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Credit Quality and the Allowance for Loan and Lease Losses - Summary of Financial Impacts of Commercial Loans That Were Modified for Borrowers Experiencing Financial Difficulty (Details) - Commercial | 3 Months Ended | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Commercial and industrial loans |  |  |  |
Financing Receivable, Modifications |  |  |  |
Weighted-average length of term extensions | 9 months | 20 months | 9 months | 16 months
Weighted-average length of payment delay | 6 months | 9 months | 5 months | 9 months
Commercial mortgage owner-occupied loans |  |  |  |
Financing Receivable, Modifications |  |  |  |
Weighted-average length of term extensions | 5 months | 6 months | 5 months | 7 months
Weighted-average length of payment delay | 1 month | 6 months | 1 month | 10 months
Commercial mortgage nonowner-occupied loans |  |  |  |
Financing Receivable, Modifications |  |  |  |
Weighted-average length of term extensions | 9 months |  | 9 months | 6 months
Commercial construction loans |  |  |  |
Financing Receivable, Modifications |  |  |  |
Weighted-average length of term extensions | 3 months | 12 months | 6 months | 12 months
Weighted-average length of payment delay |  |  |  | 7 months

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