Capitalized right of use asset and lease liabilities to be regcognize upon adoption of ASU.

No definition available.

Name:	wsbc_CapitalizedRightOfUseAssetAndLeaseLiabilitiesToBeRegcognizeUponAdoptionOfASU
Namespace Prefix:	wsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Jan. 01, 2019
Summary Of Significant Accounting Policies [Line Items]
Capitalized right of use asset and lease liabilities to be regcognize upon adoption of ASU	$ 20.0
Municipal Debt Securities [Member] \| Accounting Standards Update 2017-12 [Member]
Summary Of Significant Accounting Policies [Line Items]
Reclassification of callable held-to-maturity securities		$ 67.3