Credit Quality And Allowance For Credit Losses (Financial Effect of Loan Modifications) (Details)	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Interest Rate Reduction	(2.20%)	1.49%
Financing Receivable, Modified, Weighted Average Term Increase from Modification	15 years 10 months 24 days	13 years 1 month 6 days
Business loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Interest Rate Reduction	(1.21%)	1.35%
Financing Receivable, Modified, Weighted Average Term Increase from Modification	13 years 7 months 6 days	7 months 13 days
Retail loans \| Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Interest Rate Reduction	0.00%
Financing Receivable, Modified, Weighted Average Term Increase from Modification	95 years 1 month 6 days
Commercial borrower \| Business loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Interest Rate Reduction	(1.21%)	(2.01%)
Financing Receivable, Modified, Weighted Average Term Increase from Modification	12 years 8 months 12 days	10 years 4 months 24 days
Commercial borrower \| Business loans \| International
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Interest Rate Reduction	0.00%
Financing Receivable, Modified, Weighted Average Term Increase from Modification	46 years 1 month 6 days
Commercial borrower \| Business loans \| Commercial mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Interest Rate Reduction	0.00%	0.68%
Financing Receivable, Modified, Weighted Average Term Increase from Modification	14 years 1 month 6 days	17 years 7 months 6 days
Commercial borrower \| Business loans \| Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Interest Rate Reduction		0.00%
Financing Receivable, Modified, Weighted Average Term Increase from Modification		9 years 3 months 18 days
Commercial borrower \| Business loans \| Other business lines \| Commercial mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Interest Rate Reduction	0.00%	0.68%
Financing Receivable, Modified, Weighted Average Term Increase from Modification	14 years 1 month 6 days	17 years 7 months 6 days
Commercial borrower \| Business loans \| Other business lines \| Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Interest Rate Reduction		0.00%
Financing Receivable, Modified, Weighted Average Term Increase from Modification		9 years 3 months 18 days
Consumer borrower \| Retail loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Interest Rate Reduction	3.97%	3.01%
Financing Receivable, Modified, Weighted Average Term Increase from Modification	102 years 2 months 12 days	145 years 4 months 24 days
Consumer borrower \| Retail loans \| Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Interest Rate Reduction	(3.97%)	(3.01%)
Financing Receivable, Modified, Weighted Average Term Increase from Modification	117 years	145 years 4 months 24 days
Consumer borrower \| Retail loans \| Consumer Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Interest Rate Reduction	3.97%	3.01%
Financing Receivable, Modified, Weighted Average Term Increase from Modification	117 years	145 years 4 months 24 days

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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