v3.25.1
Cover
Jun. 13, 2025
Document Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jun. 13, 2025
Entity File Number 001-35077
Entity Registrant Name WINTRUST FINANCIAL CORPORATION
Entity Central Index Key 0001015328
Entity Tax Identification Number 36-3873352
Entity Incorporation, State or Country Code IL
Entity Address, Address Line One 9700 W. Higgins Road
Entity Address, Address Line Two 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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common stock, no par value  
Document 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  
Document 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
Percentage 6. 875 Fixed Rate Reset Non Cumulative Perpetual Preferred Stock [Member]  
Document 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
Percentage 7. 875 Fixed Rate Reset Non Cumulative Perpetual Preferred Stock [Member]  
Document Information [Line Items]  
Title of 12(b) Security 7.875% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series F, no par value
Trading Symbol WTFCN
Security Exchange Name NASDAQ