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Mergers and Acquisitions - Summary of Business Acquisitions, by Acquisition (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024
Identifiable liabilities: |  |
Resulting goodwill | $ 2,018,848,000 | $ 1,888,889,000
UBSI Piedmont Bancorp [Member] |  |
Purchase price: |  |
Value of common shares issued | 280,946,000 |
Cash for fractional shares | 21,000 |
Total purchase price | 280,967,000 |
Identifiable assets: |  |
Cash and cash equivalents | 77,497,000 |
Investment securities | 94,426,000 |
Net loans and leases | 1,998,350,000 |
Premises and equipment | 23,816,000 |
Operating lease right-of-use asset | 5,124,000 |
BOLI | 40,801,000 |
Core deposit intangible | 32,764,000 |
Other assets | 30,573,000 |
Total identifiable assets | 2,303,351,000 |
Identifiable liabilities: |  |
Deposits | 2,105,810,000 |
Long-term borrowings | 20,000,000 |
Operating lease liability | 5,744,000 |
Other liabilities | 20,789,000 |
Total identifiable liabilities | 2,152,343,000 |
Fair value of net assets acquired including identifiable intangible assets | 151,008,000 |
Resulting goodwill | $ 129,959,000 |

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