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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Comprehensive Income [Abstract]      
Net income $ 69,974us-gaap_NetIncomeLoss $ 63,925us-gaap_NetIncomeLoss $ 49,544us-gaap_NetIncomeLoss
Securities available-for-sale:      
Net change in unrealized gains (losses) on securities available-for-sale 15,242us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax (30,288)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax 4,833us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Related income tax (expense) benefit (5,604)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax 11,186us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax (1,747)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Net securities gains reclassified into earnings (981)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax (89)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax (2,142)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Related income tax expense 361us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax 33us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax 796us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Net effect on other comprehensive income for the period 9,018us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax (19,158)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 1,740us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Securities held-to-maturity:      
Amortization of unrealized gain transferred from available-for-sale (472)wsbc_OtherComprehensiveIncomeAmortizationOfUnrealizedHoldingGainLossPreviouslyRecognizedInOtherComprehensiveIncomeBeforeTax (1,029)wsbc_OtherComprehensiveIncomeAmortizationOfUnrealizedHoldingGainLossPreviouslyRecognizedInOtherComprehensiveIncomeBeforeTax (1,534)wsbc_OtherComprehensiveIncomeAmortizationOfUnrealizedHoldingGainLossPreviouslyRecognizedInOtherComprehensiveIncomeBeforeTax
Related income tax expense 173wsbc_OtherComprehensiveIncomeAmortizationOfUnrealizedHoldingGainLossPreviouslyRecognizedInOtherComprehensiveIncomeTax 383wsbc_OtherComprehensiveIncomeAmortizationOfUnrealizedHoldingGainLossPreviouslyRecognizedInOtherComprehensiveIncomeTax 577wsbc_OtherComprehensiveIncomeAmortizationOfUnrealizedHoldingGainLossPreviouslyRecognizedInOtherComprehensiveIncomeTax
Net effect on other comprehensive income for the period (299)wsbc_OtherComprehensiveIncomeLossHeldToMaturitySecuritiesAdjustmentNetOfTax (646)wsbc_OtherComprehensiveIncomeLossHeldToMaturitySecuritiesAdjustmentNetOfTax (957)wsbc_OtherComprehensiveIncomeLossHeldToMaturitySecuritiesAdjustmentNetOfTax
Defined benefit pension plan:      
Amortization of net loss and prior service costs 1,516us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax 3,579us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax 2,332us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
Related income tax benefit (558)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax (1,368)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax (918)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax
Recognition of unrealized (loss) gain (24,934)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax 17,751us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax (12,143)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax
Related income tax benefit (expense) 9,166us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax (6,527)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax 4,483us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax
Net effect on other comprehensive income for the period (14,810)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 13,435us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax (6,246)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Total other comprehensive income (6,091)us-gaap_OtherComprehensiveIncomeLossNetOfTax (6,369)us-gaap_OtherComprehensiveIncomeLossNetOfTax (5,463)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income $ 63,883us-gaap_ComprehensiveIncomeNetOfTax $ 57,556us-gaap_ComprehensiveIncomeNetOfTax $ 44,081us-gaap_ComprehensiveIncomeNetOfTax