Fair Value Measurments (Quantitative Information about Unobservable Inputs) (Details)	6 Months Ended
	May 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Liquidity risk premium	3.50%
Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Probability of earning maximum rate until maturity	0.20%
Probability of principal returned prior to maturity	74.90%
Probability of default	4.40%
Recovery rate in default	50.00%
Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Probability of earning maximum rate until maturity	12.10%
Probability of principal returned prior to maturity	94.40%
Probability of default	24.90%
Recovery rate in default	70.00%
Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Probability of earning maximum rate until maturity	2.10%
Probability of principal returned prior to maturity	86.20%
Probability of default	11.70%
Recovery rate in default	56.50%