$WTFC
WINTRUST FINANCIAL CORP Stock $wtfc

$wtfc Overview Financials Valuation SEC Filings Company Website

2024 Q2 Form 10-Q Financial Statement

#000101532824000143 Filed on May 09, 2024

Income Statement

Concept	2024 Q2	2024 Q1
Revenue	$591.8M	$604.8M
YoY Change	5.56%	6.9%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$23.68M	$21.46M
YoY Change	46.17%	14.18%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$379.4M	$341.3M
YoY Change	51.97%	87.85%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$211.3M	$250.0M
YoY Change	-0.04%	2.63%
Income Tax	$58.96M	$62.66M
% Of Pretax Income	27.9%	25.07%
Net Earnings	$145.4M	$180.3M
YoY Change	-1.6%	4.1%
Net Earnings / Revenue	24.57%	29.81%
Basic Earnings Per Share	$2.35	$2.93
Diluted Earnings Per Share	$2.32	$2.89
COMMON SHARES
Basic Shares Outstanding	61.75M shares	61.47M shares
Diluted Shares Outstanding	62.77M shares	62.41M shares

Balance Sheet

Concept	2024 Q2	2024 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$415.5M	$379.9M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$722.3M	$744.8M
YoY Change	-3.62%	-2.04%
Goodwill	$656.0M	$656.2M
YoY Change	-0.11%	0.4%
Intangibles	$20.61M	$21.73M
YoY Change	-19.67%	3.72%
Long-Term Investments
YoY Change
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$59.78B	$57.58B
YoY Change	10.12%	8.9%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$1.861B	$1.748B
YoY Change	2.1%	12.84%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$10.87M
YoY Change	-100.0%	7.36%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$1.861B	$1.748B
YoY Change	2.1%	12.84%
LONG-TERM LIABILITIES
Long-Term Debt	$1.158B	$1.267B
YoY Change	-14.61%	-0.6%
Other Long-Term Liabilities
YoY Change
Total Long-Term Liabilities	$1.158B	$1.267B
YoY Change	-14.61%	-0.6%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.861B	$1.748B
Total Long-Term Liabilities	$1.158B	$1.267B
Total Liabilities	$54.24B	$52.14B
YoY Change	10.15%	8.95%
SHAREHOLDERS EQUITY
Retained Earnings	$3.616B	$3.498B
YoY Change	15.86%	16.72%
Common Stock	$61.83M	$61.80M
YoY Change	0.99%	0.98%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$5.537B	$5.436B
YoY Change
Total Liabilities & Shareholders Equity	$59.78B	$57.58B
YoY Change	10.12%	8.9%

Cashflow Statement

Concept	2024 Q2	2024 Q1
OPERATING ACTIVITIES
Net Income	$145.4M	$180.3M
YoY Change	-1.6%	4.1%
Depreciation, Depletion And Amortization	$23.68M	$21.46M
YoY Change	46.17%	14.18%
Cash From Operating Activities	$221.2M	$71.13M
YoY Change	-34.88%	3.92%
INVESTING ACTIVITIES
Capital Expenditures	$39.16M	$10.60M
YoY Change	21777.09%	15.98%
Acquisitions
YoY Change
Other Investing Activities	-$2.106B	-$1.409B
YoY Change	56.5%	-1240.0%
Cash From Investing Activities	-$2.145B	-$1.419B
YoY Change	59.39%	-1340.32%
FINANCING ACTIVITIES
Cash Dividend Paid		$34.22M
YoY Change		8.98%
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	1.960B	$1.304B
YoY Change	82.44%	-672.53%
NET CHANGE
Cash From Operating Activities	221.2M	$71.13M
Cash From Investing Activities	-2.145B	-$1.419B
Cash From Financing Activities	1.960B	$1.304B
Net Change In Cash	35.64M	-$43.58M
YoY Change	-47.54%	-3.12%
FREE CASH FLOW
Cash From Operating Activities	$221.2M	$71.13M
Capital Expenditures	$39.16M	$10.60M
Free Cash Flow	$182.1M	$60.53M
YoY Change	-46.38%	2.06%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2024Q1	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	6991000	usd
CY2023Q1	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	6991000	usd
CY2024Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	180303000	usd
CY2023Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	173207000	usd
CY2023Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.84
CY2022	us-gaap	Accounting Standards Update Extensible List AccountingStandardsUpdateExtensibleList	http://fasb.org/us-gaap/2023#AccountingStandardsUpdate202202Member
CY2023Q4	us-gaap	Financial Asset Amortized Cost Accrued Interest After Allowance For Credit Loss Statement Of Financial Position Extensible List FinancialAssetAmortizedCostAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#InterestReceivableAndOtherAssets
CY2023Q1	us-gaap	Financial Asset Amortized Cost Accrued Interest After Allowance For Credit Loss Statement Of Financial Position Extensible List FinancialAssetAmortizedCostAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#InterestReceivableAndOtherAssets
CY2024Q1	us-gaap	Financial Asset Amortized Cost Accrued Interest After Allowance For Credit Loss Statement Of Financial Position Extensible List FinancialAssetAmortizedCostAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#InterestReceivableAndOtherAssets
CY2024Q1	us-gaap	Interest And Fee Income Loans Held For Sale Mortgages InterestAndFeeIncomeLoansHeldForSaleMortgages	4146000	usd
CY2023Q1	us-gaap	Interest And Fee Income Loans Held For Sale Mortgages InterestAndFeeIncomeLoansHeldForSaleMortgages	3528000	usd
CY2024Q1	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	16658000	usd
CY2023Q1	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	13468000	usd
CY2024Q1	us-gaap	Interest Income Federal Funds Sold And Securities Purchased Under Agreements To Resell InterestIncomeFederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResell	19000	usd
CY2023Q1	us-gaap	Interest Income Federal Funds Sold And Securities Purchased Under Agreements To Resell InterestIncomeFederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResell	70000	usd
CY2024Q1	us-gaap	Interest And Dividend Income Securities Other InterestAndDividendIncomeSecuritiesOther	69678000	usd
CY2023Q1	us-gaap	Interest And Dividend Income Securities Other InterestAndDividendIncomeSecuritiesOther	59943000	usd
CY2024Q1	us-gaap	Interest Income Debt Securities Trading Operating InterestIncomeDebtSecuritiesTradingOperating	18000	usd
CY2023Q1	us-gaap	Interest Income Debt Securities Trading Operating InterestIncomeDebtSecuritiesTradingOperating	14000	usd
CY2024Q1	wtfc	Interest Income Federal Home Loan Banks And Federal Reserve Bank Stock InterestIncomeFederalHomeLoanBanksAndFederalReserveBankStock	4478000	usd
CY2023Q1	wtfc	Interest Income Federal Home Loan Banks And Federal Reserve Bank Stock InterestIncomeFederalHomeLoanBanksAndFederalReserveBankStock	3680000	usd
CY2024Q1	wtfc	Interest Income Brokerage Customer Receivables InterestIncomeBrokerageCustomerReceivables	175000	usd
CY2023Q1	wtfc	Interest Income Brokerage Customer Receivables InterestIncomeBrokerageCustomerReceivables	295000	usd
CY2024Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	805513000	usd
CY2023Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	639690000	usd
CY2024Q1	us-gaap	Interest Expense Deposits InterestExpenseDeposits	299532000	usd
CY2023Q1	us-gaap	Interest Expense Deposits InterestExpenseDeposits	144802000	usd
CY2024Q1	us-gaap	Interest Expense Federal Home Loan Bank And Federal Reserve Bank Advances Long Term InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm	22048000	usd
CY2023Q1	us-gaap	Interest Expense Federal Home Loan Bank And Federal Reserve Bank Advances Long Term InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm	19135000	usd
CY2024Q1	us-gaap	Interest Expense Other Long Term Debt InterestExpenseOtherLongTermDebt	9248000	usd
CY2023Q1	us-gaap	Interest Expense Other Long Term Debt InterestExpenseOtherLongTermDebt	7854000	usd
CY2024Q1	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	5487000	usd
CY2023Q1	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	5488000	usd
CY2024Q1	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	5004000	usd
CY2023Q1	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	4416000	usd
CY2024Q1	us-gaap	Interest Expense InterestExpense	341319000	usd
CY2023Q1	us-gaap	Interest Expense InterestExpense	181695000	usd
CY2024Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	464194000	usd
CY2023Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	457995000	usd
CY2024Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	21673000	usd
CY2023Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	23045000	usd
CY2024Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	442521000	usd
CY2023Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	434950000	usd
CY2024Q1	wtfc	Revenues Wealth Management RevenuesWealthManagement	34815000	usd
CY2023Q1	wtfc	Revenues Wealth Management RevenuesWealthManagement	29945000	usd
CY2024Q1	wtfc	Revenues Mortgage Banking RevenuesMortgageBanking	27663000	usd
CY2023Q1	wtfc	Revenues Mortgage Banking RevenuesMortgageBanking	18264000	usd
CY2024Q1	wtfc	Revenues Service Charges RevenuesServiceCharges	14811000	usd
CY2023Q1	wtfc	Revenues Service Charges RevenuesServiceCharges	12903000	usd
CY2024Q1	wtfc	Marketable Securities Gain Loss Including Other Than Temporary Impairment Loss MarketableSecuritiesGainLossIncludingOtherThanTemporaryImpairmentLoss	1326000	usd
CY2023Q1	wtfc	Marketable Securities Gain Loss Including Other Than Temporary Impairment Loss MarketableSecuritiesGainLossIncludingOtherThanTemporaryImpairmentLoss	1398000	usd
CY2024Q1	wtfc	Fees From Covered Call Options FeesFromCoveredCallOptions	4847000	usd
CY2023Q1	wtfc	Fees From Covered Call Options FeesFromCoveredCallOptions	10391000	usd
CY2024Q1	us-gaap	Trading Gains Losses TradingGainsLosses	677000	usd
CY2023Q1	us-gaap	Trading Gains Losses TradingGainsLosses	813000	usd
CY2024Q1	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	14110000	usd
CY2023Q1	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	13046000	usd
CY2024Q1	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	42331000	usd
CY2023Q1	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	21009000	usd
CY2024Q1	us-gaap	Noninterest Income NoninterestIncome	140580000	usd
CY2023Q1	us-gaap	Noninterest Income NoninterestIncome	107769000	usd
CY2024Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	195173000	usd
CY2023Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	176781000	usd
CY2024Q1	us-gaap	Equipment Expense EquipmentExpense	27731000	usd
CY2023Q1	us-gaap	Equipment Expense EquipmentExpense	24697000	usd
CY2024Q1	wtfc	Lessor Operating Lease Depreciation And Impairment Expense LessorOperatingLeaseDepreciationAndImpairmentExpense	10683000	usd
CY2023Q1	wtfc	Lessor Operating Lease Depreciation And Impairment Expense LessorOperatingLeaseDepreciationAndImpairmentExpense	9833000	usd
CY2024Q1	us-gaap	Occupancy Net OccupancyNet	19086000	usd
CY2023Q1	us-gaap	Occupancy Net OccupancyNet	18486000	usd
CY2024Q1	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	9292000	usd
CY2023Q1	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	9409000	usd
CY2024Q1	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	13040000	usd
CY2023Q1	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	11946000	usd
CY2024Q1	us-gaap	Professional Fees ProfessionalFees	9553000	usd
CY2023Q1	us-gaap	Professional Fees ProfessionalFees	8163000	usd
CY2024Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1158000	usd
CY2023Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1235000	usd
CY2024Q1	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	14537000	usd
CY2023Q1	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	8669000	usd
CY2024Q1	us-gaap	Other Revenue Expense From Real Estate Operations OtherRevenueExpenseFromRealEstateOperations	-392000	usd
CY2023Q1	us-gaap	Other Revenue Expense From Real Estate Operations OtherRevenueExpenseFromRealEstateOperations	207000	usd
CY2024Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	32500000	usd
CY2023Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	30157000	usd
CY2024Q1	us-gaap	Noninterest Expense NoninterestExpense	333145000	usd
CY2023Q1	us-gaap	Noninterest Expense NoninterestExpense	299169000	usd
CY2024Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	249956000	usd
CY2023Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	243550000	usd
CY2024Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	62662000	usd
CY2023Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	63352000	usd
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	187294000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	180198000	usd
CY2024Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.93
CY2024Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.89
CY2023Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.80
CY2024Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.45
CY2023Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.40
CY2024Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	61481000	shares
CY2023Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	60950000	shares
CY2024Q1	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	928000	shares
CY2023Q1	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	873000	shares
CY2024Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	62409000	shares
CY2023Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	61823000	shares
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	187294000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	180198000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-77888000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	47040000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-20601000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	12537000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-57287000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	34503000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-26000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	560000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-7000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	151000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-19000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	409000	usd
CY2024Q1	wtfc	Other Comprehensive Income Loss Securities Transferred From Available For Sale To Held To Maturity Adjustment Before Tax OtherComprehensiveIncomeLossSecuritiesTransferredFromAvailableForSaleToHeldToMaturityAdjustmentBeforeTax	50000	usd
CY2023Q1	wtfc	Other Comprehensive Income Loss Securities Transferred From Available For Sale To Held To Maturity Adjustment Before Tax OtherComprehensiveIncomeLossSecuritiesTransferredFromAvailableForSaleToHeldToMaturityAdjustmentBeforeTax	43000	usd
CY2024Q1	wtfc	Other Comprehensive Income Loss Securities Transferred From Available For Sale To Held To Maturity Adjustment Tax Effect OtherComprehensiveIncomeLossSecuritiesTransferredFromAvailableForSaleToHeldToMaturityAdjustmentTaxEffect	13000	usd
CY2023Q1	wtfc	Other Comprehensive Income Loss Securities Transferred From Available For Sale To Held To Maturity Adjustment Tax Effect OtherComprehensiveIncomeLossSecuritiesTransferredFromAvailableForSaleToHeldToMaturityAdjustmentTaxEffect	11000	usd
CY2024Q1	wtfc	Other Comprehensive Income Loss Securities Transferred From Available For Sale To Held To Maturity Adjustment Net Of Tax OtherComprehensiveIncomeLossSecuritiesTransferredFromAvailableForSaleToHeldToMaturityAdjustmentNetOfTax	37000	usd
CY2023Q1	wtfc	Other Comprehensive Income Loss Securities Transferred From Available For Sale To Held To Maturity Adjustment Net Of Tax OtherComprehensiveIncomeLossSecuritiesTransferredFromAvailableForSaleToHeldToMaturityAdjustmentNetOfTax	32000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-57305000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	34062000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax	-82091000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax	34666000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	-21713000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	9238000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-60378000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	25428000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-7649000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	890000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	-1415000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	180000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-6234000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	710000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-123917000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	60200000	usd
CY2024Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	63377000	usd
CY2023Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	240398000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	4796838000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	180198000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	60200000	usd
CY2023Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.40
CY2023Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	24407000	usd
CY2023Q1	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	6991000	usd
CY2023Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	8295000	usd
CY2023Q1	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	2216000	usd
CY2023Q1	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	-1662000	usd
CY2023Q1	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	694000	usd
CY2023Q1	us-gaap	Stock Issued During Period Value Issued For Services StockIssuedDuringPeriodValueIssuedForServices	669000	usd
CY2023Q1	us-gaap	Stockholders Equity StockholdersEquity	5015506000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	5399526000	usd
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	187294000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-123917000	usd
CY2024Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.45
CY2024Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	27227000	usd
CY2024Q1	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	6991000	usd
CY2024Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	9157000	usd
CY2024Q1	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	25000	usd
CY2024Q1	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	-3504000	usd
CY2024Q1	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	741000	usd
CY2024Q1	us-gaap	Stock Issued During Period Value Issued For Services StockIssuedDuringPeriodValueIssuedForServices	1296000	usd
CY2024Q1	us-gaap	Stockholders Equity StockholdersEquity	5436400000	usd
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	187294000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	180198000	usd
CY2024Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	21673000	usd
CY2023Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	23045000	usd
CY2024Q1	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	21464000	usd
CY2023Q1	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	18798000	usd
CY2024Q1	us-gaap	Share Based Compensation ShareBasedCompensation	9157000	usd
CY2023Q1	us-gaap	Share Based Compensation ShareBasedCompensation	8295000	usd
CY2024Q1	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-190000	usd
CY2023Q1	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-275000	usd
CY2024Q1	wtfc	Accretion Amortization Of Discounts And Premiums On Loans AccretionAmortizationOfDiscountsAndPremiumsOnLoans	3601000	usd
CY2023Q1	wtfc	Accretion Amortization Of Discounts And Premiums On Loans AccretionAmortizationOfDiscountsAndPremiumsOnLoans	4263000	usd
CY2024Q1	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	-3210000	usd
CY2023Q1	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	10863000	usd
CY2024Q1	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-1985000	usd
CY2023Q1	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	2805000	usd
CY2024Q1	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	475613000	usd
CY2023Q1	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	366006000	usd
CY2024Q1	wtfc	Early Buyout Exercises Of Guaranteed Mortgage Loans Held For Sale EarlyBuyoutExercisesOfGuaranteedMortgageLoansHeldForSale	16562000	usd
CY2023Q1	wtfc	Early Buyout Exercises Of Guaranteed Mortgage Loans Held For Sale EarlyBuyoutExercisesOfGuaranteedMortgageLoansHeldForSale	6334000	usd
CY2024Q1	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	446262000	usd
CY2023Q1	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	366509000	usd
CY2024Q1	wtfc	Gain Loss On Bank Owned Life Insurance Net Of Claims GainLossOnBankOwnedLifeInsuranceNetOfClaims	1651000	usd
CY2023Q1	wtfc	Gain Loss On Bank Owned Life Insurance Net Of Claims GainLossOnBankOwnedLifeInsuranceNetOfClaims	-1351000	usd
CY2024Q1	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	-2523000	usd
CY2023Q1	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	-1025000	usd
CY2024Q1	us-gaap	Increase Decrease In Broker Dealer Related Receivables Payables Net IncreaseDecreaseInBrokerDealerRelatedReceivablesPayablesNet	2790000	usd
CY2023Q1	us-gaap	Increase Decrease In Broker Dealer Related Receivables Payables Net IncreaseDecreaseInBrokerDealerRelatedReceivablesPayablesNet	-345000	usd
CY2024Q1	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	12000000	usd
CY2023Q1	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	10795000	usd
CY2024Q1	us-gaap	Gain Loss On Investments GainLossOnInvestments	1326000	usd
CY2023Q1	us-gaap	Gain Loss On Investments GainLossOnInvestments	1398000	usd
CY2024Q1	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	146000	usd
CY2023Q1	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-93000	usd
CY2024Q1	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-207000	usd
CY2023Q1	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-99000	usd
CY2024Q1	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	40478000	usd
CY2023Q1	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	97024000	usd
CY2024Q1	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-62253000	usd
CY2023Q1	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-53830000	usd
CY2024Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	71125000	usd
CY2023Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	68441000	usd
CY2024Q1	wtfc	Proceeds From Sale And Calls Of Debt Securities Available For Sale ProceedsFromSaleAndCallsOfDebtSecuritiesAvailableForSale	690866000	usd
CY2023Q1	wtfc	Proceeds From Sale And Calls Of Debt Securities Available For Sale ProceedsFromSaleAndCallsOfDebtSecuritiesAvailableForSale	934554000	usd
CY2024Q1	wtfc	Proceeds From Maturities Of Debt Securities Available For Sale ProceedsFromMaturitiesOfDebtSecuritiesAvailableForSale	82418000	usd
CY2023Q1	wtfc	Proceeds From Maturities Of Debt Securities Available For Sale ProceedsFromMaturitiesOfDebtSecuritiesAvailableForSale	74043000	usd
CY2024Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	46588000	usd
CY2023Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	40342000	usd
CY2024Q1	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	45000000	usd
CY2023Q1	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	23592000	usd
CY2024Q1	wtfc	Proceeds From Sales And Capital Distributions Of Equity Securities Without Readily Determinable Fair Value ProceedsFromSalesAndCapitalDistributionsOfEquitySecuritiesWithoutReadilyDeterminableFairValue	2226000	usd
CY2023Q1	wtfc	Proceeds From Sales And Capital Distributions Of Equity Securities Without Readily Determinable Fair Value ProceedsFromSalesAndCapitalDistributionsOfEquitySecuritiesWithoutReadilyDeterminableFairValue	67000	usd
CY2024Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1045047000	usd
CY2023Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	996433000	usd
CY2024Q1	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	0	usd
CY2023Q1	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	6443000	usd
CY2024Q1	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	24000000	usd
CY2023Q1	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	23697000	usd
CY2024Q1	wtfc	Payments To Acquire Equity Securities Without Readily Determinable Fair Value PaymentsToAcquireEquitySecuritiesWithoutReadilyDeterminableFairValue	2900000	usd
CY2023Q1	wtfc	Payments To Acquire Equity Securities Without Readily Determinable Fair Value PaymentsToAcquireEquitySecuritiesWithoutReadilyDeterminableFairValue	4850000	usd
CY2024Q1	wtfc	Payments For Proceeds From Federal Home Loan And Federal Reserve Bank Stock PaymentsForProceedsFromFederalHomeLoanAndFederalReserveBankStock	19654000	usd
CY2023Q1	wtfc	Payments For Proceeds From Federal Home Loan And Federal Reserve Bank Stock PaymentsForProceedsFromFederalHomeLoanAndFederalReserveBankStock	-20198000	usd
CY2024Q1	us-gaap	Payments For Proceeds From Limited Partnership PaymentsForProceedsFromLimitedPartnership	-242000	usd
CY2023Q1	us-gaap	Payments For Proceeds From Limited Partnership PaymentsForProceedsFromLimitedPartnership	-2794000	usd
CY2024Q1	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	0	usd
CY2023Q1	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	435000	usd
CY2024Q1	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	-49062000	usd
CY2023Q1	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	424842000	usd
CY2024Q1	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	1135248000	usd
CY2023Q1	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	365885000	usd
CY2024Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	10599000	usd
CY2023Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	9139000	usd
CY2024Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1419170000	usd
CY2023Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	114420000	usd
CY2024Q1	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	1051686000	usd
CY2023Q1	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-184335000	usd
CY2024Q1	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	-62239000	usd
CY2023Q1	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	-13968000	usd
CY2024Q1	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	350680000	usd
CY2023Q1	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	0	usd
CY2024Q1	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	0	usd
CY2023Q1	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	57000	usd
CY2024Q1	wtfc	Issuance Of Common Shares Resulting From Exercise Of Share Based Compensation Awards IssuanceOfCommonSharesResultingFromExerciseOfShareBasedCompensationAwards	2098000	usd
CY2023Q1	wtfc	Issuance Of Common Shares Resulting From Exercise Of Share Based Compensation Awards IssuanceOfCommonSharesResultingFromExerciseOfShareBasedCompensationAwards	3579000	usd
CY2024Q1	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	3540000	usd
CY2023Q1	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1662000	usd
CY2024Q1	us-gaap	Payments Of Dividends PaymentsOfDividends	34218000	usd
CY2023Q1	us-gaap	Payments Of Dividends PaymentsOfDividends	31398000	usd
CY2024Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1304467000	usd
CY2023Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-227841000	usd
CY2024Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-43578000	usd
CY2023Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-44980000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	423464000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	490966000	usd
CY2024Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	379886000	usd
CY2023Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	445986000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	4942360000	usd
CY2024Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	2001000	usd
CY2024Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	556763000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	4387598000	usd
CY2024Q1	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	3810344000	usd
CY2024Q1	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	697000	usd
CY2024Q1	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	699087000	usd
CY2024Q1	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	3111954000	usd
CY2024Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	329000	usd
CY2024Q1	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	3810015000	usd
CY2024Q1	us-gaap	Equity Securities Fv Ni Cost EquitySecuritiesFvNiCost	123421000	usd
CY2024Q1	wtfc	Equity Securities Fvni Accumulated Unrealized Gain EquitySecuritiesFVNIAccumulatedUnrealizedGain	4480000	usd
CY2024Q1	wtfc	Equity Securities Fvni Accumulated Unrealized Loss EquitySecuritiesFVNIAccumulatedUnrealizedLoss	8124000	usd
CY2024Q1	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	119777000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	3979814000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	3525000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	480424000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	3502915000	usd
CY2023Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	3857263000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	3472000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	645267000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	3215468000	usd
CY2023Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	347000	usd
CY2023Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	3856916000	usd
CY2023Q4	us-gaap	Equity Securities Fv Ni Cost EquitySecuritiesFvNiCost	143312000	usd
CY2023Q4	wtfc	Equity Securities Fvni Accumulated Unrealized Gain EquitySecuritiesFVNIAccumulatedUnrealizedGain	3500000	usd
CY2023Q4	wtfc	Equity Securities Fvni Accumulated Unrealized Loss EquitySecuritiesFVNIAccumulatedUnrealizedLoss	7544000	usd
CY2023Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	139268000	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	3739980000	usd
CY2023Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	2227000	usd
CY2023Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	482362000	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	3259845000	usd
CY2023Q1	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	3606854000	usd
CY2023Q1	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	2352000	usd
CY2023Q1	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	633008000	usd
CY2023Q1	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	2976198000	usd
CY2023Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	463000	usd
CY2023Q1	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	3606391000	usd
CY2023Q1	us-gaap	Equity Securities Fv Ni Cost EquitySecuritiesFvNiCost	116296000	usd
CY2023Q1	wtfc	Equity Securities Fvni Accumulated Unrealized Gain EquitySecuritiesFVNIAccumulatedUnrealizedGain	3065000	usd
CY2023Q1	wtfc	Equity Securities Fvni Accumulated Unrealized Loss EquitySecuritiesFVNIAccumulatedUnrealizedLoss	7418000	usd
CY2023Q1	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	111943000	usd
CY2024Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	63200000	usd
CY2023Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount	0	usd
CY2023Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	0	usd
CY2024Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount	0	usd
CY2024Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	0	usd
CY2024Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	-2000	usd
CY2023Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	0	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	1707236000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	16975000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	2540588000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	539788000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	4247824000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	556763000	usd
CY2024Q1	wtfc	Marketable Securities Gross Realized Gains Excluding Other Than Temporary Impairments MarketableSecuritiesGrossRealizedGainsExcludingOtherThanTemporaryImpairments	1035000	usd
CY2023Q1	wtfc	Marketable Securities Gross Realized Gains Excluding Other Than Temporary Impairments MarketableSecuritiesGrossRealizedGainsExcludingOtherThanTemporaryImpairments	605000	usd
CY2024Q1	wtfc	Marketable Securities Gross Realized Losses Excluding Other Than Temporary Impairments MarketableSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments	108000	usd
CY2023Q1	wtfc	Marketable Securities Gross Realized Losses Excluding Other Than Temporary Impairments MarketableSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments	45000	usd
CY2024Q1	us-gaap	Marketable Securities Realized Gain Loss Excluding Other Than Temporary Impairments MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments	927000	usd
CY2023Q1	us-gaap	Marketable Securities Realized Gain Loss Excluding Other Than Temporary Impairments MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments	560000	usd
CY2024Q1	us-gaap	Equity Securities Fv Ni Unrealized Gain EquitySecuritiesFvNiUnrealizedGain	1034000	usd
CY2023Q1	us-gaap	Equity Securities Fv Ni Unrealized Gain EquitySecuritiesFvNiUnrealizedGain	2290000	usd
CY2024Q1	us-gaap	Equity Securities Fv Ni Unrealized Loss EquitySecuritiesFvNiUnrealizedLoss	633000	usd
CY2023Q1	us-gaap	Equity Securities Fv Ni Unrealized Loss EquitySecuritiesFvNiUnrealizedLoss	1452000	usd
CY2024Q1	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	401000	usd
CY2023Q1	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	838000	usd
CY2024Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	-2000	usd
CY2023Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	0	usd
CY2024Q1	wtfc	Marketable Securities Gain Loss Including Other Than Temporary Impairment Loss MarketableSecuritiesGainLossIncludingOtherThanTemporaryImpairmentLoss	1326000	usd
CY2023Q1	wtfc	Marketable Securities Gain Loss Including Other Than Temporary Impairment Loss MarketableSecuritiesGainLossIncludingOtherThanTemporaryImpairmentLoss	1398000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis	107680000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Fair Value AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	107285000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis	53162000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Fair Value AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	52945000	usd
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis	108880000	usd
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Fair Value AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	108429000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis	130137000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	121417000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis	132348000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	123985000	usd
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis	131959000	usd
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	122172000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis	85212000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue	80234000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis	82040000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue	76869000	usd
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis	39019000	usd
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue	35158000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis	17904000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue	15269000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis	18705000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue	15782000	usd
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis	64194000	usd
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue	58112000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	4942360000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	4387598000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	3979814000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	3502915000	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	3739980000	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	3259845000	usd
CY2024Q1	us-gaap	Heldtomaturity Securities Debt Maturities Next Rolling Twelve Months Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCost	4652000	usd
CY2024Q1	us-gaap	Held To Maturity Securities Debt Maturities Next Rolling Twelve Months Fair Value HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	4616000	usd
CY2023Q4	us-gaap	Heldtomaturity Securities Debt Maturities Next Rolling Twelve Months Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCost	5169000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities Next Rolling Twelve Months Fair Value HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	5142000	usd
CY2023Q1	us-gaap	Heldtomaturity Securities Debt Maturities Next Rolling Twelve Months Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCost	2302000	usd
CY2023Q1	us-gaap	Held To Maturity Securities Debt Maturities Next Rolling Twelve Months Fair Value HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	2300000	usd
CY2024Q1	us-gaap	Heldtomaturity Securities Debt Maturities Rolling Year Two Through Five Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCost	115707000	usd
CY2024Q1	us-gaap	Held To Maturity Securities Debt Maturities Rolling Year Two Through Five Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	111324000	usd
CY2023Q4	us-gaap	Heldtomaturity Securities Debt Maturities Rolling Year Two Through Five Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCost	109602000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities Rolling Year Two Through Five Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	105835000	usd
CY2023Q1	us-gaap	Heldtomaturity Securities Debt Maturities Rolling Year Two Through Five Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCost	98207000	usd
CY2023Q1	us-gaap	Held To Maturity Securities Debt Maturities Rolling Year Two Through Five Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	93717000	usd
CY2024Q1	us-gaap	Heldtomaturity Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCost	89538000	usd
CY2024Q1	us-gaap	Held To Maturity Securities Debt Maturities Rolling Year Six Through Ten Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue	88050000	usd
CY2023Q4	us-gaap	Heldtomaturity Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCost	99700000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities Rolling Year Six Through Ten Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue	98718000	usd
CY2023Q1	us-gaap	Heldtomaturity Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCost	110967000	usd
CY2023Q1	us-gaap	Held To Maturity Securities Debt Maturities Rolling Year Six Through Ten Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue	110892000	usd
CY2024Q1	us-gaap	Heldtomaturity Securities Debt Maturities Rolling After Ten Years Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingAfterTenYearsAmortizedCost	352428000	usd
CY2024Q1	us-gaap	Held To Maturity Securities Debt Maturities Rolling After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue	280536000	usd
CY2023Q4	us-gaap	Heldtomaturity Securities Debt Maturities Rolling After Ten Years Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingAfterTenYearsAmortizedCost	352474000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities Rolling After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue	283506000	usd
CY2023Q1	us-gaap	Heldtomaturity Securities Debt Maturities Rolling After Ten Years Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingAfterTenYearsAmortizedCost	360913000	usd
CY2023Q1	us-gaap	Held To Maturity Securities Debt Maturities Rolling After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue	289473000	usd
CY2024Q1	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	3810344000	usd
CY2023Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	3857263000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	3215468000	usd
CY2023Q1	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	3606854000	usd
CY2023Q1	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	2976198000	usd
CY2024Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	329000	usd
CY2023Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	347000	usd
CY2023Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	463000	usd
CY2024Q1	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	3810015000	usd
CY2023Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	3856916000	usd
CY2023Q1	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	3606391000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Restricted DebtSecuritiesAvailableForSaleRestricted	7200000000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Restricted DebtSecuritiesAvailableForSaleRestricted	6900000000	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Restricted DebtSecuritiesAvailableForSaleRestricted	5700000000	usd
CY2024Q1	wtfc	Securities By A Single Non Government Sponsored Issuer Exceeding Ten Percent Of Shareholders Equity SecuritiesByASingleNonGovernmentSponsoredIssuerExceedingTenPercentOfShareholdersEquity	0	security
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	43230706000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	42131831000	usd
CY2023Q1	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	39565471000	usd
CY2024Q1	wtfc	Percentage Of Loans And Leases Receivable Gross Carrying Amount PercentageOfLoansAndLeasesReceivableGrossCarryingAmount	1
CY2023Q4	wtfc	Percentage Of Loans And Leases Receivable Gross Carrying Amount PercentageOfLoansAndLeasesReceivableGrossCarryingAmount	1
CY2023Q1	wtfc	Percentage Of Loans And Leases Receivable Gross Carrying Amount PercentageOfLoansAndLeasesReceivableGrossCarryingAmount	1
CY2024Q1	us-gaap	Financing Receivable Unamortized Loan Commitment Origination Fee And Premium Discount FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount	84900000	usd
CY2023Q4	us-gaap	Financing Receivable Unamortized Loan Commitment Origination Fee And Premium Discount FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount	84200000	usd
CY2023Q1	us-gaap	Financing Receivable Unamortized Loan Commitment Origination Fee And Premium Discount FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount	70900000	usd
CY2024Q1	us-gaap	Financial Asset Amortized Cost Accrued Interest After Allowance For Credit Loss FinancialAssetAmortizedCostAccruedInterestAfterAllowanceForCreditLoss	307800000	usd
CY2023Q4	us-gaap	Financial Asset Amortized Cost Accrued Interest After Allowance For Credit Loss FinancialAssetAmortizedCostAccruedInterestAfterAllowanceForCreditLoss	304500000	usd
CY2023Q1	us-gaap	Financial Asset Amortized Cost Accrued Interest After Allowance For Credit Loss FinancialAssetAmortizedCostAccruedInterestAfterAllowanceForCreditLoss	245100000	usd
CY2024Q1	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	122408000	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	43230706000	usd
CY2023Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	118743000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	42131831000	usd
CY2023Q1	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	119463000	usd
CY2023Q1	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	39565471000	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Year One Originated Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear	5931662000	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Year Two Originated Fiscal Year Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear	15453196000	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Year Three Originated Two Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear	5753969000	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Year Four Originated Three Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear	4190014000	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Year Five Originated Four Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear	1949275000	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Originated More Than Five Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear	5123622000	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Revolving FinancingReceivableExcludingAccruedInterestRevolving	4814356000	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Revolving Converted To Term Loan FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan	14612000	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	43230706000	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Year One Originated Current Fiscal Year Writeoff FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff	99000	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff	13085000	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Year Three Originated Two Years Before Current Fiscal Year Writeoff FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff	2129000	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Year Four Originated Three Years Before Current Fiscal Year Writeoff FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff	660000	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Year Five Originated Four Years Before Current Fiscal Year Writeoff FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff	1965000	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Originated More Than Five Years Before Current Fiscal Year Writeoff FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff	5903000	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Revolving Writeoff FinancingReceivableExcludingAccruedInterestRevolvingWriteoff	0	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Revolving Converted To Term Loan Writeoff FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoanWriteoff	0	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	23841000	usd
CY2024Q1	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	3810344000	usd
CY2024Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	329000	usd
CY2024Q1	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	3810015000	usd
CY2024Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	329000	usd
CY2023Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	347000	usd
CY2023Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	463000	usd
CY2024Q1	wtfc	Allowance For Credit Loss Excluding Accrued Interest AllowanceForCreditLossExcludingAccruedInterest	427504000	usd
CY2023Q4	wtfc	Allowance For Credit Loss Excluding Accrued Interest AllowanceForCreditLossExcludingAccruedInterest	427612000	usd
CY2023Q1	wtfc	Allowance For Credit Loss Excluding Accrued Interest AllowanceForCreditLossExcludingAccruedInterest	376261000	usd
CY2024Q1	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	52800000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	427265000	usd
CY2024Q1	wtfc	Financing Receivable Allowance For Credit Losses Other Adjustments Expense Benefit FinancingReceivableAllowanceForCreditLossesOtherAdjustmentsExpenseBenefit	31000	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	23841000	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	2091000	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	21691000	usd
CY2024Q1	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	427175000	usd
CY2024Q1	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	15841000	usd
CY2024Q1	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	411334000	usd
CY2024Q1	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	89368000	usd
CY2024Q1	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	42996973000	usd
CY2024Q1	wtfc	Loans Held For Investment Fair Value Disclosure LoansHeldForInvestmentFairValueDisclosure	144365000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	357448000	usd
CY2023Q1	wtfc	Financing Receivable Allowance For Credit Losses Other Adjustments Expense Benefit FinancingReceivableAllowanceForCreditLossesOtherAdjustmentsExpenseBenefit	-4000	usd
CY2023Q1	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	7351000	usd
CY2023Q1	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	1886000	usd
CY2023Q1	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	23070000	usd
CY2023Q1	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	375798000	usd
CY2023Q1	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	12903000	usd
CY2023Q1	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	362895000	usd
CY2023Q1	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	71622000	usd
CY2023Q1	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	39286317000	usd
CY2023Q1	wtfc	Loans Held For Investment Fair Value Disclosure LoansHeldForInvestmentFairValueDisclosure	207532000	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	21700000	usd
CY2023Q1	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	23100000	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff After Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecovery	21800000	usd
CY2023Q1	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff After Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecovery	5500000	usd
CY2024Q1	us-gaap	Debt Securities Held To Maturity Credit Loss Expense Reversal DebtSecuritiesHeldToMaturityCreditLossExpenseReversal	18000	usd
CY2023Q1	us-gaap	Debt Securities Held To Maturity Credit Loss Expense Reversal DebtSecuritiesHeldToMaturityCreditLossExpenseReversal	25000	usd
CY2024Q1	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	1146000	usd
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Modified Period FinancingReceivableExcludingAccruedInterestModifiedPeriod	3122000	usd
CY2024Q1	us-gaap	Financing Receivable Modification To Total Financing Receivables Excluding Accrued Interest Percent FinancingReceivableModificationToTotalFinancingReceivablesExcludingAccruedInterestPercent	0.000
CY2024Q1	us-gaap	Financing Receivable Excluding Accrued Interest Modified Period FinancingReceivableExcludingAccruedInterestModifiedPeriod	3122000	usd
CY2023Q1	us-gaap	Financing Receivable Excluding Accrued Interest Modified Period FinancingReceivableExcludingAccruedInterestModifiedPeriod	40729000	usd
CY2023Q1	us-gaap	Financing Receivable Modification To Total Financing Receivables Excluding Accrued Interest Percent FinancingReceivableModificationToTotalFinancingReceivablesExcludingAccruedInterestPercent	0.001
CY2023Q1	us-gaap	Financing Receivable Excluding Accrued Interest Modified Period FinancingReceivableExcludingAccruedInterestModifiedPeriod	40729000	usd
CY2024Q1	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	4200000	usd
CY2023Q1	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	32200000	usd
CY2024	us-gaap	Financing Receivable Excluding Accrued Interest Modified Period FinancingReceivableExcludingAccruedInterestModifiedPeriod	25976000	usd
CY2023Q1	us-gaap	Financing Receivable Excluding Accrued Interest Modified Period FinancingReceivableExcludingAccruedInterestModifiedPeriod	40729000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	656672000	usd
CY2024Q1	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	usd
CY2024Q1	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2024Q1	us-gaap	Goodwill Translation And Purchase Accounting Adjustments GoodwillTranslationAndPurchaseAccountingAdjustments	-491000	usd
CY2024Q1	us-gaap	Goodwill Goodwill	656181000	usd
CY2024Q1	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	89598000	usd
CY2023Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	89599000	usd
CY2023Q1	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	83398000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	67868000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	66710000	usd
CY2023Q1	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	62447000	usd
CY2024Q1	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	21730000	usd
CY2023Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	22889000	usd
CY2023Q1	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	20951000	usd
CY2024Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1158000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	3143000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	3482000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	2772000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	2156000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	1591000	usd
CY2024Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1200000	usd
CY2023Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1200000	usd
CY2023Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	192456000	usd
CY2022Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	230225000	usd
CY2024Q1	wtfc	Servicing Assets At Fair Value Additions From Loans Sold With Servicing Retained ServicingAssetsAtFairValueAdditionsFromLoansSoldWithServicingRetained	5379000	usd
CY2023Q1	wtfc	Servicing Assets At Fair Value Additions From Loans Sold With Servicing Retained ServicingAssetsAtFairValueAdditionsFromLoansSoldWithServicingRetained	5107000	usd
CY2024Q1	us-gaap	Servicing Asset At Fair Value Other Changes In Fair Value ServicingAssetAtFairValueOtherChangesInFairValue	-4386000	usd
CY2023Q1	us-gaap	Servicing Asset At Fair Value Other Changes In Fair Value ServicingAssetAtFairValueOtherChangesInFairValue	-3909000	usd
CY2024Q1	us-gaap	Servicing Asset At Fair Value Changes In Fair Value Resulting From Changes In Valuation Inputs Or Changes In Assumptions ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions	7595000	usd
CY2023Q1	us-gaap	Servicing Asset At Fair Value Changes In Fair Value Resulting From Changes In Valuation Inputs Or Changes In Assumptions ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions	-6953000	usd
CY2024Q1	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	201044000	usd
CY2023Q1	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	224470000	usd
CY2024Q1	us-gaap	Principal Amount Outstanding On Loans Managed And Securitized PrincipalAmountOutstandingOnLoansManagedAndSecuritized	12051392000	usd
CY2023Q1	us-gaap	Principal Amount Outstanding On Loans Managed And Securitized PrincipalAmountOutstandingOnLoansManagedAndSecuritized	14080461000	usd
CY2024Q1	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	9908183000	usd
CY2023Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	10420401000	usd
CY2023Q1	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	11236083000	usd
CY2024Q1	us-gaap	Deposits Negotiable Order Of Withdrawal Now DepositsNegotiableOrderOfWithdrawalNOW	5720947000	usd
CY2023Q4	us-gaap	Deposits Negotiable Order Of Withdrawal Now DepositsNegotiableOrderOfWithdrawalNOW	5797649000	usd
CY2023Q1	us-gaap	Deposits Negotiable Order Of Withdrawal Now DepositsNegotiableOrderOfWithdrawalNOW	5576558000	usd
CY2024Q1	wtfc	Wealth Management Deposits WealthManagementDeposits	1347817000	usd
CY2023Q4	wtfc	Wealth Management Deposits WealthManagementDeposits	1614499000	usd
CY2023Q1	wtfc	Wealth Management Deposits WealthManagementDeposits	1809933000	usd
CY2024Q1	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	15617717000	usd
CY2023Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	15149215000	usd
CY2023Q1	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	13552277000	usd
CY2024Q1	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	5959774000	usd
CY2023Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	5790334000	usd
CY2023Q1	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	5192108000	usd
CY2024Q1	us-gaap	Time Deposits TimeDeposits	7894420000	usd
CY2023Q4	us-gaap	Time Deposits TimeDeposits	6625072000	usd
CY2023Q1	us-gaap	Time Deposits TimeDeposits	5351252000	usd
CY2024Q1	us-gaap	Deposits Deposits	46448858000	usd
CY2023Q4	us-gaap	Deposits Deposits	45397170000	usd
CY2023Q1	us-gaap	Deposits Deposits	42718211000	usd
CY2024Q1	wtfc	Non Interest Bearing Deposits Percentage NonInterestBearingDepositsPercentage	0.21
CY2023Q4	wtfc	Non Interest Bearing Deposits Percentage NonInterestBearingDepositsPercentage	0.23
CY2023Q1	wtfc	Non Interest Bearing Deposits Percentage NonInterestBearingDepositsPercentage	0.26
CY2024Q1	wtfc	Negotiable Order Of Withdrawal And Interest Bearing Demand Deposits Percentage NegotiableOrderOfWithdrawalAndInterestBearingDemandDepositsPercentage	0.12
CY2023Q4	wtfc	Negotiable Order Of Withdrawal And Interest Bearing Demand Deposits Percentage NegotiableOrderOfWithdrawalAndInterestBearingDemandDepositsPercentage	0.13
CY2023Q1	wtfc	Negotiable Order Of Withdrawal And Interest Bearing Demand Deposits Percentage NegotiableOrderOfWithdrawalAndInterestBearingDemandDepositsPercentage	0.13
CY2024Q1	wtfc	Wealth Management Deposits Percentage WealthManagementDepositsPercentage	0.03
CY2023Q4	wtfc	Wealth Management Deposits Percentage WealthManagementDepositsPercentage	0.04
CY2023Q1	wtfc	Wealth Management Deposits Percentage WealthManagementDepositsPercentage	0.04
CY2024Q1	us-gaap	Percentage Of Interest Bearing Domestic Deposits To Deposits Money Market PercentageOfInterestBearingDomesticDepositsToDepositsMoneyMarket	0.34
CY2023Q4	us-gaap	Percentage Of Interest Bearing Domestic Deposits To Deposits Money Market PercentageOfInterestBearingDomesticDepositsToDepositsMoneyMarket	0.33
CY2023Q1	us-gaap	Percentage Of Interest Bearing Domestic Deposits To Deposits Money Market PercentageOfInterestBearingDomesticDepositsToDepositsMoneyMarket	0.32
CY2024Q1	us-gaap	Percentage Of Interest Bearing Domestic Deposits To Deposits Savings PercentageOfInterestBearingDomesticDepositsToDepositsSavings	0.13
CY2023Q4	us-gaap	Percentage Of Interest Bearing Domestic Deposits To Deposits Savings PercentageOfInterestBearingDomesticDepositsToDepositsSavings	0.13
CY2023Q1	us-gaap	Percentage Of Interest Bearing Domestic Deposits To Deposits Savings PercentageOfInterestBearingDomesticDepositsToDepositsSavings	0.12
CY2024Q1	us-gaap	Percentage Of Interest Bearing Domestic Deposits To Deposits Time Deposits PercentageOfInterestBearingDomesticDepositsToDepositsTimeDeposits	0.17
CY2023Q4	us-gaap	Percentage Of Interest Bearing Domestic Deposits To Deposits Time Deposits PercentageOfInterestBearingDomesticDepositsToDepositsTimeDeposits	0.14
CY2023Q1	us-gaap	Percentage Of Interest Bearing Domestic Deposits To Deposits Time Deposits PercentageOfInterestBearingDomesticDepositsToDepositsTimeDeposits	0.13
CY2024Q1	wtfc	Deposits Percentage DepositsPercentage	1
CY2023Q4	wtfc	Deposits Percentage DepositsPercentage	1
CY2023Q1	wtfc	Deposits Percentage DepositsPercentage	1
CY2024Q1	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	2676751000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	2326071000	usd
CY2023Q1	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	2316071000	usd
CY2024Q1	us-gaap	Notes Payable NotesPayable	164153000	usd
CY2023Q4	us-gaap	Notes Payable NotesPayable	171282000	usd
CY2023Q1	us-gaap	Notes Payable NotesPayable	192666000	usd
CY2024Q1	us-gaap	Short Term Borrowings ShortTermBorrowings	10869000	usd
CY2023Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	13430000	usd
CY2023Q1	us-gaap	Short Term Borrowings ShortTermBorrowings	10124000	usd
CY2024Q1	us-gaap	Secured Debt SecuredDebt	341704000	usd
CY2023Q4	us-gaap	Secured Debt SecuredDebt	401897000	usd
CY2023Q1	us-gaap	Secured Debt SecuredDebt	320007000	usd
CY2024Q1	us-gaap	Other Long Term Debt OtherLongTermDebt	58682000	usd
CY2023Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	59204000	usd
CY2023Q1	us-gaap	Other Long Term Debt OtherLongTermDebt	60751000	usd
CY2024Q1	us-gaap	Other Borrowings OtherBorrowings	575408000	usd
CY2023Q4	us-gaap	Other Borrowings OtherBorrowings	645813000	usd
CY2023Q1	us-gaap	Other Borrowings OtherBorrowings	583548000	usd
CY2024Q1	us-gaap	Subordinated Debt SubordinatedDebt	437965000	usd
CY2023Q4	us-gaap	Subordinated Debt SubordinatedDebt	437866000	usd
CY2023Q1	us-gaap	Subordinated Debt SubordinatedDebt	437493000	usd
CY2024Q1	wtfc	Debt Current And Noncurrent DebtCurrentAndNoncurrent	3690124000	usd
CY2023Q4	wtfc	Debt Current And Noncurrent DebtCurrentAndNoncurrent	3409750000	usd
CY2023Q1	wtfc	Debt Current And Noncurrent DebtCurrentAndNoncurrent	3337112000	usd
CY2024Q1	us-gaap	Subordinated Debt SubordinatedDebt	438000000	usd
CY2023Q4	us-gaap	Subordinated Debt SubordinatedDebt	437900000	usd
CY2023Q1	us-gaap	Subordinated Debt SubordinatedDebt	437500000	usd
CY2024Q1	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2024Q1	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2024Q1	wtfc	Number Of Subsidiaries NumberOfSubsidiaries	15	subsidiary
CY2024Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	464194000	usd
CY2023Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	457995000	usd
CY2024Q1	wtfc	Change In Contribution Interest Income Expense Net ChangeInContributionInterestIncomeExpenseNet	6199000	usd
CY2024Q1	wtfc	Interest Income Expense Net Percentage InterestIncomeExpenseNetPercentage	0.01
CY2024Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	21673000	usd
CY2023Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	23045000	usd
CY2024Q1	wtfc	Change In Contribution Provision For Loan Lease And Other Losses ChangeInContributionProvisionForLoanLeaseAndOtherLosses	-1372000	usd
CY2024Q1	wtfc	Change In Contribution Provision For Loan Lease And Other Losses Percentage ChangeInContributionProvisionForLoanLeaseAndOtherLossesPercentage	-0.06
CY2024Q1	us-gaap	Noninterest Income NoninterestIncome	140580000	usd
CY2023Q1	us-gaap	Noninterest Income NoninterestIncome	107769000	usd
CY2024Q1	wtfc	Change In Contribution Non Interest Income ChangeInContributionNonInterestIncome	32811000	usd
CY2024Q1	wtfc	Non Interest Income Percentage NonInterestIncomePercentage	0.30
CY2024Q1	us-gaap	Revenues Revenues	604774000	usd
CY2023Q1	us-gaap	Revenues Revenues	565764000	usd
CY2024Q1	wtfc	Change In Contribution Revenues ChangeInContributionRevenues	39010000	usd
CY2024Q1	wtfc	Revenues Percentage RevenuesPercentage	0.07
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	187294000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	180198000	usd
CY2024Q1	wtfc	Change In Contribution Operating Income Loss ChangeInContributionOperatingIncomeLoss	7096000	usd
CY2024Q1	wtfc	Operating Income Loss Percentage OperatingIncomeLossPercentage	0.04
CY2024Q1	us-gaap	Assets Assets	57576933000	usd
CY2023Q1	us-gaap	Assets Assets	52873511000	usd
CY2024Q1	wtfc	Change In Contribution Assets ChangeInContributionAssets	4703422000	usd
CY2024Q1	wtfc	Assets Percentage AssetsPercentage	0.09
CY2024Q1	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	259264000	usd
CY2023Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	275726000	usd
CY2023Q1	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	274004000	usd
CY2024Q1	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	324364000	usd
CY2023Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	267255000	usd
CY2023Q1	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	274432000	usd
CY2024Q1	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	-56900000	usd
CY2024Q1	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	0	usd
CY2024Q1	wtfc	Impaired Loans Fair Value Losses Recognized ImpairedLoansFairValueLossesRecognized	16726000	usd
CY2024Q1	wtfc	Real Estate Acquired Through Foreclosure Fair Value Losses Recognized RealEstateAcquiredThroughForeclosureFairValueLossesRecognized	207000	usd
CY2024Q1	wtfc	Assets Nonrecurring Fair Value Losses Recognized AssetsNonrecurringFairValueLossesRecognized	16933000	usd
CY2024Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	737000	shares
CY2024Q1	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	9200000	usd
CY2023Q1	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	8300000	usd
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	13100	shares
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	42.76
CY2024Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
CY2024Q1	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0
CY2024Q1	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	775	shares
CY2024Q1	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	32.26
CY2024Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	0	shares
CY2024Q1	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	0
CY2024Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	12325	shares
CY2024Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	43.42
CY2024Q1	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P4Y2M12D
CY2024Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	751000	usd
CY2024Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	12325	shares
CY2024Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	43.42
CY2024Q1	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P4Y2M12D
CY2024Q1	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	751000	usd
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	68093	shares
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	41.14
CY2023Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
CY2023Q1	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0
CY2023Q1	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	54218	shares
CY2023Q1	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	40.87
CY2023Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	0	shares
CY2023Q1	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	0
CY2023Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	13875	shares
CY2023Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	42.18
CY2023Q1	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P4Y8M12D
CY2023Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	427000	usd
CY2023Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	13875	shares
CY2023Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	42.18
CY2023Q1	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P4Y8M12D
CY2023Q1	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	427000	usd
CY2024Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	50000	usd
CY2023Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	2500000	usd
CY2024Q1	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	25000	usd
CY2023Q1	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	2200000	usd
CY2024Q1	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	-138475000	usd
CY2024Q1	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-14595000	usd
CY2024Q1	wtfc	Reclassification From Aoci Amortization Of Unrealized Gains Losses On Investment Securities Transferred To Held To Maturity From Available For Sale Net Of Tax Attributable To Parent ReclassificationFromAOCIAmortizationOfUnrealizedGainsLossesOnInvestmentSecuritiesTransferredToHeldToMaturityFromAvailableForSaleNetOfTaxAttributableToParent	37000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-123917000	usd
CY2023Q1	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	57892000	usd
CY2023Q1	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-2340000	usd
CY2023Q1	wtfc	Reclassification From Aoci Amortization Of Unrealized Gains Losses On Investment Securities Transferred To Held To Maturity From Available For Sale Net Of Tax Attributable To Parent ReclassificationFromAOCIAmortizationOfUnrealizedGainsLossesOnInvestmentSecuritiesTransferredToHeldToMaturityFromAvailableForSaleNetOfTaxAttributableToParent	32000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	60200000	usd
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	187294000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	180198000	usd
CY2024Q1	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	6991000	usd
CY2023Q1	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	6991000	usd
CY2024Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	180303000	usd
CY2023Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	173207000	usd
CY2024Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	61481000	shares
CY2023Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	60950000	shares
CY2024Q1	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	928000	shares
CY2023Q1	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	873000	shares
CY2024Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	62409000	shares
CY2023Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	61823000	shares
CY2024Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.93
CY2023Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.84
CY2024Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.89
CY2023Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.80
CY2024Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.45
CY2024Q1	ecd	Rule10b51 Arr Adopted Flag Rule10b51ArrAdoptedFlag	false
CY2024Q1	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false
CY2024Q1	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2024Q1	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false

Files In Submission

Name	View Source	Status
0001015328-24-000143-index-headers.html	Edgar Link	pending
0001015328-24-000143-index.html	Edgar Link	pending
0001015328-24-000143.txt	Edgar Link	pending
0001015328-24-000143-xbrl.zip	Edgar Link	pending
exhibit101employmentagreem.htm	Edgar Link	pending
exhibit3112024q1.htm	Edgar Link	pending
exhibit3122024q1.htm	Edgar Link	pending
exhibit3212024q1.htm	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
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FilingSummary.xml	Edgar Link	unprocessable
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending
wtfc-20240331.htm	Edgar Link	pending
wtfc-20240331.xsd	Edgar Link	pending
wtfc-20240331_cal.xml	Edgar Link	unprocessable
wtfc-20240331_def.xml	Edgar Link	unprocessable
wtfc-20240331_lab.xml	Edgar Link	unprocessable
wtfc-20240331_pre.xml	Edgar Link	unprocessable
wtfc-20240331_htm.xml	Edgar Link	completed

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$WTFC
WINTRUST FINANCIAL CORP Stock $wtfc

2024 Q2 Form 10-Q Financial Statement

#000101532824000143 Filed on May 09, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WTFC WINTRUST FINANCIAL CORP Stock $wtfc

2024 Q2 Form 10-Q Financial Statement

#000101532824000143 Filed on May 09, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WTFC
WINTRUST FINANCIAL CORP Stock $wtfc