This Statement confirms that the undersigned, Mr. Myles D. Sampson,
 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/ Myles D. Sampson

