POWER OF ATTORNEY

Know all by these presents, that the undersigned hereby constitutes and appoints
each of Claire W. Tucker, Rob Anderson, Wes Scott, Brent Moreland, Steffen
Arters, and Donovan Sowder or either of them signing singly, and with full power
of substitution, the undersigned's true and lawful attorney-in-fact to:

(1)   to the extent necessary, prepare, execute in the undersigned's name and on
the undersigned's behalf, and submit to the U.S. Securities and Exchange
Commission (the "SEC") a Form ID, including amendments thereto, and any other
documents necessary or appropriate to obtain codes and passwords enabling the
undersigned to make electronic filings with the SEC of reports required by
Section 16(a) of the Securities Exchange Act of 1934 or any rule or regulation
of the SEC;

(2)   execute for and on behalf of the undersigned, in the undersigned's
capacity as beneficial owner of securities of CapStar Financial Holdings, Inc.
(the "Company"), Form 144, 3, 4, 5 and any Schedules 13D or 13G in accordance
with Section 16(a) of the Securities Exchange Act of 1934, as amended, and the
rules thereunder;

(3)   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 144, 3, 4, 5
and any Schedules 13D or 13G, complete and execute any amendment or amendments
thereto, and timely file any such form with the SEC and any stock exchange or
similar authority, including completing and executing a Uniform Application for
Access Codes to File on Edgar on Form ID; 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 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-fact's 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-fact's 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 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 undersigned's responsibilities to comply
with Section 16 of the Securities Exchange Act of 1934.

This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Form 144, 3, 4, 5 and any Schedules
13D or 13G with respect to the undersigned's 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 1st day of November, 2018.


                                        By: /s/ Myra NanDora Jenne
                                           -------------------------------------
                                        Name:  Myra NanDora Jenne
                                        Title:  Director