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Credit Quality And Allowance For Credit Losses (Financial Effect of Loan Modifications) (Details)
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Weighted-Average Term Extension (in months) 1 year 6 months 4 days 11 months 5 days
Weighted-Average Interest Rate Reduction (3.24%) 1.40%
Business loans:    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Weighted-Average Term Extension (in months) 1 year 6 months 4 days 9 months 29 days
Weighted-Average Interest Rate Reduction 0.00% 1.11%
Business loans: | Commercial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Weighted-Average Term Extension (in months) 1 year 4 months 2 days 9 months 26 days
Weighted-Average Interest Rate Reduction 0.00% 1.11%
Retail loans: | Consumer    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Weighted-Average Term Extension (in months)   9 years 9 months 15 days
Weighted-Average Interest Rate Reduction 3.24% 3.11%
Commercial mortgage: | Business loans: | Commercial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Weighted-Average Term Extension (in months) 1 year 8 months 5 days 1 year 11 days
Weighted-Average Interest Rate Reduction 0.00% 0.00%
Commercial mortgage: | Business loans: | Commercial | Commercial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Weighted-Average Interest Rate Reduction 0.00%  
Commercial mortgage: | Business loans: | Commercial | Other business lines    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Weighted-Average Term Extension (in months) [1] 1 year 5 months 12 days 1 year 11 days
Weighted-Average Interest Rate Reduction [1] 0.00% 0.00%
Home equity | Retail loans: | Consumer    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Weighted-Average Term Extension (in months)   9 years 9 months 15 days
Weighted-Average Interest Rate Reduction (3.24%) (3.11%)
Consumer Loan | Retail loans: | Consumer    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Weighted-Average Term Extension (in months)   9 years 9 months 15 days
Weighted-Average Interest Rate Reduction 3.24% 3.11%
[1] Primarily loans secured by owner-occupied real estate.