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United Bankshares, Inc. (Parent Company Only) Financial Information - Condensed Balance Sheets (Detail) - USD ($) | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and due from banks | $ 247,613,000 | $ 240,655,000 |  |
Securities available for sale | 3,059,452,000 | 2,959,719,000 |  |
Securities held to maturity | 1,020,000 | 1,020,000 |  |
Equity securities | 34,760,000 | 21,058,000 |  |
Other investment securities | 305,184,000 | 277,517,000 |  |
Goodwill | 2,018,848,000 | 1,888,889,000 |  |
Other assets | 301,400,000 | 269,641,000 |  |
Total Assets | 33,660,281,000 | 30,023,545,000 |  |
Accrued expenses and other liabilities | 242,502,000 | 230,271,000 |  |
Shareholders' equity (including other accumulated comprehensive losses of $138,927 and $223,903 at December 31, 2025 and 2024, respectively) | 5,495,983,000 | 4,993,223,000 | $ 4,771,240,000 | $ 4,516,193,000
Total Liabilities and Shareholders' Equity | 33,660,281,000 | 30,023,545,000 |  |
United Bankshares [Member] |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Cash and due from banks | 186,446,000 | 249,515,000 |  |
Securities available for sale | 5,253,000 | 5,663,000 |  |
Securities held to maturity | 20,000 | 20,000 |  |
Equity securities | 29,434,000 | 15,897,000 |  |
Other investment securities | 10,879,000 | 11,400,000 |  |
Bank subsidiaries | 5,577,829,000 | 5,024,692,000 |  |
Nonbank subsidiaries | 56,009,000 | 55,755,000 |  |
Goodwill | (16,466,000) | (16,715,000) |  |
Other assets | 33,837,000 | 32,152,000 |  |
Total Assets | 5,883,241,000 | 5,378,379,000 |  |
Junior subordinated debentures of subsidiary trusts | 281,817,000 | 280,221,000 |  |
Accrued expenses and other liabilities | 105,441,000 | 104,935,000 |  |
Shareholders' equity (including other accumulated comprehensive losses of $138,927 and $223,903 at December 31, 2025 and 2024, respectively) | 5,495,983,000 | 4,993,223,000 |  |
Total Liabilities and Shareholders' Equity | $ 5,883,241,000 | $ 5,378,379,000 |  |

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