Wintrust Financial Corporation is a financial holding company. It provides personal and commercial banking services to customers located in the Chicago and in southeastern Wisconsin through its 15 wholly owned banking subsidiaries, as well as origination and purchase of residential mortgages for sale into the secondary market through Wintrust Mortgage, a division of Barrington Bank and Trust Company, N.A. It provides specialty finance services, including financing for the payment of commercial insurance premiums and life insurance premiums. In May 2013, Wintrust Financial Corp acquired the entire share capital of First Lansing Bancorp Inc. In October 2013, the Company�s subsidiary, Barrington Bank &Trust Company, N.A. through its division Wintrust Mortgage, acquired the mortgage banking business of Surety Financial Services (Surety) of Sherman Oaks, California. In October 2013, the Company acquired Diamond Bancorp, Inc.