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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
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.