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Deposits - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Deposits [Line Items] |  |  |
Time deposits over $250,000 | $ 1,724,739,000 | $ 1,115,748,000 |
Deposits | 27,060,939,000 | 23,961,859,000 |
Subsidiaries [Member] |  |  |
Deposits [Line Items] |  |  |
Deposits | 32,822,000 | 34,197,000 |
Deposits [Member] |  |  |
Deposits [Line Items] |  |  |
Interest paid | $ 552,108,000 | $ 537,661,000 | $ 377,008,000

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- Definition Deposits [Line Items] + References No definition available. + Details
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Period Type: | duration

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- Definition The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $250,000 or more. + References No definition available. + Details
Name: | ubsi_TimeDeposits250000OrMore
Namespace Prefix: | ubsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(12)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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Period Type: | instant

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- Definition Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-2 + Details
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Period Type: |