This Statement confirms that the undersigned, David G. Antolik,
 has authorized and designated each of Robert E. Rout, Wendy S. Bell or
Timothy P. McKee to execute and file on the undersigned's behalf all Forms
3, 4 and 5 (including any amendments thereto) that the undersigned may be
required to file with the U.S. Securities and Exchange Commission as a result
of the undersigned's ownership of or transactions in securities of S&T Bancorp,
Inc.  The authority of Robert E. Rout, Wendy S. Bell or Timothy P. McKee under
this Statement shall continue until the undersigned is no longer required to
file Forms 3, 4 and 5 with regard to his/her ownership of or transactions in
securities of S&T Bancorp, Inc., unless earlier revoked in writing.  The
undersigned acknowledges that Robert E. Rout, Wendy S. Bell or Timothy P.
McKee are not assuming any of the undersigned's responsibilities to comply
with Section 16 of the Securities Exchange Act of 1934.


/s/ David G. Antolik

