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United Bankshares, Inc. (Parent Company Only) Financial Information - Condensed Statements of Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Condensed Income Statements, Captions [Line Items]                      
Net interest income $ 287,457 $ 280,115 $ 274,537 $ 260,055 $ 232,608 $ 230,256 $ 225,715 $ 222,489 $ 1,102,164 $ 911,068 $ 919,924
Income before income taxes and Equity in Undistributed Net Income of Subsidiaries                 583,400 464,579 463,805
Applicable income tax benefit 31,068 33,735 31,367 22,627 26,651 24,649 18,878 21,405 118,797 91,583 97,492
Net Income $ 128,828 [1] $ 130,748 [1] $ 120,721 [1] $ 84,306 [1] $ 94,408 [1] $ 95,267 [1] $ 96,507 [1] $ 86,814 [1] 464,603 372,996 366,313
United Bankshares [Member]                      
Condensed Income Statements, Captions [Line Items]                      
Bank subsidiaries                 317,000 231,000 217,000
Net interest income                 720 933 970
Bank subsidiaries                 51,913 48,307 43,852
Nonbank subsidiaries                 51 51 27
Other income                 12,580 5,064 2,167
Total Income                 382,264 285,355 264,016
Interest paid on borrowings                 767 0 0
Operating expenses                 83,167 80,922 67,968
Total Expenses                 83,934 80,922 67,968
Income before income taxes and Equity in Undistributed Net Income of Subsidiaries                 298,330 204,433 196,048
Applicable income tax benefit                 (2,732) (5,589) (4,521)
Income of Subsidiaries                 301,062 210,022 200,569
Bank subsidiaries                 169,335 169,778 170,997
Nonbank subsidiaries                 (5,794) (6,804) (5,253)
Net Income                 $ 464,603 $ 372,996 $ 366,313
[1] For further information, see the related discussion “Quarterly Results” included in Management’s Discussion and Analysis.