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Credit Quality And Allowance For Credit Losses (Financial Effect of Loan Modifications) (Details)		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Term Extension (in months)		1 year 5 months 23 days	9 months 7 days	1 year 3 months 11 days	11 months 1 day
Weighted-Average Interest Rate Reduction		(2.51%)	1.09%	(1.91%)	0.89%
Business loans:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Term Extension (in months)		1 year 29 days	7 months 13 days	1 year 18 days	9 months 22 days
Weighted-Average Interest Rate Reduction		(1.00%)	0.81%	(1.23%)	0.70%
Business loans: | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Term Extension (in months)		1 year 22 days	7 months 13 days	1 year 22 days	8 months 1 day
Weighted-Average Interest Rate Reduction		(1.00%)	0.50%	(1.23%)	0.49%
Business loans: | Commercial | International
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Term Extension (in months)		10 months 21 days		11 months 12 days
Weighted-Average Interest Rate Reduction		0.00%		0.00%
Retail loans: | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Term Extension (in months)		8 years 3 months 29 days	10 years 11 months 5 days	8 years 7 months 6 days	10 years 9 months
Weighted-Average Interest Rate Reduction		4.34%	2.85%	4.01%	2.64%
Commercial mortgage: | Commercial | Other business lines
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Term Extension (in months)	[1]				1 year 9 months 29 days
Commercial mortgage: | Business loans: | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Term Extension (in months)		1 year 4 months 28 days	8 months 23 days	1 year 11 days	1 year 9 months 29 days
Weighted-Average Interest Rate Reduction		0.00%	1.00%	0.00%	0.79%
Commercial mortgage: | Business loans: | Commercial | Other business lines
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Term Extension (in months)	[1]	1 year 4 months 28 days	8 months 23 days	1 year 11 days
Weighted-Average Interest Rate Reduction	[1]	0.00%	1.00%	0.00%	0.79%
Home equity | Retail loans: | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Term Extension (in months)		10 years	10 years 11 months 5 days	9 years 11 months 9 days	10 years 9 months
Weighted-Average Interest Rate Reduction		(4.34%)	(2.85%)	(4.01%)	(2.64%)
Consumer Loan | Retail loans: | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Term Extension (in months)		10 years	10 years 11 months 5 days	9 years 11 months 9 days	10 years 9 months
Weighted-Average Interest Rate Reduction		4.34%	2.85%	4.01%	2.64%
[1] Primarily loans secured by owner-occupied real estate.

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