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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2023
Feb. 26, 2024
Jun. 30, 2023
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-35077    
Entity Registrant Name Wintrust Financial Corp    
Entity Incorporation, State or Country Code IL    
Entity Tax Identification Number 36-3873352    
Entity Address, Address Line One 9700 W. Higgins Road, Suite 800    
Entity Address, City or Town Rosemont    
Entity Address, State or Province IL    
Entity Address, Postal Zip Code 60018    
City Area Code 847    
Local Phone Number 939-9000    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 4,404,517,696
Entity Common Stock, Shares Outstanding (in shares)   61,472,818  
Documents Incorporated by Reference
Portions of the Proxy Statement for the Company’s Annual Meeting of Shareholders to be held on May 23, 2024 are incorporated by reference into Part III.
    
Amendment Flag false    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2023    
Entity Central Index Key 0001015328    
Common Stock, no par value      
Entity Information [Line Items]      
Title of 12(b) Security Common Stock, no par value    
Trading Symbol WTFC    
Security Exchange Name NASDAQ    
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D, no par value      
Entity Information [Line Items]      
Title of 12(b) Security Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D, no par value    
Trading Symbol WTFCM    
Security Exchange Name NASDAQ    
6.875% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series E, no par value      
Entity Information [Line Items]      
Title of 12(b) Security 6.875% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series E, no par value    
Trading Symbol WTFCP    
Security Exchange Name NASDAQ