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Derivative Instruments (Details 4) (AFS [Member], USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
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Interest rate swaps [Member] |  |
Summary of notional amounts of AFS's trading derivative products |  |
Derivative products, Notional Amount | $ 978,781 | $ 1,370,995
Interest rate swaps pay-fixed/receive-variable [Member] |  |
Summary of notional amounts of AFS's trading derivative products |  |
Derivative products, Notional Amount | 2,094,301 | 3,798,305
Interest rate swaps basis swaps [Member] |  |
Summary of notional amounts of AFS's trading derivative products |  |
Derivative products, Notional Amount | 175,835 | 175,835
Currency Swaps [Member] |  |
Summary of notional amounts of AFS's trading derivative products |  |
Derivative products, Notional Amount | 3,549 | 13,559
Future contracts [Member] |  |
Summary of notional amounts of AFS's trading derivative products |  |
Derivative products, Notional Amount | 295,000 | 53,500
Other contracts [Member] |  |
Summary of notional amounts of AFS's trading derivative products |  |
Derivative products, Notional Amount | $ 118,450 | $ 118,930

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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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Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration