Commitments and Contingent Liabilities (Details) (Textual) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Commitments and Contingent Liabilities (Textual) [Abstract]
Allowance for credit losses associated with loan commitments	$ 0.4	$ 0.5
Estimated fair value of standby letters of credit	$ 0.1	$ 0.1

Allowance for credit losses associated with loan commitments.

No definition available.

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