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v3.22.1

Revenue from Contracts with Customers (Narrative) (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 USD ($) subsidiary | Mar. 31, 2021 USD ($)
Revenue from Contract with Customer [Abstract] |  |
Number of wealth management subsidiaries | subsidiary | 4 |
Revenue recognized from contract liability balance | $ | $ 291 | $ 414

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 + Details
Name: | us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition Number of Wealth Management Subsidiaries + References No definition available. + Details
Name: | wtfc_NumberofWealthManagementSubsidiaries
Namespace Prefix: | wtfc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant