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Fair Values Of Assets and Liabilities (Schedule Of Valuation Techniques And Significant Unobservable Inputs Used To Measure Both Recurring And Non-Recurring) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Available-for-sale securities, at fair value $ 1,721,030us-gaap_AvailableForSaleSecurities $ 1,792,078us-gaap_AvailableForSaleSecurities $ 1,949,697us-gaap_AvailableForSaleSecurities
Impaired Financing Receivable, Recorded Investment 112,404us-gaap_ImpairedFinancingReceivableRecordedInvestment [1] 127,412us-gaap_ImpairedFinancingReceivableRecordedInvestment [1] 142,977us-gaap_ImpairedFinancingReceivableRecordedInvestment [1]
Municipal      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Available-for-sale securities, at fair value 269,912us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember		 238,529us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember		 175,300us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
Equity securities      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Available-for-sale securities, at fair value 54,446us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		 51,139us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		 53,574us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Fair Value, Measurements, Recurring [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Mortgage servicing rights 7,852us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 8,435us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 8,719us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Fair Value, Measurements, Recurring [Member] | Municipal      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Available-for-sale securities, at fair value 269,912us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember		 238,529us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember		 175,300us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
Fair Value, Measurements, Recurring [Member] | Equity securities      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Available-for-sale securities, at fair value 54,446us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		 51,139us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		 53,574us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Fair Value, Measurements, Nonrecurring [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Other real estate owned 81,042us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2]    
Impaired Financing Receivable, Recorded Investment 69,002us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		    
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Mortgage servicing rights 7,852us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 8,435us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 8,719us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage Servicing Rights [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Valuation Methodology Discounted cash flows    
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage Servicing Rights [Member] | Minimum [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Discount Rate 9.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= wtfc_MortgageServicingRightsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Fair Value Inputs, Prepayment Rate 11.00%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FairValueByAssetClassAxis
= wtfc_MortgageServicingRightsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage Servicing Rights [Member] | Maximum [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Discount Rate 12.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= wtfc_MortgageServicingRightsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Fair Value Inputs, Prepayment Rate 20.00%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FairValueByAssetClassAxis
= wtfc_MortgageServicingRightsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage Servicing Rights Discount Rate Input [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Significant Unobservable Input Discount rate    
Range of Inputs 9%-12%    
Weighted Average of Inputs 9.15%wtfc_LevelThreeFairValueMeasurementsWeightedAveragePercentage
/ us-gaap_FairValueByAssetClassAxis
= wtfc_MortgageServicingRightsDiscountRateInputMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		    
Impact to valuation from an increased or higher input value Decrease    
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage Servicing Rights Prepayment Rate Input [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Significant Unobservable Input Constant prepayment rate (CPR)    
Range of Inputs 11%-20%    
Weighted Average of Inputs 13.29%wtfc_LevelThreeFairValueMeasurementsWeightedAveragePercentage
/ us-gaap_FairValueByAssetClassAxis
= wtfc_MortgageServicingRightsPrepaymentRateInputMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		    
Impact to valuation from an increased or higher input value Decrease    
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Municipal      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Available-for-sale securities, at fair value 56,049us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember		 58,953us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember		 39,772us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
Valuation Methodology Bond pricing    
Significant Unobservable Input Equivalent rating    
Range of Inputs BBB-AA+    
Impact to valuation from an increased or higher input value Increase    
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Available-for-sale securities, at fair value 24,656us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		 23,711us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		 23,438us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Valuation Methodology Discounted cash flows    
Significant Unobservable Input Discount rate    
Range of Inputs 1.70%-2.34%    
Weighted Average of Inputs 2.04%wtfc_LevelThreeFairValueMeasurementsWeightedAveragePercentage
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		    
Impact to valuation from an increased or higher input value Decrease    
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities | Minimum [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Discount Rate 1.70%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities | Maximum [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Discount Rate 2.34%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Other real estate owned 81,042us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2]    
Impaired Financing Receivable, Recorded Investment $ 69,002us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		    
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Valuation Methodology Appraisal value    
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Valuation Methodology Appraisal value    
Significant Unobservable Input Property specific valuation adjustment    
Range of Inputs (79)%-154%    
Weighted Average of Inputs (1.76%)wtfc_LevelThreeFairValueMeasurementsWeightedAveragePercentage
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ wtfc_ImpairedFinancingReceivableByTypeAxis
= wtfc_OtherRealEstateOwnedMember		    
Impact to valuation from an increased or higher input value Increase    
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned [Member] | Minimum [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Property Specific Valuation Adjustment (79.00%)wtfc_FairValueInputsPropertySpecificValuationAdjustment
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ wtfc_ImpairedFinancingReceivableByTypeAxis
= wtfc_OtherRealEstateOwnedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned [Member] | Maximum [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Property Specific Valuation Adjustment 154.00%wtfc_FairValueInputsPropertySpecificValuationAdjustment
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ wtfc_ImpairedFinancingReceivableByTypeAxis
= wtfc_OtherRealEstateOwnedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
[1] Impaired loans are considered by the Company to be non-accrual loans, TDRs or loans with principal and/or interest at risk, even if the loan is current with all payments of principal and interest.
[2] Fair value losses recognized, net on other real estate owned include valuation adjustments and charge-offs during the respective period.