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Credit Quality and the Allowance for Loan and Lease Losses - Summary of Financial Impacts of Loans That Were Modified for Borrowers Experiencing Financial Difficulty (Details) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Commercial | Commercial and industrial loans |  |  |  |
Financing Receivable, Modifications |  |  |  |
Weighted-average length of term extensions | 8 months | 5 months | 13 months | 9 months
Weighted-average length of payment delay |  | 21 months | 14 months | 13 months
Commercial | Commercial mortgage owner-occupied loans |  |  |  |
Financing Receivable, Modifications |  |  |  |
Weighted-average length of term extensions | 5 months | 6 months | 6 months | 13 months
Weighted-average length of payment delay | 4 months |  | 4 months |
Commercial | Commercial mortgage nonowner-occupied loans |  |  |  |
Financing Receivable, Modifications |  |  |  |
Weighted-average length of term extensions | 5 months | 5 months | 8 months | 7 months
Commercial | Commercial construction loans |  |  |  |
Financing Receivable, Modifications |  |  |  |
Weighted-average length of term extensions |  | 5 months | 12 months | 9 months
Weighted-average length of payment delay | 6 months |  | 6 months |
Residential Mortgage |  |  |  |
Financing Receivable, Modifications |  |  |  |
Weighted-average length of term extensions | 8 years 10 months 24 days | 9 years 7 months 6 days | 9 years 7 months 6 days | 10 years
Approximate amount of payment delays as a percentage of the related loan balances | 11.00% | 13.00% | 11.00% | 12.00%
Weighted-average interest rate, before modification | 7.00% | 7.50% | 7.20% | 7.70%
Weighted-average interest rate, after modification | 6.60% | 6.80% | 6.90% | 7.00%
Consumer | Home equity |  |  |  |
Financing Receivable, Modifications |  |  |  |
Weighted-average length of term extensions | 22 years 10 months 24 days | 22 years 10 months 24 days | 20 years 9 months 18 days | 24 years
Approximate amount of payment delays as a percentage of the related loan balances | 7.00% | 5.00% | 7.00% | 5.00%
Weighted-average interest rate, before modification | 8.60% | 9.00% | 8.60% | 9.00%
Weighted-average interest rate, after modification | 6.90% | 7.30% | 7.00% | 7.20%
Consumer | Credit card |  |  |  |
Financing Receivable, Modifications |  |  |  |
Weighted-average interest rate, before modification | 23.00% | 23.80% | 23.10% | 23.80%
Weighted-average interest rate, after modification | 3.90% | 4.20% | 4.00% | 4.10%

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