Loans And Allowance For Credit Losses (Summary Of Loans In The Personal Banking Portfolio Percentage Of Balances Outstanding ) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Loans And Allowance For Credit Losses [Abstract]
Credit Quality Personal Real Estate Loans Excluded	$ 185.6	$ 191.1
Consumer Healthcare Loans Excluded	$ 186.6	$ 188.1
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	1.00%	0.80%
Real Estate - Personal [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	2.40%	1.90%
Real Estate - Personal [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	7.40%	8.80%
Real Estate - Personal [Member] | 720 - 779 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	25.20%	24.50%
Real Estate - Personal [Member] | 780 and over [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	64.00%	64.00%
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	1.90%	2.30%
Consumer [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	3.90%	4.20%
Consumer [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	13.80%	14.10%
Consumer [Member] | 720 - 779 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	25.30%	23.90%
Consumer [Member] | 780 and over [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	55.10%	55.50%
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	0.90%	1.30%
Revolving Home Equity [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	2.60%	2.40%
Revolving Home Equity [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	9.40%	8.60%
Revolving Home Equity [Member] | 720 - 779 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	20.40%	22.20%
Revolving Home Equity [Member] | 780 and over [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	66.70%	65.50%
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	3.40%	5.00%
Consumer Credit Card [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	11.30%	12.30%
Consumer Credit Card [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	29.90%	31.20%
Consumer Credit Card [Member] | 720 - 779 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	28.20%	28.00%
Consumer Credit Card [Member] | 780 and over [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	27.20%	23.50%