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United Bankshares, Inc. (Parent Company Only) Financial Information - Condensed Balance Sheets (Parenthetical) (Detail) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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Condensed Balance Sheet Statements, Captions [Line Items] |  |
Accumulated other comprehensive loss | $ 138,927 | $ 223,903
United Bankshares [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Accumulated other comprehensive loss | $ 138,927 | $ 223,903

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