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v3.25.3

Loans and the Allowance for Credit Losses - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Net deferred loan fee income (costs) | $ 13,700,000 |  | $ 13,700,000 |  | $ 11,900,000
Un-accreted discount on purchased loans from acquisitions | 317,000,000 |  | 317,000,000 |  | 10,500,000
Reserve on accrued interest related to CARES Act | 100,000 |  | 100,000 |  |
Reserve on accrued interest related to individually-evaluated loans | $ 100,000 |  | $ 100,000 |  |
Percentage of national unemployment projection | 4.70% |  | 4.70% |  |
Expected average percentage of national unemployment in future | 5.30% |  | 5.30% |  |
Accrued interest receivable for loans | $ 88,700,000 |  | $ 88,700,000 |  | 62,200,000
Accrued interest receivable for loans related to CARES Act | 13,600,000 |  | 13,600,000 |  | 13,900,000
Aggregate amount of residential real estate, home equity and consumer loans classified as substandard | 52,600,000 |  | 52,600,000 |  | 23,300,000
Internally assigned loan grades to residential real estate, home equity and consumer loans | 12,900,000 |  | 12,900,000 |  | 4,500,000
Unfunded commercial loan commitments | 26,700,000 |  | 26,700,000 |  | 36,100,000
Modifications loans | 63,848,000 | $ 23,995,000 | 113,695,000 | $ 50,019,000 |
Other real estate owned | 618,000 |  | 618,000 |  | 649,000
Net charge-offs |  |  | 15,967,000 | 9,577,000 |
Residential Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Modifications loans | 1,939,000 | 1,273,000 | 4,390,000 | 1,990,000 |
Other real estate owned | 600,000 |  | 600,000 |  |
Foreclosure proceedings in process on residential real estate loans | 11,300,000 |  | 11,300,000 |  | $ 4,000,000
Net charge-offs |  |  | 513,000 | 86,000 |
90 Days or More Past Due [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Modification to allowance due to modified loan subsequently defaulting | 0 |  | 0 |  |
Commercial and Industrial [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Modifications loans | $ 445,000 | $ 1,454,000 | 4,931,000 | 1,872,000 |
Net charge-offs |  |  | 4,399,000 | 5,259,000 |
Commercial and Industrial [Member] | Maximum [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Annual sales of borrowers |  |  | 100,000,000 |  |
Unfunded Loan Commitment [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Modifications loans |  |  | $ 3,700,000 | $ 1,700,000 |

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