IRW Ibt Bancorp,

S&T Bancorp (STBA) announces the following Webcast: What: S&T Bancorp, Inc. - IBT Bancorp, Inc. Merger Discussion When: December 18, 2007 @ 10:00 AM Eastern Where: http://www.investorcalendar.com/ClientPage.asp?ID=124300 How: Live over the Internet -- Simply log on to the web at the address above. Contact: Robert E. Rout, (724)465-4825, robert.rout@stbank.net If you are unable to participate during the live webcast, the call will be available for replay at http://www.investorcalendar.com/ClientPage.asp?ID=124300 or http://www.investorcalendar.com/ About S&T Bancorp, Inc. Headquartered in Indiana, PA, S&T Bancorp, Inc. operates 46 offices within Allegheny, Armstrong, Blair, Butler, Cambria, Clarion, Clearfield, Indiana, Jefferson and Westmoreland counties. As of September 30, 2007, S&T Bancorp, Inc. had total assets of $3.4 billion, total net loans of $2.7 billion, total deposits of $2.6 billion and total equity of $327.9 million. S&T Bancorp, Inc. stock trades on the NASDAQ Global Select Market under the trading symbol "STBA." For more information, please visit www.stbancorp.com. About IBT Bancorp, Inc. IBT Bancorp, Inc. is the holding company for Irwin Bank which is a state chartered commercial bank that conducts its business from its main office in Irwin, Pennsylvania, nine branch offices, and a trust division located in the western Pennsylvania counties of Westmoreland and Allegheny. As of September 30, 2007, IBT Bancorp, Inc. had total assets of $773.8 million, total net loans of $480.7 million, total deposits of $580.5 million and total equity of $62.9 million. IBT Bancorp, Inc.'s common stock is traded on the American Stock Exchange under the symbol "IRW." For more information, please visit www.myirwinbank.com.