XML 85 R72.htm IDEA: XBRL DOCUMENT
v3.22.4

Allowance for Credit Losses (Summary of the Post-Modification Balance of Loans Restructured) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) contract | Dec. 31, 2021 USD ($) contract | Dec. 31, 2020 USD ($) contract
Financing Receivables, Modifications [Line Items] |  |  |
TDRs, count | contract | 40 | 64 | 124
TDRs, balance | $ | $ 13,377 | $ 13,869 | $ 45,872
Extension at Below Market Terms |  |  |
Financing Receivables, Modifications [Line Items] |  |  |
TDRs, count | contract | 36 | 51 | 102
TDRs, balance | $ | $ 5,558 | $ 8,931 | $ 36,467
Reduction of Interest Rate |  |  |
Financing Receivables, Modifications [Line Items] |  |  |
TDRs, count | contract | 22 | 20 | 42
TDRs, balance | $ | $ 4,265 | $ 5,079 | $ 7,721
Modification To Interest-only Payments |  |  |
Financing Receivables, Modifications [Line Items] |  |  |
TDRs, count | contract | 5 | 10 | 15
TDRs, balance | $ | $ 9,081 | $ 4,340 | $ 10,479
Forgiveness of Debt |  |  |
Financing Receivables, Modifications [Line Items] |  |  |
TDRs, count | contract | 0 | 0 | 1
TDRs, balance | $ | $ 0 | $ 0 | $ 432
Commercial real estate | Non-construction |  |  |
Financing Receivables, Modifications [Line Items] |  |  |
TDRs, count | contract | 3 | 5 | 18
TDRs, balance | $ | $ 8,833 | $ 2,944 | $ 19,281
Commercial real estate | Non-construction | Extension at Below Market Terms |  |  |
Financing Receivables, Modifications [Line Items] |  |  |
TDRs, count | contract | 1 | 4 | 15
TDRs, balance | $ | $ 1,178 | $ 2,401 | $ 14,657
Commercial real estate | Non-construction | Reduction of Interest Rate |  |  |
Financing Receivables, Modifications [Line Items] |  |  |
TDRs, count | contract | 1 | 2 | 3
TDRs, balance | $ | $ 1,178 | $ 656 | $ 921
Commercial real estate | Non-construction | Modification To Interest-only Payments |  |  |
Financing Receivables, Modifications [Line Items] |  |  |
TDRs, count | contract | 3 | 1 | 8
TDRs, balance | $ | $ 8,833 | $ 113 | $ 5,853
Commercial real estate | Non-construction | Forgiveness of Debt |  |  |
Financing Receivables, Modifications [Line Items] |  |  |
TDRs, count | contract | 0 | 0 | 0
TDRs, balance | $ | $ 0 | $ 0 | $ 0
Residential real estate and other |  |  |
Financing Receivables, Modifications [Line Items] |  |  |
TDRs, count | contract | 32 | 43 | 85
TDRs, balance | $ | $ 4,076 | $ 5,851 | $ 14,229
Residential real estate and other | Extension at Below Market Terms |  |  |
Financing Receivables, Modifications [Line Items] |  |  |
TDRs, count | contract | 31 | 40 | 70
TDRs, balance | $ | $ 4,075 | $ 5,683 | $ 13,721
Residential real estate and other | Reduction of Interest Rate |  |  |
Financing Receivables, Modifications [Line Items] |  |  |
TDRs, count | contract | 20 | 17 | 38
TDRs, balance | $ | $ 3,002 | $ 4,123 | $ 5,809
Residential real estate and other | Modification To Interest-only Payments |  |  |
Financing Receivables, Modifications [Line Items] |  |  |
TDRs, count | contract | 0 | 9 | 1
TDRs, balance | $ | $ 0 | $ 4,227 | $ 190
Residential real estate and other | Forgiveness of Debt |  |  |
Financing Receivables, Modifications [Line Items] |  |  |
TDRs, count | contract | 0 | 0 | 0
TDRs, balance | $ | $ 0 | $ 0 | $ 0

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 No definition available. + Details
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after troubled debt restructuring, of modified financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=us-gaap_InterestRateBelowMarketReductionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=wtfc_ModificationToInterestOnlyPaymentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=us-gaap_PrincipalForgivenessMember
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=wtfc_NonConstructionLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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