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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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