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Investments In Securities And Fair Value (Schedule Of Assumptions Used To Determine Fair Value) (Details)	12 Months Ended
	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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