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Regulatory Matters - Additional Information (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2026 | Dec. 31, 2025 | Dec. 31, 2024
Regulatory Matters [Line Items] |  |  |
Average reserve balances to be maintained by subsidiary banks |  | $ 2,036,744,000 | $ 1,184,007,000
Average reserve balances required by subsidiary banks |  | $ 0 | $ 0
Retained net profits available for distribution to United Bankshares, Inc. by its banking subsidiaries as dividends | $ 339,113,000 |  |
Maximum loan to parent company by subsidiaries as percentage it's of capital and surplus |  | 10.00% |
Maximum amount of loan to parent company by subsidiaries |  | $ 425,053,000 |

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- Definition Average reserve balances to be maintained by subsidiary banks. + References No definition available. + Details
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- Definition Maximum amount of loan to parent company by subsidiaries. + References No definition available. + Details
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- Definition Maximum loan to parent company by subsidiaries as percentage of capital and surplus. + References No definition available. + Details
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- Definition This element represents disclosure of the aggregate cash dividends paid to the entity by consolidated subsidiaries. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3 + Details
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