FOR IMMEDIATE RELEASE Friday, September 12, 1997 S&T Bancorp Announces Board Appointments Indiana, Pennsylvania (Nasdaq NMS: STBA) - Robert D. Duggan, chairman and chief executive officer of S&T Bancorp, has announced that Jeffrey D. Grube and Alan Papernick have been appointed to the S&T Bancorp Board of Directors. According Duggan, "We look forward to a long association with our new Board members and are delighted they were willing to accept an appointment to our Board of Directors. We are fortunate to have directors and staff with a common commitment focused toward ensuring that S&T continues to be a strong, competitive and profitable bank, serving the needs of local people." Mr. Grube is president of B.F.G. Electroplating and Manufacturing Company. The Punxsutawney, PA-based firm specializes in electroplating manufactured parts. Mr. Grube currently serves as vice chairman of the Punxsutawney Area Hospital Board of Directors; secretary-treasurer of the Punxsutawney Planning and Zoning Commission; treasurer of the Punxsutawney Area Arts and Recreation Center as well as being a member of the Jefferson County Development Council. Mr. Grube was graduated from Carnegie Mellon University, Pittsburgh, with a bachelor of science degree in electrical engineering. He resides in Punxsutawney with his wife, Ruth. They are the parents of two children, Michael and Melissa. Mr. Papernick, an attorney, is senior partner in the Pittsburgh law firm, Papernick and Gefsky. He has served on the boards of the Monroeville Rotary Club; the Monroeville Area Chamber of Commerce; the Congregation Beth Shalom; Riverview Center for Seniors and the Westmoreland Country Club. In addition. Mr. Papernick is rated "AV" by the Martin Hubbell Legal Publishing Directory and has been recognized in the Best Lawyers of American listing for five consecutive years. He frequently acts as a guest lecturer for Bar Association groups throughout Pennsylvania. Mr. Papernick was graduated from Duquesne University, Pittsburgh, with a juris doctorate degree and the University of Pittsburgh with a bachelor of arts degree. He resides in Pittsburgh with his wife, Judy. They are the parents of three children, Stephen, Amy and Lisa. Headquartered in Indiana, Pennsylvania, S&T Bank, the principal subsidiary of S&T Bancorp, Inc., operates 38 offices in Allegheny, Armstrong, Clearfield, Indiana, Jefferson, and Westmoreland counties. With assets of $1.8 billion, S&T Bancorp stock is traded on the Nasdaq National Market System under the symbol STBA.