MB Financial Inc is a financial holding company. The company operates scores of banking offices located primarily in the Chicago metropolitan area through its bank subsidiary, MB Financial Bank. The bank offers an array of financial services primarily to small and middle market businesses and individuals in the markets it serves. Its primary business segments include banking, leasing, and mortgage banking. The company emphasizes and has historically grown through a number of acquisitions. Its banking segment has the following primary lines of business, including commercial banking, lease banking, retail banking, and wealth management. Its loan portfolio is concentrated in business loans, and a substantial portion is secured by real estate.