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United Bankshares, Inc. (Parent Company Only) Financial Information - Condensed Balance Sheets (Detail) - USD ($)
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash and due from banks $ 247,613,000 $ 240,655,000    
Securities available for sale 3,059,452,000 2,959,719,000    
Securities held to maturity 1,020,000 1,020,000    
Equity securities 34,760,000 21,058,000    
Other investment securities 305,184,000 277,517,000    
Goodwill 2,018,848,000 1,888,889,000    
Other assets 301,400,000 269,641,000    
Total Assets 33,660,281,000 30,023,545,000    
Accrued expenses and other liabilities 242,502,000 230,271,000    
Shareholders' equity (including other accumulated comprehensive losses of $138,927 and $223,903 at December 31, 2025 and 2024, respectively) 5,495,983,000 4,993,223,000 $ 4,771,240,000 $ 4,516,193,000
Total Liabilities and Shareholders' Equity 33,660,281,000 30,023,545,000    
United Bankshares [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash and due from banks 186,446,000 249,515,000    
Securities available for sale 5,253,000 5,663,000    
Securities held to maturity 20,000 20,000    
Equity securities 29,434,000 15,897,000    
Other investment securities 10,879,000 11,400,000    
Bank subsidiaries 5,577,829,000 5,024,692,000    
Nonbank subsidiaries 56,009,000 55,755,000    
Goodwill (16,466,000) (16,715,000)    
Other assets 33,837,000 32,152,000    
Total Assets 5,883,241,000 5,378,379,000    
Junior subordinated debentures of subsidiary trusts 281,817,000 280,221,000    
Accrued expenses and other liabilities 105,441,000 104,935,000    
Shareholders' equity (including other accumulated comprehensive losses of $138,927 and $223,903 at December 31, 2025 and 2024, respectively) 5,495,983,000 4,993,223,000    
Total Liabilities and Shareholders' Equity $ 5,883,241,000 $ 5,378,379,000