Exhibit 24.1

                          SUBSTITUTE POWER OF ATTORNEY


Under the terms of powers of attorney (each, a "Power of Attorney") previously
filed with the U.S. Securities and Exchange Commission, the undersigned was
appointed an attorney-in-fact for the following individuals to, among other
things, execute for and on behalf of the following individuals any Forms 3, 4
and 5 or any amendments thereto, in accordance with Section 16(a) of the
Securities Exchange Act of 1934, as amended, and the rules and regulations
promulgated thereunder:

Jimmy E. Allen
Sally E. Bowers
Henry W. Brockman, Jr.
Dallas G. Caudle, Jr.
James W. Cross, IV
Kevin A. Herrington
Richard E. Herrington
J. Myers Jones, III
David H. Kemp
Sally P. Kimble
David J. McDaniel
Sarah L. Meyerrose
Lee M. Moss
Paul M. Pratt, Jr.
Pamela J. Stephens
Melody J. Sullivan
Gregory E. Waldron
Benjamin Wynd

In accordance with the authority granted under each Power of Attorney, including
the power of substitution, the undersigned hereby appoints Nathanael P. Kibler
as substitute attorney-in-fact, on behalf of the individuals listed above, with
the power to exercise and execute all of the powers granted or conferred in the
original Power of Attorney. This Substitute Power of Attorney shall not revoke
the powers granted to the undersigned in any Power of Attorney.

This Substitute Power of Attorney shall remain in full force and effect until
the underlying Power of Attorney is revoked or terminated, unless earlier
revoked by the undersigned in a signed writing.

Dated: May 29, 2018.

/s/ Steven J. Eisen
---------------------------
Name: Steven J. Eisen
Title: Attorney-in-Fact