1,721,100	$ 1,702,113
Interest rate swaps pay-fixed/receive-variable [Member]
Summary of notional for VIE derivatives outstanding
Derivative products, Notional Amount	4,586,220	4,535,626
Currency Swaps [Member]
Summary of notional for VIE derivatives outstanding
Derivative products, Notional Amount	729,213	721,168
Credit Derivatives [Member]
Summary of notional for VIE derivatives outstanding
Derivative products, Notional Amount	$ 20,605	$ 20,934

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- Details

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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