XML 61 R52.htm IDEA: XBRL DOCUMENT
v3.23.3

Allowance for Credit Losses - Schedule of Aging of the Company's Loan Portfolio (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual | $ 104,967 | $ 98,379 | $ 102,930
Loans, net of unearned income | 41,446,032 | 39,196,485 | 38,167,613
Early buy-out loans guaranteed by U.S. government agencies |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual | 117 | 31,279 | 24,020
Loans, net of unearned income | 168,973 | 164,788 | 148,664
Commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual | 43,569 | 35,579 | 44,293
Loans, net of unearned income | 12,725,473 | 12,549,164 | 12,259,250
Commercial real estate |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 10,946,180 | 9,950,947 | 9,578,184
Commercial real estate | Construction and development |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual | 8,384 | 416 | 889
Loans, net of unearned income | 1,893,773 | 1,486,930 | 1,525,511
Commercial real estate | Construction and development |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual | 8,659 | 5,971 | 9,588
Loans, net of unearned income | 9,052,407 | 8,464,017 | 8,052,673
Home equity |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual | 1,363 | 1,487 | 1,320
Loans, net of unearned income | 343,258 | 332,698 | 328,822
Residential real estate |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 2,707,603 | 2,372,383 | 2,235,459
Residential real estate | Residential real estate, excluding early buy-out loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual | 16,103 | 10,171 | 9,787
Loans, net of unearned income | 2,538,630 | 2,207,595 | 2,086,795
Premium finance receivables | Property and casualty insurance loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual | 26,756 | 13,470 | 13,026
Loans, net of unearned income | 6,722,747 | 5,849,459 | 5,713,340
Premium finance receivables | Life insurance loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual | 0 | 0 | 0
Loans, net of unearned income | 7,931,808 | 8,090,998 | 8,004,856
Consumer and other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual | 16 | 6 | 7
Loans, net of unearned income | 68,963 | 50,836 | 47,702
Total loans, net of unearned income, excluding early buy-out loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual | 104,850 | 67,100 | 78,910
Loans, net of unearned income | 41,277,059 | 39,031,697 | 38,018,949
90+ days and still accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 85,809 | 81,047 | 86,790
90+ days and still accruing | Early buy-out loans guaranteed by U.S. government agencies |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 57,558 | 47,450 | 68,067
90+ days and still accruing | Commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 200 | 462 | 237
90+ days and still accruing | Commercial real estate | Construction and development |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 0 | 0 | 0
90+ days and still accruing | Commercial real estate | Construction and development |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 1,092 | 0 | 0
90+ days and still accruing | Home equity |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 0 | 0 | 0
90+ days and still accruing | Residential real estate | Residential real estate, excluding early buy-out loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 0 | 0 | 0
90+ days and still accruing | Premium finance receivables | Property and casualty insurance loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 16,253 | 15,841 | 16,624
90+ days and still accruing | Premium finance receivables | Life insurance loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 10,679 | 17,245 | 1,831
90+ days and still accruing | Consumer and other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 27 | 49 | 31
90+ days and still accruing | Total loans, net of unearned income, excluding early buy-out loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 28,251 | 33,597 | 18,723
60-89 days past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 92,406 | 48,924 | 62,400
60-89 days past due | Early buy-out loans guaranteed by U.S. government agencies |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 2,116 | 984 | 489
60-89 days past due | Commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 22,889 | 21,128 | 24,641
60-89 days past due | Commercial real estate | Construction and development |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 2,438 | 361 | 0
60-89 days past due | Commercial real estate | Construction and development |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 4,957 | 1,883 | 6,041
60-89 days past due | Home equity |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 219 | 0 | 125
60-89 days past due | Residential real estate | Residential real estate, excluding early buy-out loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 1,145 | 4,364 | 2,149
60-89 days past due | Premium finance receivables | Property and casualty insurance loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 16,552 | 14,926 | 15,301
60-89 days past due | Premium finance receivables | Life insurance loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 41,894 | 5,260 | 13,628
60-89 days past due | Consumer and other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 196 | 18 | 26
60-89 days past due | Total loans, net of unearned income, excluding early buy-out loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 90,290 | 47,940 | 61,911
30-59 days past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 146,647 | 210,595 | 132,280
30-59 days past due | Early buy-out loans guaranteed by U.S. government agencies |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 0 | 1,584 | 104
30-59 days past due | Commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 35,681 | 56,696 | 34,917
30-59 days past due | Commercial real estate | Construction and development |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 31,292 | 14,390 | 5,715
30-59 days past due | Commercial real estate | Construction and development |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 29,692 | 16,285 | 24,256
30-59 days past due | Home equity |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 1,668 | 2,152 | 848
30-59 days past due | Residential real estate | Residential real estate, excluding early buy-out loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 904 | 9,982 | 15
30-59 days past due | Premium finance receivables | Property and casualty insurance loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 31,919 | 40,557 | 21,128
30-59 days past due | Premium finance receivables | Life insurance loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 14,972 | 68,725 | 44,954
30-59 days past due | Consumer and other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 519 | 224 | 343
30-59 days past due | Total loans, net of unearned income, excluding early buy-out loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 146,647 | 209,011 | 132,176
Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 41,016,203 | 38,757,540 | 37,783,213
Current | Early buy-out loans guaranteed by U.S. government agencies |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 109,182 | 83,491 | 55,984
Current | Commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 12,623,134 | 12,435,299 | 12,155,162
Current | Commercial real estate | Construction and development |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 1,851,659 | 1,471,763 | 1,518,907
Current | Commercial real estate | Construction and development |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 9,008,007 | 8,439,878 | 8,012,788
Current | Home equity |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 340,008 | 329,059 | 326,529
Current | Residential real estate | Residential real estate, excluding early buy-out loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 2,520,478 | 2,183,078 | 2,074,844
Current | Premium finance receivables | Property and casualty insurance loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 6,631,267 | 5,764,665 | 5,647,261
Current | Premium finance receivables | Life insurance loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 7,864,263 | 7,999,768 | 7,944,443
Current | Consumer and other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | 68,205 | 50,539 | 47,295
Current | Total loans, net of unearned income, excluding early buy-out loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans, net of unearned income | $ 40,907,021 | $ 38,674,049 | $ 37,727,229

X
- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) -Publisher SEC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (2) -Publisher SEC Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-7 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-14 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 80 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-80 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=wtfc_EarlyBuyOutLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=wtfc_NonConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=wtfc_HomeEquityPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=wtfc_ResidentialRealEstateLoansExcludingEarlyBuyOutLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=wtfc_PremiumFinanceReceivablePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=wtfc_PropertyAndCasualtyInsuranceLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=wtfc_LifeInsuranceLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=wtfc_ConsumerAndOtherPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=wtfc_TotalFinancingReceivablePortfolioSegmentExcludingEarlyBuyOutLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetNotPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |