Loans And Allowance For Loan Losses (Summary Of Loans In The Personal Banking Portfolio Percentage Of Balances Outstanding ) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Loans And Allowance For Loan Losses [Line Items]
Credit Quality Personal Real Estate Loans Excluded	$ 225.6	$ 222.8
Credit Quality Consumer Loans Excluded	$ 127.1	$ 148.7
Credit quality personal banking loan table percentage loans excluded	8.80%	9.80%
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Real Estate - Personal [Member] | Under 600 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	2.40%	3.40%
Real Estate - Personal [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	3.60%	4.10%
Real Estate - Personal [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	10.00%	12.20%
Real Estate - Personal [Member] | 720 - 780 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	26.70%	29.20%
Real Estate - Personal [Member] | Over 780 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	57.30%	51.10%
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Consumer [Member] | Under 600 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	6.50%	8.40%
Consumer [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	10.40%	11.00%
Consumer [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	24.30%	23.20%
Consumer [Member] | 720 - 780 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	26.70%	26.00%
Consumer [Member] | Over 780 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	32.10%	31.40%
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Revolving Home Equity [Member] | Under 600 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	2.40%	2.60%
Revolving Home Equity [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	5.60%	4.90%
Revolving Home Equity [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	16.30%	15.10%
Revolving Home Equity [Member] | 720 - 780 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	29.00%	26.30%
Revolving Home Equity [Member] | Over 780 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	46.70%	51.10%
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Consumer Credit Card [Member] | Under 600 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	4.40%	4.90%
Consumer Credit Card [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	11.60%	11.20%
Consumer Credit Card [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	32.70%	31.00%
Consumer Credit Card [Member] | 720 - 780 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	28.40%	29.00%
Consumer Credit Card [Member] | Over 780 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	22.90%	23.90%