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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On August 1, 2018, the Company acquired Chicago Shore Corporation ("CSC"). CSC was the parent company of Delaware Place Bank, which had one banking location in Chicago, Illinois. As of June 30, 2018, Delaware Place Bank had approximately $247 million in assets, approximately $161 million in loans and approximately $216 million in deposits. Delaware Place Bank was merged into Wintrust’s wholly-owned banking subsidiary, Wintrust Bank, and its banking location operates as a branch of Wintrust Bank.