FIRST FINANCIAL BANK TO CONSTRUCT NEW BANK BUILDING

ORANGE, Texas, August 21, 2017 – The Board of Directors of First Financial Bank, N.A., today announced the construction of a new Southeast Texas Regional Banking Center at the corner of Park and North 16^th Street. Construction of the new banking center is expected to be complete in the fall of 2018, at which time the City of Orange will occupy the current bank location.

“We believe this is an extremely positive development for our bank, the City and our entire community,” Stephen Lee, President of First Financial Bank, Southeast Region said. “First Financial Bank has been serving the banking and mortgage needs of Orange, Texas for more than 60 years and this new state of the art banking center will ensure we continue our leadership role in the community for years to come.

The new location will include more than 12,500 square feet of office and retail space, with a drive thru featuring five extra wide lanes and a 24 hour deposit taking ATM. The new banking center will have improved access from 16^th Street, Park Avenue and Cherry Lane and feature a 15^th Street entrance for our First Financial Mortgage customers.

About First Financial Bank, N.A.

First Financial Bank, N.A. is a wholly owned subsidiary of First Financial Bankshares, Inc., a financial holding company, and operates multiple banking regions with 69 locations in Texas including Abilene, Acton, Albany, Aledo, Alvarado, Beaumont, Boyd, Bridgeport, Brock, Burleson, Cisco, Cleburne, Clyde, Conroe, Cut and Shoot, Decatur, Eastland, Fort Worth, Glen Rose, Granbury, Grapevine, Hereford, Huntsville, Keller, Magnolia, Mauriceville, Merkel, Midlothian, Mineral Wells, Montgomery, Moran, New Waverly, Newton, Odessa, Orange, Port Arthur, Ranger, Rising Star, Roby, San Angelo, Southlake, Stephenville, Sweetwater, Tomball, Trent, Trophy Club, Vidor, Waxahachie, Weatherford, Willis, and Willow Park.

The Company also operates First Financial Trust & Asset Management Company, N.A., with seven locations and First Technology Services, Inc., a technology operating company.

The Company is listed on The NASDAQ Global Select Market under the trading symbol FFIN. For more information about First Financial Bankshares, please visit our website at HYPERLINK "http://www.ffin.com/" http://www.ffin.com.

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Certain statements contained herein may be considered "forward-looking statements" as defined in the Private Securities Litigation Reform Act of 1995.

These statements are based upon the belief of the Company's management, as well as assumptions made beyond information currently available to the Company's management, and may be, but not necessarily are, identified by such words as "expect", "plan", "anticipate", "target", "forecast" and "goal".

Because such "forward-looking statements" are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements.

Factors that could cause actual results to differ materially from the Company's expectations include competition from other financial institutions and financial holding companies; the effects of and changes in trade, monetary and fiscal policies and laws, including interest rate policies of the Federal Reserve Board; changes in the demand for loans; fluctuations in value of collateral and loan reserves; inflation, interest rate, market and monetary fluctuations; changes in consumer spending, borrowing and savings habits; and acquisitions and integration of acquired businesses, and similar variables.

Other key risks are described in the Company's reports filed with the Securities and Exchange Commission, which may be obtained under "Investor Relations-Documents/Filings" on the Company's Web site or by writing or calling the Company at 325.627.7155.

Except as otherwise stated in this news announcement, the Company does not undertake any obligation to update publicly or revise any forward-looking statements