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Condensed Quarterly Statements of Income (Unaudited) - Consolidated Selected Quarterly Statements of Income (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Statement [Abstract]                      
Interest income $ 54,185us-gaap_InterestAndDividendIncomeOperating $ 54,303us-gaap_InterestAndDividendIncomeOperating $ 54,044us-gaap_InterestAndDividendIncomeOperating $ 53,457us-gaap_InterestAndDividendIncomeOperating $ 54,257us-gaap_InterestAndDividendIncomeOperating $ 54,317us-gaap_InterestAndDividendIncomeOperating $ 54,424us-gaap_InterestAndDividendIncomeOperating $ 54,892us-gaap_InterestAndDividendIncomeOperating $ 215,991us-gaap_InterestAndDividendIncomeOperating $ 217,890us-gaap_InterestAndDividendIncomeOperating $ 211,686us-gaap_InterestAndDividendIncomeOperating
Interest expense 5,199us-gaap_InterestExpense 5,692us-gaap_InterestExpense 5,737us-gaap_InterestExpense 6,132us-gaap_InterestExpense 7,019us-gaap_InterestExpense 8,186us-gaap_InterestExpense 8,435us-gaap_InterestExpense 8,764us-gaap_InterestExpense 22,763us-gaap_InterestExpense 32,403us-gaap_InterestExpense 43,335us-gaap_InterestExpense
Net interest income 48,986us-gaap_InterestIncomeExpenseNet 48,611us-gaap_InterestIncomeExpenseNet 48,307us-gaap_InterestIncomeExpenseNet 47,325us-gaap_InterestIncomeExpenseNet 47,238us-gaap_InterestIncomeExpenseNet 46,131us-gaap_InterestIncomeExpenseNet 45,989us-gaap_InterestIncomeExpenseNet 46,128us-gaap_InterestIncomeExpenseNet 193,228us-gaap_InterestIncomeExpenseNet 185,487us-gaap_InterestIncomeExpenseNet 168,351us-gaap_InterestIncomeExpenseNet
Provision for credit losses 1,880us-gaap_ProvisionForLoanLeaseAndOtherLosses 1,478us-gaap_ProvisionForLoanLeaseAndOtherLosses 849us-gaap_ProvisionForLoanLeaseAndOtherLosses 2,199us-gaap_ProvisionForLoanLeaseAndOtherLosses 3,144us-gaap_ProvisionForLoanLeaseAndOtherLosses 2,819us-gaap_ProvisionForLoanLeaseAndOtherLosses 1,021us-gaap_ProvisionForLoanLeaseAndOtherLosses 2,102us-gaap_ProvisionForLoanLeaseAndOtherLosses 6,405us-gaap_ProvisionForLoanLeaseAndOtherLosses 9,086us-gaap_ProvisionForLoanLeaseAndOtherLosses 19,874us-gaap_ProvisionForLoanLeaseAndOtherLosses
Net interest income after provision for credit losses 47,106us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 47,133us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 47,458us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 45,126us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 44,094us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 43,312us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 44,968us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 44,026us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 186,823us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 176,401us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 148,477us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
Non-interest income 16,413wsbc_NoninterestIncomeExcludingNetSecuritiesGains 16,073wsbc_NoninterestIncomeExcludingNetSecuritiesGains 18,076wsbc_NoninterestIncomeExcludingNetSecuritiesGains 17,039wsbc_NoninterestIncomeExcludingNetSecuritiesGains 16,953wsbc_NoninterestIncomeExcludingNetSecuritiesGains 17,131wsbc_NoninterestIncomeExcludingNetSecuritiesGains 17,038wsbc_NoninterestIncomeExcludingNetSecuritiesGains 17,480wsbc_NoninterestIncomeExcludingNetSecuritiesGains 67,601wsbc_NoninterestIncomeExcludingNetSecuritiesGains 68,601wsbc_NoninterestIncomeExcludingNetSecuritiesGains  
Net securities gains 147us-gaap_GainLossOnInvestments 581us-gaap_GainLossOnInvestments 165us-gaap_GainLossOnInvestments 10us-gaap_GainLossOnInvestments (3)us-gaap_GainLossOnInvestments (15)us-gaap_GainLossOnInvestments 686us-gaap_GainLossOnInvestments 16us-gaap_GainLossOnInvestments 903us-gaap_GainLossOnInvestments 684us-gaap_GainLossOnInvestments 2,463us-gaap_GainLossOnInvestments
Non-interest expense 41,972us-gaap_NoninterestExpense 39,263us-gaap_NoninterestExpense 40,304us-gaap_NoninterestExpense 40,095us-gaap_NoninterestExpense 40,743us-gaap_NoninterestExpense 40,009us-gaap_NoninterestExpense 39,499us-gaap_NoninterestExpense 40,747us-gaap_NoninterestExpense 161,633us-gaap_NoninterestExpense 160,998us-gaap_NoninterestExpense 150,120us-gaap_NoninterestExpense
Income before provision for income taxes 21,694us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 24,524us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 25,395us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 22,080us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 20,301us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 20,419us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 23,193us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 20,775us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 93,694us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 84,688us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 63,132us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes 5,182us-gaap_IncomeTaxExpenseBenefit 6,358us-gaap_IncomeTaxExpenseBenefit 6,520us-gaap_IncomeTaxExpenseBenefit 5,659us-gaap_IncomeTaxExpenseBenefit 4,948us-gaap_IncomeTaxExpenseBenefit 4,884us-gaap_IncomeTaxExpenseBenefit 6,176us-gaap_IncomeTaxExpenseBenefit 4,754us-gaap_IncomeTaxExpenseBenefit 23,720us-gaap_IncomeTaxExpenseBenefit 20,763us-gaap_IncomeTaxExpenseBenefit 13,588us-gaap_IncomeTaxExpenseBenefit
Net income $ 16,512us-gaap_NetIncomeLoss $ 18,166us-gaap_NetIncomeLoss $ 18,875us-gaap_NetIncomeLoss $ 16,421us-gaap_NetIncomeLoss $ 15,353us-gaap_NetIncomeLoss $ 15,535us-gaap_NetIncomeLoss $ 17,017us-gaap_NetIncomeLoss $ 16,021us-gaap_NetIncomeLoss $ 69,974us-gaap_NetIncomeLoss $ 63,925us-gaap_NetIncomeLoss $ 49,544us-gaap_NetIncomeLoss
Earnings per common share - basic $ 0.56us-gaap_EarningsPerShareBasic $ 0.62us-gaap_EarningsPerShareBasic $ 0.65us-gaap_EarningsPerShareBasic $ 0.56us-gaap_EarningsPerShareBasic $ 0.52us-gaap_EarningsPerShareBasic $ 0.53us-gaap_EarningsPerShareBasic $ 0.58us-gaap_EarningsPerShareBasic $ 0.55us-gaap_EarningsPerShareBasic $ 2.39us-gaap_EarningsPerShareBasic $ 2.18us-gaap_EarningsPerShareBasic $ 1.84us-gaap_EarningsPerShareBasic
Earnings per common share - diluted $ 0.56us-gaap_EarningsPerShareDiluted $ 0.62us-gaap_EarningsPerShareDiluted $ 0.64us-gaap_EarningsPerShareDiluted $ 0.56us-gaap_EarningsPerShareDiluted $ 0.52us-gaap_EarningsPerShareDiluted $ 0.53us-gaap_EarningsPerShareDiluted $ 0.58us-gaap_EarningsPerShareDiluted $ 0.55us-gaap_EarningsPerShareDiluted $ 2.39us-gaap_EarningsPerShareDiluted $ 2.18us-gaap_EarningsPerShareDiluted $ 1.84us-gaap_EarningsPerShareDiluted