Name:	ubsi_AnnualIncreaseInGeneralAdvisoryServicesFee
Namespace Prefix:	ubsi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Dollar amount that allows employers to cash out or transfer a former employee's vested retirement account balance without the former employee's consent.

No definition available.

Name:	ubsi_EmployeeBenefitPlanMandatoryCashOutLimit
Namespace Prefix:	ubsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Employee Benefit Plan Participant Advisory Services Fee.

No definition available.

Name:	ubsi_EmployeeBenefitPlanParticipantAdvisoryServicesFee
Namespace Prefix:	ubsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Employee benefit plan participant annual trust fee.

No definition available.

Name:	ubsi_EmployeeBenefitPlanParticipantAnnualTrustFee
Namespace Prefix:	ubsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The age for retirement plan participants to contribute extra money for retirement beyond standard IRS limits.

No definition available.

Name:	ubsi_EmployeeBenefitPlanParticipantCatchUpContributionYearAge
Namespace Prefix:	ubsi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Ongoing administrative charge to cover the paperwork and tracking of a participant's borrowed funds from a retirement plan.

No definition available.

Name:	ubsi_EmployeeBenefitPlanParticipantLoanMaintenanceFee
Namespace Prefix:	ubsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

One-time administrative charge to cover the paperwork and processing of a participant loan from a retirement plan.

No definition available.

Name:	ubsi_EmployeeBenefitPlanParticipantLoanOriginationFee
Namespace Prefix:	ubsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The fee charged to each retirement plan participant to cover the administrative costs of maintaining account balances, processing transactions, and issuing statements.

No definition available.

Name:	ubsi_EmployeeBenefitPlanParticipantRecordKeepingFee
Namespace Prefix:	ubsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Percentage increment that dictates how to divide retirement contributions among different funds.

No definition available.

Name:	ubsi_PercentIncrementForInvestmentElections
Namespace Prefix:	ubsi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-SubTopic 205
-Topic 962
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

Name:	us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Percentage of participant compensation eligible for employer matching contribution for participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

Name:	us-gaap-ebp_EmployeeBenefitPlanEmployerContributionParticipantCompensationMatchedPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Percentage of eligible compensation contributed for participant automatically enrolled in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

Name:	us-gaap-ebp_EmployeeBenefitPlanParticipantContributionAutomaticDeferralRate
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Percentage of maximum pretax annual compensation that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), is permitted to contribute to total pretax annual compensation.