Fair Value Measurement (Details Textual) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair Value Measurement (Textual) [Abstract]
Mortgage-backed securities of government agencies classified as available for sale	$ 41.2	$ 45.8

Mortgage-backed securities of government agencies classified as available for sale.

No definition available.

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