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Consolidated Statements of Cash Flows (Parenthetical) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Cash Flows [Abstract]      
Fair value of tangible assets acquired in cash $ 0wsbc_CashReceivedInAcquisition $ 0wsbc_CashReceivedInAcquisition $ 26.4wsbc_CashReceivedInAcquisition