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Fair Value Measurement (Schedule Of Assumptions Used To Determine Fair Value) (Details) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011
Minimum [Member] |  |
Fair Value Measurement [Line Items] |  |
Cumulative probability of earning maximum rate until maturity | 0.00% | 0.00%
Cumulative probability of principle returned prior to maturity | 95.80% | 95.40%
Cumulative probability of default at some future point | 1.40% | 1.30%
Liquidity risk premium | 4.00% | 4.50%
Maximum [Member] |  |
Fair Value Measurement [Line Items] |  |
Cumulative probability of earning maximum rate until maturity | 0.20% | 0.10%
Cumulative probability of principle returned prior to maturity | 98.60% | 98.70%
Cumulative probability of default at some future point | 4.20% | 4.60%
Liquidity risk premium | 4.50% | 5.00%

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- Details
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- Definition Percentage of cumulative probability of default at some future point + References No definition available. + Details
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- Definition Percentage of cumulative probability of earning maximum rate until maturity + References No definition available. + Details
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- Definition Percentage of cumulative probability of principle returned prior to maturity + References No definition available. + Details
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- Definition Percentage Of Liquidity Risk Premium + References No definition available. + Details
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Balance Type: | na
Period Type: | duration