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Investments In Securities And Fair Value (Schedule Of Assumptions Used To Determine Fair Value) (Details) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 Minimum [Member] | Dec. 31, 2011 Maximum [Member]
Fair Value Measurement [Line Items] |  |  |
Cumulative probability of earning maximum rate until maturity | 0.00% | 0.00% | 0.10%
Cumulative probability of principle returned prior to maturity | 96.10% | 95.40% | 98.70%
Cumulative probability of default at some future point | 3.90% | 1.30% | 4.60%

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- 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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