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Regulatory Matters - Capital Amounts and Ratios (Detail)
$ in Thousands
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
United Bankshares [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk-Weighted Assets, Actual Amount $ 4,191,144 $ 3,897,755
Tier 1 Capital to Risk-Weighted Assets, Actual Amount 3,583,795 3,335,667
Common Tier I Capital to Risk Weighted Assets, Actual Amount 3,583,795 3,335,667
Tier 1 Capital to Average Assets, Actual Amount $ 3,583,795 $ 3,335,667
Total Capital to Risk-Weighted Assets, Actual Ratio 15.7 16.5
Tier 1 Capital to Risk-Weighted Assets, Actual Ratio 13.4 14.1
Common Tier I Capital to Risk Weighted Assets, Actual Ratio 13.4 14.1
Tier 1 Capital to Average Assets, Actual Ratio 11.3 11.7
Total Capital to Risk-Weighted Assets, For Capital Adequacy Purposes, Amount $ 2,133,353 $ 1,887,433
Tier 1 Capital to Risk-Weighted Assets, For Capital Adequacy Purposes, Amount 1,600,014 1,415,575
Common Tier I Capital to Risk Weighted Assets, For Capital Adequacy Purposes, Amount 1,200,011 1,061,681
Tier 1 Capital to Average Assets, For Capital Adequacy Purposes, Amount $ 1,270,832 $ 1,136,661
Total Capital to Risk-Weighted Assets, For Capital Adequacy, Ratio 8 8
Tier 1 Capital to Risk-Weighted Assets, For Capital Adequacy Purposes, Ratio 6 6
Common Tier I Capital to Risk Weighted Assets, For Capital Adequacy Purposes, Ratio 450.00% 450.00%
Tier 1 Capital to Average Assets, For Capital Adequacy Purposes, Ratio 4 4
Total Capital to Risk-Weighted Assets, To Be Well Capitalized, Amount $ 2,666,691 $ 2,359,292
Tier 1 Capital to Risk-Weighted Assets, To Be Well Capitalized, Amount 2,133,353 1,887,433
Common Tier I Capital to Risk Weighted Assets, To Be Well Capitalized, Amount 1,733,349 1,533,540
Tier 1 Capital to Average Assets, To Be Well Capitalized, Amount $ 1,588,540 $ 1,420,827
Total Capital to Risk-Weighted Assets, To Be Well Capitalized, Ratio 10 10
Tier 1 Capital to Risk-Weighted Assets, To Be Well Capitalized, Ratio 8 8
Common Tier I Capital to Risk Weighted Assets, To Be Well Capitalized, Ratio 650.00% 650.00%
Tier 1 Capital to Average Assets To Be Well Capitalized, Ratio 5 5
United Bank [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk-Weighted Assets, Actual Amount $ 3,967,217 $ 3,620,657
Tier 1 Capital to Risk-Weighted Assets, Actual Amount 3,647,868 3,348,071
Common Tier I Capital to Risk Weighted Assets, Actual Amount 3,647,868 3,348,071
Tier 1 Capital to Average Assets, Actual Amount $ 3,647,868 $ 3,348,071
Total Capital to Risk-Weighted Assets, Actual Ratio 15 15.4
Tier 1 Capital to Risk-Weighted Assets, Actual Ratio 13.8 14.3
Common Tier I Capital to Risk Weighted Assets, Actual Ratio 13.8 14.3
Tier 1 Capital to Average Assets, Actual Ratio 11.5 11.8
Total Capital to Risk-Weighted Assets, For Capital Adequacy Purposes, Amount $ 2,122,625 $ 1,877,704
Tier 1 Capital to Risk-Weighted Assets, For Capital Adequacy Purposes, Amount 1,591,968 1,408,278
Common Tier I Capital to Risk Weighted Assets, For Capital Adequacy Purposes, Amount 1,193,976 1,056,209
Tier 1 Capital to Average Assets, For Capital Adequacy Purposes, Amount $ 1,265,588 $ 1,132,023
Total Capital to Risk-Weighted Assets, For Capital Adequacy, Ratio 8 8
Tier 1 Capital to Risk-Weighted Assets, For Capital Adequacy Purposes, Ratio 6 6
Common Tier I Capital to Risk Weighted Assets, For Capital Adequacy Purposes, Ratio 450.00% 450.00%
Tier 1 Capital to Average Assets, For Capital Adequacy Purposes, Ratio 4 4
Total Capital to Risk-Weighted Assets, To Be Well Capitalized, Amount $ 2,653,281 $ 2,347,131
Tier 1 Capital to Risk-Weighted Assets, To Be Well Capitalized, Amount 2,122,625 1,877,704
Common Tier I Capital to Risk Weighted Assets, To Be Well Capitalized, Amount 1,724,632 1,525,635
Tier 1 Capital to Average Assets, To Be Well Capitalized, Amount $ 1,581,985 $ 1,415,029
Total Capital to Risk-Weighted Assets, To Be Well Capitalized, Ratio 10 10
Tier 1 Capital to Risk-Weighted Assets, To Be Well Capitalized, Ratio 8 8
Common Tier I Capital to Risk Weighted Assets, To Be Well Capitalized, Ratio 650.00% 650.00%
Tier 1 Capital to Average Assets To Be Well Capitalized, Ratio 5 5