Loans And Allowance For Credit Losses (Summary Of Loans In The Personal Banking Portfolio Percentage Of Balances Outstanding ) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Loans And Allowance For Credit Losses [Abstract]
Credit Quality Personal Real Estate Loans Excluded	$ 168.9	$ 179.2
Consumer Healthcare Loans Excluded	$ 211.3	$ 197.5
Credit quality personal banking loan table percentage loans excluded	7.00%
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	2.00%	1.40%
Real Estate - Personal [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	2.30%	2.20%
Real Estate - Personal [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	8.50%	8.10%
Real Estate - Personal [Member] | 720 - 779 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	21.90%	23.70%
Real Estate - Personal [Member] | 780 and over [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	65.30%	64.60%
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	2.50%	2.20%
Consumer [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	4.30%	4.20%
Consumer [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	12.90%	14.50%
Consumer [Member] | 720 - 779 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	28.20%	26.70%
Consumer [Member] | 780 and over [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	52.10%	52.40%
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	1.90%	1.50%
Revolving Home Equity [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	3.30%	2.80%
Revolving Home Equity [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	10.90%	9.70%
Revolving Home Equity [Member] | 720 - 779 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	22.40%	21.40%
Revolving Home Equity [Member] | 780 and over [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	61.50%	64.60%
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	4.70%	3.40%
Consumer Credit Card [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	12.10%	11.40%
Consumer Credit Card [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	29.20%	30.80%
Consumer Credit Card [Member] | 720 - 779 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	27.00%	27.10%
Consumer Credit Card [Member] | 780 and over [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	27.00%	27.30%