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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On January 14, 2016, the Company announced the signing of a definitive agreement to acquire Generations Bancorp, Inc. ("Generations"). Generations is the parent company of Foundations Bank which operates one banking location in Pewaukee, Wisconsin. At September 30, 2015, Foundations Bank had approximately $125 million in assets, approximately $72 million in loans, and approximately $97 million in deposits. On January 21, 2016, the Company acquired $15.0 million of trust preferred securities issued by Wintrust Capital Trust VIII from a third-party investor. The purchase effectively extinguished $15.0 million of junior subordinated debentures related to Wintrust Capital Trust VIII and resulted in a $4.3 million gain.