POWER OF ATTORNEY
For Executing Forms 3, 4 and 5 and 144

Know all by these present that the undersigned constitutes and appoints each
of Randall J. Erickson, Lynn M. Floeter, Marie A. Radtke and Jodi Rosenthal
signing singly, his/her true and lawful attorney-in-fact to:

(1)
execute for and on behalf of the undersigned Forms 3, 4 and 5 in
accordance with Section 16(a) of the Securities Exchange Act of 1934
and the rules thereunder;


(2)
execute for and on behalf of the undersigned notices on Form 144 in
accordance with Rule 144 under the Securities Act of 1933;


(3)
do and perform any and all acts for and on behalf of the undersigned
which may be necessary or desirable to complete the execution of any
such Forms 3, 4 or 5 or Form 144 and the timely filing of such forms
with the United States Securities and Exchange Commission and any
other authority; and


(4)
take any other action of any type whatsoever in connection with the
foregoing which, in the opinion of such attorney-in-fact, may be of
benefit to, in the best interest of, or legally required by, the undersigned,
it being understood that the documents executed by such attorney-in-fact
on behalf of the undersigned pursuant to the Power of Attorney shall
be in such form and shall contain such terms and conditions as such
attorney-in-fact may approve in his or her discretion.

The undersigned hereby grants to each such attorney-in-fact full power and
authority to do and perform all and every act and thing whatsoever requisite,
necessary and proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as such attorney-in-fact
might or could do if personally present, with full power of substitution or
revocation, cause to be done by virtue of this power of attorney and the rights
and powers herein granted.  The undersigned acknowledges that the foregoing
attorneys-in-fact, in serving in such capacity at the request of the
undersigned,are not assuming any of the undersigned?s responsibilities to
comply with Section 16 of the Securities Exchange Act of 1934 and the rules
thereunder or Rule 144 under the Securities Act of 1933.  This Power of
Attorney shall be a durable power of attorney and shall not be affected by
subsequent disability or incapacity of the undersigned.

IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed as of this 15th day of October, 2018.

/s/ Angie DeWitt