Loan Sales And Securitizations (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Loan Sales And Securitizations [Abstract]
Single-family residential mortgage loans transferred	$ 75.8	$ 53.3	$ 174.6	$ 245.9
Net pre-tax gains on sale of residential mortgage loan	$ 1.5	$ 1.1	$ 3.5	$ 4.7
Percentage of single-family mortgage loans received as fees	0.29%	0.29%
Percentage of outstanding balance generating for annual servicing inclusive excess interests	0.34%	0.34%
Percentage of HELOC and home equity loans received as fees	0.50%	0.50%
Percentage variation in assumptions that can not necessarily be extrapolated			10.00%