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	Dec. 31, 2014	Dec. 31, 2013
Loans And Allowance For Loan Losses [Line Items]
Credit quality personal real estate loans excluded	$ 244.3	$ 244.3
Personal real estate loans excluded from table, as a percentage of Personal Banking portfolio	6.00%	6.00%
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	1.40%	1.70%
Real Estate - Personal [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	3.10%	3.30%
Real Estate - Personal [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	9.90%	10.30%
Real Estate - Personal [Member] | 720 - 780 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	26.70%	25.80%
Real Estate - Personal [Member] | Over 780 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	58.90%	58.90%
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	5.20%	5.40%
Consumer [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	10.20%	10.10%
Consumer [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	22.90%	23.40%
Consumer [Member] | 720 - 780 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	28.00%	28.30%
Consumer [Member] | Over 780 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	33.70%	32.80%
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	1.80%	2.10%
Revolving Home Equity [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	4.40%	7.30%
Revolving Home Equity [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	13.70%	15.00%
Revolving Home Equity [Member] | 720 - 780 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	32.80%	28.50%
Revolving Home Equity [Member] | Over 780 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	47.30%	47.10%
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	4.10%	4.10%
Consumer Credit Card [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	11.80%	11.70%
Consumer Credit Card [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	32.40%	32.90%
Consumer Credit Card [Member] | 720 - 780 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	27.80%	27.90%
Consumer Credit Card [Member] | Over 780 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	23.90%	23.40%