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Derivative Instruments (Details 5) (Variable Interest Entity [Member], USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
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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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- 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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