Exhibit 99.1

FIRST FINANCIAL BANKSHARES ANNOUNCES EARNINGS FOR THIRD QUARTER 2020

ABILENE, Texas, October 22, 2020—First Financial Bankshares, Inc. (NASDAQ: FFIN) today reported earnings for the third quarter of 2020 of $52.86 million compared with earnings of $43.08 million for the third quarter of 2019, representing a 22.69 percent increase. Basic and diluted earnings per share were $0.37 for the third quarter of 2020 compared with $0.32 for the third quarter of 2019.

All amounts for the three and nine months ended September 30, 2020, include the results of the Company’s acquisition of TB&T Bancshares, Inc. and its wholly-owned subsidiary, The Bank & Trust of Bryan/College Station, Texas, which was effective January 1, 2020.

“We are extremely pleased with our results for the third quarter and year-to-date reflecting our TEXAS STRONG initiative to navigate through the pandemic. Throughout this time, we have kept our doors open to allow our customers to keep their doors open as well. Our approach has proven to be very positive since approximately one-third of the PPP loans were made to prospects and noncustomers who couldn’t get them done through their own bank allowing us to grow considerably in loans and deposits as well as trust assets. I am extremely proud of the dedication, hard work and excellent customer service that our 1,450 associates have provided through this time by guiding our customers through the PPP loan process, bringing an unbelievable amount of new business to the Company, and executing a record number of mortgages, all of which has certainly helped our bottom line. As already proven, we are well positioned to navigate through this environment with strong reserves, liquidity, superior capital levels, and a team that doesn’t allow pandemics or hurricanes to slow us down. We are optimistic about finishing the year strong and rolling right into 2021,” said F. Scott Dueser, Chairman, President and CEO of First Financial Bankshares, Inc.

Net interest income for the third quarter of 2020 was $89.21 million, up $16.57 million from net interest income of $72.64 million for the third quarter of 2019. The net interest margin on a tax equivalent basis was 3.75 percent for the quarter compared to 3.94 percent a year ago. Net interest income was positively impacted by a $2.33 billion increase in average-earning assets to $9.80 billion at September 30, 2020, from both organic and acquired growth, partially offset by a 52 basis point decline in the yield on interest-earning assets to 3.84 percent for the quarter; and $1.85 million in accretion from acquired loans this quarter compared to $415 thousand in the same quarter last year. Partially offsetting these amounts was a $5.79 million, or 54 basis points, decrease in funding costs on interest-bearing liabilities from the same quarter a year ago.

During the third and second quarters of 2020, the Company recognized $2.83 million each quarter in deferred net loan fees on Paycheck Protection Program (‘PPP”) loans. PPP loans totaled $703.73 million at September 30, 2020 ($703.48 million and $430.84 million in average balances for the third quarter and year-to-date, respectively). The remainder of the PPP net deferred loan fees totaled $15.97 million at September 30, 2020 and continues to be amortized over the shorter of the repayment period or the contractual life of 24 months.

Accounting Standards Update (ASU) 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” (“CECL”), became effective for the Company on January 1, 2020. However, the pandemic-related legislation included an option for entities to delay the implementation of CECL until the earlier of the termination date of the national emergency declaration by the President, or December 31, 2020. The Company elected to delay implementation of CECL and has calculated and recorded the provision for credit losses for the quarter and year-to-date under the incurred loss model that existed prior to CECL. The Company is prepared to adopt CECL during the fourth quarter, retroactively effective as of January 1, 2020, which will likely require adjusting previously reported provisions for credit losses in the previous quarters of 2020.

The provision for credit losses was $9.00 million in the third quarter of 2020, including $1.50 million related to the provision for unfunded commitments, compared with $450 thousand in the third quarter of 2019. During the third quarter of 2020, net charge-offs totaled $409 thousand compared to $381 thousand in the third quarter of 2019. The Company’s provision for credit losses in the third quarter of 2020 continues to reflect uncertainty surrounding the economic impact caused by the pandemic and the decline in oil and gas prices. At September 30, 2020, the allowance for loan losses totaled $76.04 million, or 1.44 percent of loans held-for-investment (“loans” hereafter), or 1.66 percent of loans excluding PPP loans, compared to $51.89 million at September 30, 2019, or 1.27 percent of loans. Nonperforming assets as a percentage of loans and foreclosed assets totaled 0.81 percent at September 30, 2020, compared with 0.66 percent at September 30, 2019. Classified loans totaled $202.04 million at September 30, 2020, compared to $119.20 million at September 30, 2019.

In mid-March of 2020, the Company began offering deferral and extensions of principle and/or interest payments to selected borrowers on a case-by-case basis. During the third quarter, we provided new or extended existing customers deferrals and extensions on a case-by-case basis considering the current and projected profile of the borrower. At September 30, 2020, the Company had approximately 122 loans totaling $18.65 million in outstanding loans subject to deferral and extension agreements, representing 0.41 percent of outstanding loans, excluding PPP loans compared to 2,200 loans totaling $468.54 million, or 10.30 percent of outstanding loans, excluding PPP loans, at June 30, 2020.

At September 30, 2020, loans with oil and gas industry exposure, excluding PPP loans, totaled $118.57 million, or 2.58 percent of outstanding loans, excluding PPP loans. These loans comprised $26.82 million of classified loans including $6.80 million in nonaccrual loans. At September 30, 2020, the Company’s allowance for loan loss specific reserves on its oil and gas loan portfolio totaled 8.01 percent of total oil and gas loans, excluding PPP loans, and had net charge-offs totaling $801 thousand for the nine months ended September 30, 2020, respectively. There were no charge-offs associated with oil and gas loans during the third quarter of 2020.

In addition, at September 30, 2020, loans in the retail/restaurant/hospitality industries, excluding PPP loans, totaled $359.02 million or 7.82 percent of the Company’s outstanding loans, excluding PPP loans. These loans comprised $28.17 million of classified loans including $5.69 million in nonaccrual loans. Net charge-offs related to this portfolio totaled $26 thousand and $334 thousand for the three and nine months ended September 30, 2020, respectively.

Noninterest income in the third quarter of 2020 rose to $38.58 million from $28.67 million for the third quarter of 2019, as a result of the following:

Noninterest expense for the third quarter of 2020 totaled $55.59 million compared to $48.91 million in the third quarter of 2019, as a result of the following:

The Company’s efficiency ratio in the third quarter of 2020 was 42.45 percent compared with 47.54 percent in the third quarter of 2019.

As of September 30, 2020, consolidated assets for the Company totaled $10.57 billion compared to $8.11 billion at September 30, 2019. Loans totaled $5.29 billion at September 30, 2020, compared with loans of $4.10 billion at September 30, 2019, representing approximately 29 percent growth driven by the Bryan/College Station acquisition, PPP loans and organic growth. Deposits totaled $8.29 billion at September 30, 2020, compared to $6.40 billion at September 30, 2019, representing approximately 30 percent growth driven by organic growth and the acquisition. Noninterest-bearing deposits increased to 35.6 percent of total deposits at September 30, 2020 compared to 34.6 percent at September 30, 2019.

Shareholders’ equity rose to $1.62 billion as of September 30, 2020, compared to $1.21 billion at September 30, 2019, primarily from the Bryan/College Station acquisition, undistributed earnings and the net increase in the net unrealized gain on investment securities. At September 30, 2020, the Company’s capital ratios significantly exceeded all well-capitalized requirements.

About First Financial Bankshares, Inc.

Headquartered in Abilene, Texas, First Financial Bankshares, Inc. is a financial holding company that through its subsidiary, First Financial Bank, N.A., operates multiple banking regions with 78 locations in Texas, including Abilene, Acton, Albany, Aledo, Alvarado, Beaumont, Boyd, Bridgeport, Brock, Bryan, Burleson, College Station, Cisco, Cleburne, Clyde, Conroe, Cut and Shoot, Decatur, Eastland, El Campo, Fort Worth, Fulshear, Glen Rose, Granbury, Grapevine, Hereford, Huntsville, Keller, Kingwood, Magnolia, Mauriceville, Merkel, Midlothian, Mineral Wells, Montgomery, Moran, New Waverly, Newton, Odessa, Orange, Palacios, 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 ten 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, please visit our website at http://www.ffin.com.

####

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; economic impact of oil and gas prices and the pandemic, 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 and Filings” on the Company’s Website 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 because of new information, future events or otherwise.

FIRST FINANCIAL BANKSHARES, INC.

CONSOLIDATED FINANCIAL SUMMARY(UNAUDITED)

(In thousands, except share and per share data)

FIRST FINANCIAL BANKSHARES, INC.

SELECTED FINANCIAL DATA (UNAUDITED)

(In thousands)

FIRST FINANCIAL BANKSHARES, INC.

SELECTED FINANCIAL DATA (UNAUDITED)

(In thousands)