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Derivative Instruments and Hedging Activities Schedule of Interest Rate Swaps Associated with U.S. Treasuries (Details) (USD $)
In Thousands, unless otherwise specified |
Jun. 30, 2013
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Dec. 31, 2012
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| Derivative [Line Items] | ||
| Trading securities, at fair value | $ 1,001,172 | $ 1,002,062 |
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Interest Rate Swaps Associated with U.S. Treasuries [Member]
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| Derivative [Line Items] | ||
| Derivative, Notional Amount | 1,000,000 | 1,000,000 |
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Interest Rate Swaps Associated with U.S. Treasuries [Member] | Derivative Maturity Over Two And Within Three Years From Balance Sheet Date [Member]
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| Derivative [Line Items] | ||
| Derivative, Notional Amount | $ 1,000,000 | $ 1,000,000 |
| Derivative, Average Fixed Interest Rate | 0.799% | 0.799% |
| Derivative, Average Variable Interest Rate | 0.28% | 0.35% |
| Derivative, Weighted Average Remaining Maturity | 1.778 | 2.278 |
| X | ||||||||||
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- Definition
Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The average time remaining until maturity on the group of derivatives identified. No definition available.
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- Definition
Average fixed interest rate related to the group of interest rate derivatives. No definition available.
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- Definition
Average variable interest rate related to the group of interest rate derivatives. No definition available.
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- Details
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- Definition
Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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