Loans and the Allowance for Credit Losses - Summary of Financial Impacts of Loan Modifications and Payment Deferrals to Portfolio Loans (Detail) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Home Equity [Member] | ||||
| Financing Receivable, Modified [Line Items] | ||||
| Weighted-average term extension (in months) | 120 months | 120 months | ||
| Commercial and Industrial [Member] | ||||
| Financing Receivable, Modified [Line Items] | ||||
| Weighted-average term extension (in months) | 5 months | 7 months | 6 months | 13 months |
| Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member] | ||||
| Financing Receivable, Modified [Line Items] | ||||
| Weighted-average term extension (in months) | 6 months | |||
| Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member] | ||||
| Financing Receivable, Modified [Line Items] | ||||
| Weighted-average term extension (in months) | 14 months | 14 months | 9 months | |