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United Bankshares, Inc. (Parent Company Only) Financial Information - Condensed Statements of Cash Flows (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2025 | Sep. 30, 2025 | [1] | Jun. 30, 2025 | [1] | Mar. 31, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | [1] | Jun. 30, 2024 | [1] | Mar. 31, 2024 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Supplemental Cash Flow Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 128,828,000 | [1] | $ 130,748,000 | $ 120,721,000 | $ 84,306,000 | [1] | $ 94,408,000 | [1] | $ 95,267,000 | $ 96,507,000 | $ 86,814,000 | [1] | $ 464,603,000 | $ 372,996,000 | $ 366,313,000
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  | 13,089,000 | 12,130,000 | 12,463,000
Excess tax benefits from stock-based compensation arrangements |  |  |  |  |  |  |  |  |  |  |  |  | (83,000) | (258,000) | (128,000)
Net proceeds from sales of debt securities |  |  |  |  |  |  |  |  |  |  |  |  | 713,000 | 8,113,000 | 344,000
Repayment of subordinated notes |  |  |  |  |  |  |  |  |  |  |  |  | 20,575,000 | 0 | 10,250,000
Cash dividends paid |  |  |  |  |  |  |  |  |  |  |  |  | (209,002,000) | (200,727,000) | (194,727,000)
Acquisition of treasury stock |  |  |  |  |  |  |  |  |  |  |  |  | (126,989,000) | (1,040,000) | (1,382,000)
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  |  |  |  |  | 751,000 | 5,274,000 | 1,750,000
Cash and Cash Equivalents at Beginning of Year |  |  |  |  | 2,292,244,000 |  |  |  |  |  |  |  | 2,292,244,000 |  |
Cash and Cash Equivalents at End of Year | 2,542,250,000 |  |  |  |  |  | 2,292,244,000 |  |  |  |  |  | 2,542,250,000 | 2,292,244,000 |
United Bankshares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | 464,603,000 | 372,996,000 | 366,313,000
Equity in undistributed net income of subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  | (163,541,000) | (162,974,000) | (165,744,000)
Amortization of net periodic pension costs |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 | 141,000 | 204,000
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  | 13,089,000 | 12,130,000 | 12,463,000
Excess tax benefits from stock-based compensation arrangements |  |  |  |  |  |  |  |  |  |  |  |  | 83,000 | 258,000 | 128,000
Net change in other assets and liabilities |  |  |  |  |  |  |  |  |  |  |  |  | (14,316,000) | (5,925,000) | (5,420,000)
Net Cash Provided by Operating Activities |  |  |  |  |  |  |  |  |  |  |  |  | 299,919,000 | 216,626,000 | 207,944,000
Net proceeds from sales of debt securities |  |  |  |  |  |  |  |  |  |  |  |  | 410,000 | 183,000 | 338,000
Net (purchases) proceeds from sales of equity securities |  |  |  |  |  |  |  |  |  |  |  |  | (216,000) | 130,000 | (1,303,000)
Net cash paid in acquisition of subsidiary |  |  |  |  |  |  |  |  |  |  |  |  | 428,000 | 0 | 0
Increase in investment in subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  | (6,000,000) | (8,000,000) | (16,000,000)
Change in other investment securities |  |  |  |  |  |  |  |  |  |  |  |  | (1,795,000) | (1,187,000) | (1,525,000)
Net Cash Used in Investing Activities |  |  |  |  |  |  |  |  |  |  |  |  | (7,173,000) | (8,874,000) | (18,490,000)
Repayment of subordinated notes |  |  |  |  |  |  |  |  |  |  |  |  | (20,575,000) | 0 | (10,250,000)
Cash dividends paid |  |  |  |  |  |  |  |  |  |  |  |  | (209,002,000) | (200,727,000) | (194,727,000)
Acquisition of treasury stock |  |  |  |  |  |  |  |  |  |  |  |  | (126,989,000) | (1,040,000) | (1,382,000)
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  |  |  |  |  | 751,000 | 5,274,000 | 1,750,000
Net Cash Used in Financing Activities |  |  |  |  |  |  |  |  |  |  |  |  | (355,815,000) | (196,493,000) | (204,609,000)
(Decrease) Increase in Cash and Cash Equivalents |  |  |  |  |  |  |  |  |  |  |  |  | (63,069,000) | 11,259,000 | (15,155,000)
Cash and Cash Equivalents at Beginning of Year |  |  |  |  | $ 249,515,000 |  |  |  |  |  | $ 238,256,000 |  | 249,515,000 | 238,256,000 | 253,411,000
Cash and Cash Equivalents at End of Year | $ 186,446,000 |  |  |  |  |  | $ 249,515,000 |  |  |  |  |  | $ 186,446,000 | $ 249,515,000 | $ 238,256,000
[1] | For further information, see the related discussion “Quarterly Results” included in Management’s Discussion and Analysis.

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