Investment Securities (Cash Flow Model Inputs Used To Calculate Credit Losses) (Details)	Dec. 31, 2013
Significant Inputs Range, Minimum [Member]
Investment [Line Items]
Prepayment CPR	0.00%
Projected cumulative default	16.00%
Credit support	0.00%
Loss severity	18.00%
Significant Inputs Range, Maximum [Member]
Investment [Line Items]
Prepayment CPR	25.00%
Projected cumulative default	52.00%
Credit support	14.00%
Loss severity	81.00%