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Regulatory Matters - Capital Amounts and Ratios (Detail) $ in Thousands | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
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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

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