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Income Taxes - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Line Items]        
valuation allowance of deferred tax assets $ 0us-gaap_DeferredTaxAssetsValuationAllowance      
General business credit carryforwards 6,900,000us-gaap_TaxCreditCarryforwardAmount      
Alternative minimum tax credits 3,300,000wsbc_AlternativeMinimumTaxCreditCarryforwardAmount      
Federal deferred tax assets net operating loss carryforwards 600,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic      
Qualifying and non-qualifying tax bad debt reserves 15,200,000wsbc_QualifyingAndNonQualifyingTaxBadDebtReserves 15,200,000wsbc_QualifyingAndNonQualifyingTaxBadDebtReserves    
Provision for income taxes 0wsbc_QualifyingAndNonQualifyingTaxBadDebtReservesIncomeTax      
Related amount of unrecognized deferred tax liability 5,600,000us-gaap_DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals 5,600,000us-gaap_DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals    
Federal and state income taxes applicable to securities transactions 300,000wsbc_FederalIncomeTaxExpenseApplicableToSalesAndCallsOfSecurities 200,000wsbc_FederalIncomeTaxExpenseApplicableToSalesAndCallsOfSecurities 900,000wsbc_FederalIncomeTaxExpenseApplicableToSalesAndCallsOfSecurities  
Unrecognized tax benefits and interest 701,000us-gaap_UnrecognizedTaxBenefits 673,000us-gaap_UnrecognizedTaxBenefits 668,000us-gaap_UnrecognizedTaxBenefits 784,000us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that would affect the effective tax rate 700,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate      
Accrued interest related to uncertain tax positions $ 23,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued $ 52,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued    
Earliest Tax Year [Member]        
Income Tax Disclosure [Line Items]        
Earliest year for tax examination 2013