MB Financial Completes First SecurityFed Financial Merger

Business Wire, June 1, 2004

Business Editors

CHICAGO--(BUSINESS WIRE)--June 1, 2004

MB Financial, Inc. (NASDAQ:MBFI), parent of MB Financial Bank, N.A., and Union Bank, N.A., has completed its merger with First SecurityFed Financial, Inc.(NASDAQ:FSFF), it was announced here today. MB Financial, Inc. continues as the surviving corporation as a result of the transaction that was first announced in January.

The joint announcement of the transaction completion was made by Mitchell Feiger, President and CEO of MB Financial and Julian Kulas, President and CEO of First SecurityFed Financial. Feiger expects the integration of First Security Federal Savings Bank into MB Financial Bank to occur during the third quarter of 2004. The institution will continue to be known as First Security Federal Savings Bank until the integration is completed.

MB Financial and its Illinois-based banking and financial services unit -- MB Financial Bank -- will have 38 locations in the Chicago area following the integration of First SecurityFed. First Security has two offices and one drive-thru location in Chicago, one location in Palatine, as well as a full service branch in Philadelphia, PA.

The First Security customer base represents a diverse mix of businesses and individuals. It also has significant customer relationships with the Ukrainian, Polish and Hispanic communities. First Security's ethnic concentration (including both individual and business relationships), its growing construction and real estate finance capabilities and its geographic locations are highly compatible with MB Financial.

"MB Financial continues to strengthen customer relationships through the addition of products, professional expertise and choices through which banking can be done," said Feiger. "We are looking forward to a smooth transition and delivering the same high quality personalized service that First Security customers are accustomed to enjoying."

"In addition to offering First Security customers the same general banking products to which they are accustomed, we will offer them many new MB Financial products and services which they may find helpful in dealing with today's complex financial world."

"We believe our customers will greatly benefit from this merger," said Kulas. "MB Financial knows how to serve the needs of its ethnic customers while also providing a comprehensive array of services through multiple channels. This will include the addition of Ukrainian telephone banking to the English, Polish, Hispanic and Korean system currently offered."

Over the years, First Security has helped establish and sustain the Heritage Foundation, which supports the ethnic communities where First Security offices are located. To emphasize its commitment to First Security's customers and communities, MB Financial will be contributing $1 million to further the Foundation's work.

Kulas will become a member of the MB Financial Bank Board of Directors, remain a director of the Heritage Foundation and retain his office at 936 N. Western Ave. in Chicago. Paul Nadzikewycz, Chairman of First SecurityFed Financial, also will become an MB Financial Bank Board member and remain on the Heritage Foundation Board.

MB Financial, Inc. is a Chicago-based financial holding company which is traded on the NASDAQ as "MBFI." MB Financial has more than $4.4 billion in assets. Information about MB Financial can be found at www.mbfinancial.com. MB Financial operates through MB Financial Bank, N.A. in Illinois and Union Bank, N.A. in Oklahoma.

MB Financial Bank (www.mbfinancial.com) is a locally operated financial institution that has been delivering competitive personalized service for more than 90 years to privately owned companies as well as to individuals who live and work in the Chicago metropolitan area. MB Financial Bank's holding company, MB Financial, Inc., is traded on the NASDAQ as "MBFI."

This news release may contain forward-looking statements that involve risk and uncertainties, with respect to the results of operations and other uncertainties that may not be known or anticipated by the company. While management of the company uses its best efforts to be accurate in making forward-looking statements, any such statements are subject to risks and uncertainties that could cause the Company's actual results to vary materially from the future results indicated in such forward-looking statements.