Loans And Allowance For Credit Losses (Summary Of Loans In The Personal Banking Portfolio Percentage Of Balances Outstanding by FICO Score ) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Loans And Allowance For Loan Losses [Line Items]
Credit Quality Personal Real Estate Loans Excluded	$ 186.8	$ 185.6
Consumer Healthcare Loans Excluded	$ 197.7	$ 186.6
Credit quality personal banking loan table percentage loans excluded	7.00%
Real estate - personal
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Real estate - personal | Under 600
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	1.30%	1.00%
Real estate - personal | 600 - 659
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	2.50%	2.40%
Real estate - personal | 660 - 719
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	8.10%	7.40%
Real estate - personal | 720 - 779
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	23.50%	25.20%
Real estate - personal | 780 and over
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	64.60%	64.00%
Consumer
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Consumer | Under 600
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	1.80%	1.90%
Consumer | 600 - 659
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	3.90%	3.90%
Consumer | 660 - 719
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	13.20%	13.80%
Consumer | 720 - 779
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	23.80%	25.30%
Consumer | 780 and over
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	57.30%	55.10%
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
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	1.50%	0.90%
Revolving Home Equity [Member] | 600 - 659
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	3.40%	2.60%
Revolving Home Equity [Member] | 660 - 719
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	9.10%	9.40%
Revolving Home Equity [Member] | 720 - 779
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	22.40%	20.40%
Revolving Home Equity [Member] | 780 and over
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	63.60%	66.70%
Consumer credit card
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Consumer credit card | Under 600
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	3.60%	3.40%
Consumer credit card | 600 - 659
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	11.80%	11.30%
Consumer credit card | 660 - 719
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	30.20%	29.90%
Consumer credit card | 720 - 779
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	27.90%	28.20%
Consumer credit card | 780 and over
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	26.50%	27.20%