POWER OF ATTORNEY
Know all by these present that the undersigned hereby constitutes
and appoints each of Paul D. Borja, Christine M. Reid and Jan M.
Klym, signing singly, the undersigneds
true and lawful attorney-in-fact to
execute for and on behalf of the undersigned, in the undersigneds
capacity as an executive officer of Flagstar Bancorp, Inc.,
the Company, Forms 3, 4, and 5 in accordance
with Section 16 of the Securities Exchange Act of 1934 and the
rules thereunder do and perform any and all acts for and on behalf
of the undersigned which may be necessary or desirable to complete
and execute any such Form 3, 4, or 5 and timely file such form
with the United States Securities and Exchange Commission and
any stock exchange or similarly authority; and 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 this Power of Attorney shall be in such form
and shall contain such terms and conditions as such attorney-in-fact
may approve in such attorney-in-facts discretion.
The undersigned hereby grants to each such attorney-in-fact full power
and authority to do and perform any and every act and thing whatsoever
requisite, necessary, or proper to be done in the exercise of any of
the rights and powers herein granted, as fully to all intents and
purposes as the undersigned might or could do if personally present,
with full power of substitution or revocation, hereby ratifying and
confirming all that such attorney-in-fact, or such attorney-in-facts
substitute or substitutes, shall lawfully do or cause to be done
by virtue of this power of attorney and the rights and powers
herein granted.  The undersigned further agrees to indemnify and hold
the attorney-in-fact free and harmless from and against any and all
liabilities, costs, damages, judgments, attorneys fees and
disbursements, expenses, losses or liabilities of any kind or nature
which may incur or sustain as a result of any action taken by him or
her in good faith hereunder.  The undersigned acknowledges that the
foregoing attorneys-in-fact, in serving in such capacity at the
request of the undersigned, are not assuming, nor is the Company
assuming, any of the undersigneds responsibilities to comply
with Section 16 of the Securities Exchange Act of 1934.
The Power of Attorney shall remain in full force and effect until
the undersigned is no longer required to file Forms 3, 4, and 5
with respect to the undersigneds holdings of and transactions in
securities issued by the Company, unless earlier revoked by the
undersigned in a signed writing delivered to the foregoing
attorneys-in-fact.
IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed as of this 6th day of January, 2021.
/s/ Karen Buck