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Investment Securities (Significant Assumptions Of Other-Than-Temporarily Impaired Securities) (Details) (USD $)
9 Months Ended
Sep. 30, 2011
Investment Securities [Abstract] 
Annual constant prepayment speed$ 8.44
Loss severity45.01%[1]
Life default rate, net of recoveries7.54%[2]
[1]Loss severity rates are projected considering collateral characteristics such as loan-to-value, creditworthiness of borrowers (FICO score) and geographic concentration.
[2]Default rates, net of expected recoveries, are projected by considering collateral characteristics including, but not limited to, loan-to-value, FICO score, and geographic concentration.