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v3.25.4

Allowance for Credit Losses - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Reserve for lending-related commitments | $ 35,075,000 | $ 35,075,000 | $ 34,911,000 | $ 44,706,000
Maximum Period Related To Accrual Of Interest On Discontinued Loans |  | 90 days |  |
Accrued interest receivable net of allowance for credit loss | $ 109,232,000 | $ 109,232,000 | 102,412,000 |
Allowance for credit losses at acquisition |  | $ 17,518,000 | 0 | $ 0
Percentage Of Allowance For Loan And Lease Losses |  | 9.44% |  |
Allowance for Loan and Lease Losses, Period Increase (Decrease) |  | $ 25,674,000 |  |
UBSI Piedmont Bancorp [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for credit losses at acquisition |  | 18,726,000 |  |
Financing receivable non purchased with credit deterioration allowance for credit loss at acquisition date |  | 17,518,000 |  |
2027 [member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Percentage of projection for real GDP | 2.00% |  |  |
Percentage of unemployment rate | 4.20% |  |  |
2026 [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Percentage Points Increase In Unemployment Rate | 4.40% |  |  |
Percentage points reduction in gdp projection. | 2.30% |  |  |
Percentage of projection for real GDP | 1.80% |  |  |
Accrued Income Receivable [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Accrued interest receivable net of allowance for credit loss | $ 95,960,000,000 | $ 95,960,000,000 | $ 87,062,000,000 |

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