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Loans and the Allowance for Credit Losses - Recorded Investment in Non-Accrual Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | $ 94,463 | $ 39,752
Commercial and Industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 21,299 | 1,897
Home Equity [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 8,217 | 6,208
Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 33,543 | 19,036
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 1,688 |
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 31,855 | 19,036
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 29,810 | 12,524
Consumer [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | $ 1,594 | $ 87

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