EXHIBIT 99.1

•Fourth quarter net income of $17.3 million;

•Linked quarter loan growth of 2.3%;

•Fourth quarter earnings per diluted common share of $0.57;

•Annualized return on fourth quarter average assets of 0.85%;

•Annualized return on fourth quarter average tangible common equity of 13.10%(1); and

•Nonperforming assets remain low at 0.05% of total assets.

Tyler, Texas (January 26, 2024) Southside Bancshares, Inc. (“Southside” or the “Company”) (NASDAQ: SBSI) today reported its financial results for the quarter and year ended December 31, 2023. Southside reported net income of $17.3 million for the three months ended December 31, 2023, a decrease of $10.4 million, or 37.4%, compared to $27.7 million for the same period in 2022. Earnings per diluted common share decreased $0.30, or 34.5%, to $0.57 for the three months ended December 31, 2023, from $0.87 for the same period in 2022. The annualized return on average shareholders’ equity for the three months ended December 31, 2023, was 9.31%, compared to 15.08% for the same period in 2022.  The annualized return on average assets was 0.85% for the three months ended December 31, 2023, compared to 1.47% for the same period in 2022.

“During the latter part of the fourth quarter, we sold approximately $388 million of lower-yielding available for sale securities and recorded a $10.4 million net loss,” stated Lee R. Gibson, President and Chief Executive Officer of Southside. “The proceeds from these sales were largely reinvested in premium U.S. Agency mortgage-backed pools and to a lesser extent in loans. This reinvestment is estimated to increase net interest income and provide for a two-year payback of the loss incurred. Linked quarter, net interest income increased $1.2 million, while the net interest margin decreased slightly three basis points. Linked quarter, loans increased $103.9 million, or 2.3% and deposits increased $200.1 million, or 3.2%. The increase in deposits was primarily due to an increase in public funds.”

Operating Results for the Three Months Ended December 31, 2023

Net income was $17.3 million for the three months ended December 31, 2023, compared to $27.7 million for the same period in 2022, a decrease of $10.4 million, or 37.4%. Earnings per diluted common share were $0.57 and $0.87 for the three months ended December 31, 2023 and 2022, respectively. The decrease in net income was primarily a result of the decreases in noninterest income and net interest income and the increase in noninterest expense, partially offset by the decrease in income tax expense. Annualized returns on average assets and average shareholders’ equity for the three months ended December 31, 2023 were 0.85% and 9.31%, respectively, compared to 1.47% and 15.08%, respectively, for the three months ended December 31, 2022.  Our efficiency ratio and tax-equivalent efficiency ratio(1) were 53.30% and 50.86%, respectively, for the three months ended December 31, 2023, compared to 48.92% and 46.38%, respectively, for the three months ended December 31, 2022, and 54.86% and 52.29%, respectively, for the three months ended September 30, 2023.

Net interest income for the three months ended December 31, 2023 was $54.5 million, compared to $56.8 million for the same period in 2022, a decrease of 4.1%. The decrease in net interest income was due to the increase in interest expense on our interest bearing liabilities due to higher interest rates and an increase in the average balance of our interest bearing liabilities, partially offset by the increase in interest income, a result of the increase in the average yield and average balance of interest earning assets. Linked quarter, net interest income increased $1.2 million, or 2.3%, compared to $53.3 million during the three months ended September 30, 2023. The increase in net interest income was largely due to the increases in the average balance of interest earning assets and average yield of interest earning assets, partially offset by the increases in the average rate paid on our interest bearing liabilities and the average balance of interest bearing liabilities.

Our net interest margin and tax-equivalent net interest margin(1) decreased to 2.83% and 2.99%, respectively, for the three months ended December 31, 2023, compared to 3.19% and 3.40%, respectively, for the same period in 2022. Linked quarter, net interest margin and tax-equivalent net interest margin(1) decreased from 2.85% and 3.02%, respectively for the three months ended September 30, 2023.

Noninterest income was $2.5 million for the three months ended December 31, 2023, a decrease of $8.3 million, or 76.8%, compared to $10.8 million for the same period in 2022. On a linked quarter basis, noninterest income decreased $8.3 million, or 76.9%, compared to the three months ended September 30, 2023. Both decreases were due to a net loss on sale of securities available for sale (“AFS”) of $10.4 million for the three months ended December 31, 2023, partially offset by an increase in bank owned life insurance (“BOLI”) income related to a $2.0 million death benefit realized in the fourth quarter of 2023.

Noninterest expense increased $1.6 million, or 4.8%, to $35.2 million for the three months ended December 31, 2023, compared to $33.6 million for the same period in 2022, due to increases in other noninterest expense, software and data processing expense and FDIC insurance, partially offset by a decrease in net occupancy expense. On a linked quarter basis, noninterest expense decreased by $0.4 million, or 1.0%, compared to the three months ended September 30, 2023.

Income tax expense decreased $2.1 million, or 48.6%, for the three months ended December 31, 2023, compared to the same period in 2022. On a linked quarter basis, income tax expense decreased $0.9 million, or 29.3%. Our effective tax rate (“ETR”) decreased to 11.3% for the three months ended December 31, 2023, compared to 13.4% for the three months ended December 31, 2022, and decreased from 14.5% for the three months ended September 30, 2023. The lower ETR for the three months ended December 31, 2023 compared to the same period in 2022, was primarily due to an increase in tax-exempt income as a percentage of pre-tax income.

Operating Results for the Year Ended December 31, 2023

Net income was $86.7 million for the year ended December 31, 2023, compared to $105.0 million for the same period in 2022, a decrease of $18.3 million, or 17.5%. Earnings per diluted common share were $2.82 for the year ended December 31, 2023, compared to $3.26 for the same period in 2022, a decrease of 13.5%. The decrease in net income was primarily a result of the increase in noninterest expense, the decrease in noninterest income and the increase in provision for credit losses, partially offset by the increase in net interest income. Returns on average assets and average shareholders’ equity for the year ended December 31, 2023 were 1.11% and 11.50%, respectively, compared to 1.43% and 13.42%, respectively, for the year ended December 31, 2022.  Our efficiency ratio and tax-equivalent efficiency ratio(1) were 53.81% and 51.30%, respectively, for the year ended December 31, 2023, compared to 50.05% and 47.39%, respectively, for the year ended December 31, 2022.

Net interest income was $215.0 million for the year ended December 31, 2023, compared to $212.3 million for the same period in 2022, due to the increase in interest income, a result of the increase in the average yield and average balance of our interest earning assets, partially offset by the increase in average rate paid and average balance of our interest bearing liabilities.

Our net interest margin and tax-equivalent net interest margin(1) were 2.92% and 3.09%, respectively, for the year ended December 31, 2023, compared to 3.11% and 3.32%, respectively, for the same period in 2022. The decrease in net interest margin was due to larger average rate and balance increases on our interest-bearing liabilities when compared to the interest earning assets during the year ended December 31, 2023.

Noninterest income was $35.8 million for the year ended December 31, 2023, a decrease of $5.0 million, or 12.3%, compared to $40.9 million for the same period in 2022. The decrease was due to an increase in net loss on sale of securities AFS and a decrease in other noninterest income, partially offset by a net gain on sale of equity securities and an increase in BOLI income related to death benefits realized during the year ended December 31, 2023.

Noninterest expense was $140.6 million for the year ended December 31, 2023, compared to $130.3 million for the same period in 2022, an increase of $10.3 million, or 7.9%. The increase was due to increases in other noninterest expense, salaries and employee benefits, software and data processing expense, FDIC insurance and advertising, travel and entertainment.

Income tax expense decreased $0.2 million, or 1.2%, for the year ended December 31, 2023, compared to the same period in 2022. Our ETR was approximately 14.3% and 12.2% for the year ended December 31, 2023 and 2022, respectively. The higher ETR for the year ended December 31, 2023, as compared to the same period in 2022, was primarily due to a decrease in tax-exempt income as a percentage of pre-tax income.

Balance Sheet Data

At December 31, 2023, Southside had $8.28 billion in total assets, compared to $7.56 billion at December 31, 2022 and $7.97 billion at September 30, 2023.

Loans at December 31, 2023 were $4.52 billion, an increase of $376.8 million, or 9.1%, compared to $4.15 billion at December 31, 2022. Linked quarter, loans increased $103.9 million, or 2.3%, due to increases of $69.2 million in construction loans, $51.1 million in commercial real estate loans, and $7.2 million in 1-4 family residential loans. These increases were partially offset by a decrease of $18.9 million in commercial loans, $4.5 million in loans to individuals and $0.3 million in municipal loans. Loans held for sale at December 31, 2023 were $10.9 million, an increase of $10.2 million, compared to $667,000 at December 31, 2022. The increase was primarily due to the transfer of an $8.1 million commercial real estate loan relationship to loans held for sale that included a write down of $788,000 to fair value.

Securities at December 31, 2023 were $2.60 billion, a decrease of $22.4 million, or 0.9%, compared to $2.63 billion at December 31, 2022. Linked quarter, securities decreased $40.1 million, or 1.5%, from $2.64 billion at September 30, 2023.

Deposits at December 31, 2023 were $6.55 billion, an increase of $351.7 million, or 5.7%, compared to $6.20 billion at December 31, 2022. Linked quarter, deposits increased $200.1 million, or 3.2%, from $6.35 billion at September 30, 2023. During the three months ended December 31, 2023, public fund deposits increased $145.4 million, or 13.6%, and brokered deposits increased $38.4 million, or 4.9%, compared to September 30, 2023.

At December 31, 2023, we had 180,057 total deposit accounts with an average balance of $32,000. Our estimated uninsured deposits was 37.5% as of December 31, 2023. When excluding affiliate deposits (Southside-owned deposits) and public fund deposits (all collateralized), our total estimated deposits without insurance or collateral was 19.0% as of December 31, 2023. We continued to increase interest rates paid on deposits during the quarter in order to retain deposits and to remain competitive with current pricing in the market. Our noninterest bearing deposits represent approximately 21.2% of total deposits. Linked quarter, our cost of interest bearing deposits increased 25 basis points from 2.58% in the prior quarter to 2.83%. Linked quarter, our cost of total deposits increased 22 basis points from 1.98% in the prior quarter to 2.20%.

Our cost of interest bearing deposits increased 168 basis points, from 0.66% for the year ended December 31, 2022, to 2.34% for the year ended December 31, 2023. Our cost of total deposits increased 129 basis points, from 0.48% for the year ended December 31, 2022, to 1.77% for the year ended December 31, 2023.

Capital Resources and Liquidity

Our capital ratios and contingent liquidity sources remain solid. During the fourth quarter ended December 31, 2023, we purchased 146,580 shares of the Company’s common stock at an average price of $28.54 authorized pursuant to the Stock Repurchase Plan. Repurchases may be carried out in open market purchases, privately negotiated transactions or pursuant to any trading plan that might be adopted in accordance with Rule 10b5-1 of The Securities Exchange Act of 1934, as amended. The Company has no obligation to repurchase any shares under the Stock Repurchase Plan and may modify, suspend or discontinue the plan at any time. We have not purchased any common stock pursuant to the Stock Repurchase Plan subsequent to December 31, 2023.

We utilized the Federal Reserve’s Bank Term Funding Program (“BTFP”) to reduce our overall funding costs and to enhance our interest rate risk position. As of December 31, 2023, our BTFP borrowings of $117.7 million were at a cost of 4.37%. As of December 31, 2023, our total available contingent liquidity, net of current outstanding borrowings, was $2.22 billion, consisting of FHLB advances, Federal Reserve Discount Window and correspondent bank lines of credit.

Asset Quality

Nonperforming assets at December 31, 2023 were $4.0 million, or 0.05% of total assets, a decrease of $6.9 million, or 63.2%, compared to $10.9 million, or 0.14% of total assets, at December 31, 2022. The decrease in nonperforming assets was primarily due to the adoption of ASU 2022-02 on January 1, 2023, which allowed for the prospective exclusion of loan modifications that are performing but would have previously required disclosure as troubled debt restructures in nonperforming assets. Linked quarter, nonperforming assets decreased from $4.4 million at September 30, 2023 due to a decrease of $0.4 million, or 9.9%, in nonaccrual loans.

The allowance for loan losses totaled $42.7 million, or 0.94% of total loans, at December 31, 2023, compared to $36.5 million, or 0.88% of total loans, at December 31, 2022. The increase in the allowance as a percentage of total loans was primarily due to increased economic and repricing concerns forecasted in our CECL model when compared to December 31, 2022. The allowance for loan losses was $41.8 million, or 0.94% of total loans, at September 30, 2023.

For the three months ended December 31, 2023, we recorded a provision for credit losses for loans of $2.2 million, compared to $0.5 million and $6.3 million for the three months ended December 31, 2022 and September 30, 2023, respectively. We recorded a provision for credit losses for loans of $8.9 million and $1.9 million for the years ended December 31, 2023 and 2022, respectively. Net charge-offs were $1.3 million for the three months ended December 31, 2023, compared to net charge-offs of $0.5 million and $0.9 million for the three months ended December 31, 2022 and September 30, 2023, respectively. Net charge-offs were $2.8 million for the year ended December 31, 2023, compared to net charge-offs of $0.7 million for the year ended December 31, 2022.

We recorded a provision for credit losses for off-balance-sheet credit exposures of $0.1 million, $1.6 million and $0.6 million for the three month periods ending December 31, 2023, December 31, 2022 and September 30, 2023, respectively. We recorded a provision for credit losses for off-balance-sheet credit exposures of $0.2 million and $1.3 million for the years ended December 31, 2023 and 2022, respectively. The balance of the allowance for off-balance-sheet credit exposures at December 31, 2023 and 2022, was $3.9 million and $3.7 million, respectively, and is included in other liabilities.

Dividend

Southside Bancshares, Inc. declared a fourth quarter cash dividend of $0.35 per share and a special cash dividend of $0.02 per share on November 2, 2023, which was paid on December 7, 2023, to all shareholders of record as of November 22, 2023.

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(1) Refer to “Non-GAAP Financial Measures” below and to “Non-GAAP Reconciliation” at the end of the financial statement tables in this Earnings Release for more information and for a reconciliation of this non-GAAP financial measure to the nearest GAAP financial measure.

Conference Call

Southside's management team will host a conference call to discuss its fourth quarter and year ended December 31, 2023 financial results on Friday, January 26, 2024 at 11:00 a.m. CDT.  The conference call can be accessed by webcast, for listen-only mode, on the company website, https://investors.southside.com, under Events.

Those interested in participating in the question and answer session, or others who prefer to call-in, can register at https://register.vevent.com/register/BIf5050b70aa774d69bbaa7dd6b7a57b27 to receive the dial-in number and unique code to access the conference call seamlessly. While not required, it is recommended that those wishing to participate, register 10 minutes prior to the conference call to ensure a more efficient registration process.

For those unable to attend the live event, a webcast recording will be available on the company website, https://investors.southside.com, for at least 30 days, beginning approximately two hours following the conference call.

Non-GAAP Financial Measures

Our accounting and reporting policies conform to generally accepted accounting principles (“GAAP”) in the United States and prevailing practices in the banking industry. However, certain non-GAAP measures are used by management to supplement the evaluation of our performance. These include the following fully taxable-equivalent measures (“FTE”): (i) Net interest income (FTE), (ii) net interest margin (FTE), (iii) net interest spread (FTE), and (iv) efficiency ratio (FTE), which include the effects of taxable-equivalent adjustments using a federal income tax rate of 21% to increase tax-exempt interest income to a tax-equivalent basis. Interest income earned on certain assets is completely or partially exempt from federal income tax. As such, these tax-exempt instruments typically yield lower returns than taxable investments.

Net interest income (FTE), net interest margin (FTE) and net interest spread (FTE). Net interest income (FTE) is a non-GAAP measure that adjusts for the tax-favored status of net interest income from certain loans and investments and is not permitted under GAAP in the consolidated statements of income. We believe this measure to be the preferred industry measurement of net interest income and that it enhances comparability of net interest income arising from taxable and tax-exempt sources. The most directly comparable financial measure calculated in accordance with GAAP is our net interest income. Net interest margin (FTE) is the ratio of net interest income (FTE) to average earning assets. The most directly comparable financial measure calculated in accordance with GAAP is our net interest margin. Net interest spread (FTE) is the difference in the average yield on average earning assets on a tax-equivalent basis and the average rate paid on average interest bearing liabilities. The most directly comparable financial measure calculated in accordance with GAAP is our net interest spread.

Efficiency ratio (FTE).  The efficiency ratio (FTE) is a non-GAAP measure that provides a measure of productivity in the banking industry. This ratio is calculated to measure the cost of generating one dollar of revenue. The ratio is designed to reflect the percentage of one dollar which must be expended to generate that dollar of revenue. We calculate this ratio by dividing noninterest expense, excluding amortization expense on intangibles and certain nonrecurring expense by the sum of net interest income (FTE) and noninterest income, excluding net gain (loss) on sale of securities available for sale and certain nonrecurring impairments. The most directly comparable financial measure calculated in accordance with GAAP is our efficiency ratio.

These non-GAAP financial measures should not be considered alternatives to GAAP-basis financial statements and other bank holding companies may define or calculate these non-GAAP measures or similar measures differently. Whenever we present a non-GAAP financial measure in an SEC filing, we are also required to present the most directly comparable financial measure calculated and presented in accordance with GAAP and reconcile the differences between the non-GAAP financial measure and such comparable GAAP measure.

Management believes adjusting net interest income, net interest margin and net interest spread to a fully taxable-equivalent basis is a standard practice in the banking industry as these measures provide useful information to make peer comparisons. Tax-equivalent adjustments are reflected in the respective earning asset categories as listed in the “Average Balances with Average Yields and Rates” tables.

A reconciliation of our non-GAAP financial measures to the comparable GAAP financial measures is included at the end of the financial statement tables.

About Southside Bancshares, Inc.

Southside Bancshares, Inc. is a bank holding company with approximately $8.28 billion in assets as of December 31, 2023, that owns 100% of Southside Bank.  Southside Bank currently has 55 branches in Texas and operates a network of 73 ATMs/ITMs.

To learn more about Southside Bancshares, Inc., please visit our investor relations website at https://investors.southside.com. Our investor relations site provides a detailed overview of our activities, financial information and historical stock price data.  To receive email notification of company news, events and stock activity, please register on the website under Resources and Investor Email Alerts.  Questions or comments may be directed to Lindsey Bailes at (903) 630-7965, or lindsey.bailes@southside.com.

Forward-Looking Statements

Certain statements of other than historical fact that are contained in this press release and in other written materials, documents and oral statements issued by or on behalf of the Company may be considered to be “forward-looking statements” within the meaning of and subject to the safe harbor protections of the Private Securities Litigation Reform Act of 1995.  These forward-looking statements are not guarantees of future performance, nor should they be relied upon as representing management’s views as of any subsequent date.  These statements may include words such as “expect,” “estimate,” “project,” “anticipate,” “appear,” “believe,” “could,” “should,” “may,” “might,” “will,” “would,” “seek,” “intend,” “probability,” “risk,” “goal,” “target,” “objective,” “plans,” “potential,” and similar expressions.  Forward-looking statements are statements with respect to the Company’s beliefs, plans, expectations, objectives, goals, anticipations, assumptions, estimates, intentions and future performance and are subject to significant known and unknown risks and uncertainties, which could cause the Company's actual results to differ materially from the results discussed in the forward-looking statements.  For example, discussions of the effect of our expansion, benefits of the Share Repurchase Plan, trends in asset quality, capital, liquidity, the Company's ability to sell nonperforming assets, expense reductions, planned operational efficiencies and earnings from growth and certain market risk disclosures, including the impact of interest rates, tax reform, inflation, the impacts related to or resulting from other economic factors are based upon information presently available to management and are dependent on choices about key model characteristics and assumptions and are subject to various limitations.  By their nature, certain of the market risk disclosures are only estimates and could be materially different from what actually occurs in the future.  Accordingly, our results could materially differ from those that have been estimated. The most significant factor that could cause future results to differ materially from those anticipated by our forward-looking statements include the ongoing impact of higher inflation levels, higher interest rates and general economic and recessionary concerns, all of which could impact economic growth and could cause a reduction in financial transactions and business activities, including decreased deposits and reduced loan originations, our ability to manage liquidity in a rapidly changing and unpredictable market, supply chain disruptions, labor shortages and additional interest rate increases by the Federal Reserve.

Additional information concerning the Company and its business, including additional factors that could materially affect the Company’s financial results, is included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022, under “Part I - Item 1. Forward Looking Information” and “Part I - Item 1A. Risk Factors,” in the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2023 under “Part II - Item 1A. Risk Factors” and in the Company’s other filings with the Securities and Exchange Commission.  The Company disclaims any obligation to update any factors or to announce publicly the result of revisions to any of the forward-looking statements included herein to reflect future events or developments.

(1)Refer to “Non-GAAP Reconciliation” at the end of the financial statement tables in this Earnings Release for a reconciliation of this non-GAAP financial measure to the nearest GAAP financial measure.

(1)Pursuant to our adoption of ASU 2022-02, effective January 1, 2023, we prospectively discontinued the recognition and measurement guidance previously required on troubled debt restructures. As a result, “restructured” loans beginning March 31, 2023, exclude any loan modifications that are performing but would have previously required disclosure as troubled debt restructures.

(2)Refer to the “Non-GAAP Reconciliation” at the end of the financial statement tables in this Earnings Release for a reconciliation of this non-GAAP financial measure to the nearest GAAP financial measure.

(1)Refer to “Non-GAAP Reconciliation” at the end of the financial statement tables in this Earnings Release for a reconciliation of this non-GAAP financial measure to the nearest GAAP financial measure.

(1)Pursuant to our adoption of ASU 2022-02, effective January 1, 2023, we prospectively discontinued the recognition and measurement guidance previously required on troubled debt restructures. As a result, “restructured” loans beginning March 31, 2023, exclude any loan modifications that are performing but would have previously required disclosure as troubled debt restructures.

(2)Refer to the “Non-GAAP Reconciliation” at the end of the financial statement tables in this Earnings Release for a reconciliation of this non-GAAP financial measure to the nearest GAAP financial measure.

The tables that follow show average earning assets and interest bearing liabilities together with the average yield on the earning assets and the average rate of the interest bearing liabilities for the periods presented. The interest and related yields presented are on a fully taxable-equivalent basis and are therefore non-GAAP measures. See “Non-GAAP Financial Measures” and “Non-GAAP Reconciliation” for more information.

(1)Interest on loans includes net fees on loans that are not material in amount.

(2)For the purpose of calculating the average yield, the average balance of securities is presented at historical cost.

Note: As of December 31, 2023 and September 30, 2023, loans totaling $3.9 million and $4.3 million, respectively, were on nonaccrual status. Our policy is to reverse previously accrued but unpaid interest on nonaccrual loans; thereafter, interest income is recorded to the extent received when appropriate.

(1)Interest on loans includes net fees on loans that are not material in amount.

(2)For the purpose of calculating the average yield, the average balance of securities is presented at historical cost.

Note: As of June 30, 2023 and March 31, 2023, loans totaling $3.0 million and $3.2 million, respectively, were on nonaccrual status. Our policy is to reverse previously accrued but unpaid interest on nonaccrual loans; thereafter, interest income is recorded to the extent received when appropriate.

(1)Interest on loans includes net fees on loans that are not material in amount.

(2)For the purpose of calculating the average yield, the average balance of securities is presented at historical cost.

Note: As of December 31, 2022, loans totaling $2.8 million were on nonaccrual status. Our policy is to reverse previously accrued but unpaid interest on nonaccrual loans; thereafter, interest income is recorded to the extent received when appropriate.

(1)Interest on loans includes net fees on loans that are not material in amount.

(2)For the purpose of calculating the average yield, the average balance of securities is presented at historical cost.

Note: As of December 31, 2023 and 2022, loans totaling $3.9 million and $2.8 million, respectively, were on nonaccrual status. Our policy is to reverse previously accrued but unpaid interest on nonaccrual loans; thereafter, interest income is recorded to the extent received when appropriate.

The following tables set forth the reconciliation of return on average common equity to return on average tangible common equity, book value per share to tangible book value per share, net interest income to net interest income adjusted to a fully taxable-equivalent basis assuming a 21% marginal tax rate for interest earned on tax-exempt assets such as municipal loans and investment securities, along with the calculation of total revenue, adjusted noninterest expense, efficiency ratio (FTE), net interest margin (FTE) and net interest spread (FTE) for the applicable periods presented.

(1)These amounts are presented on a fully taxable-equivalent basis and are non-GAAP measures.

(2)These adjustments may include net gain or loss on sale of securities available for sale, net gain on sale of equity securities, BOLI income related to death benefits realized and other investment income or loss in the periods where applicable.

(3)These adjustments may include foreclosure expenses and branch closure expenses, in the periods where applicable.