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Commitments and Contingent Liabilities - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Allowance for credit losses associated with loan commitments	$ 7.6	$ 6.1
Liability associated with letters of credit	$ 0.4	$ 0.2

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- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

+ Details

Name:	us-gaap_GuaranteeObligationsCurrentCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Amount of allowance to cover probable credit losses on loan commitments.

+ References

No definition available.

+ Details

Name:	wsbc_AllowanceForLoanCommitments
Namespace Prefix:	wsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant