Exhibit 99.1

Synovus Announces Earnings for the First Quarter 2018

Diluted Earnings per Share of $0.84, up 49.7% vs. $0.56 in 1Q17

COLUMBUS, Ga., April 24, 2018 – Synovus Financial Corp. (NYSE: SNV) today reported financial results for the quarter ended March 31, 2018.

First Quarter Highlights

“2018 is off to a good start, with 12 percent growth in revenues and a 50 percent increase in earnings per share year-over-year,” said Kessel D. Stelling, Synovus chairman and CEO. “We delivered another quarter of strong operating leverage through disciplined execution of our growth strategies, including talent acquisition and expansion of our presence in high-potential markets. As we approach completion of the transition to a unified Synovus brand, we are already seeing the benefits of greater name recognition across our footprint. Our team is deeply committed to building on our reputation, improving the customer experience, and executing on core growth strategies to meet and exceed long-term targets.”

Balance Sheet

Core Performance

Credit Quality

Capital

First Quarter Earnings Conference Call

Synovus will host an earnings highlights conference call at 8:30 a.m. EDT on April 24, 2018. The earnings call will be accompanied by a slide presentation. Shareholders and other interested parties may listen to this conference call via simultaneous Internet broadcast. For a link to the webcast, go to investor.synovus.com/event. The replay will be archived for 12 months and will be available 30-45 minutes after the call.

Synovus Financial Corp. is a financial services company based in Columbus, Georgia, with more than $31 billion in assets. Synovus provides commercial and retail banking, investment, and mortgage services through 250 branches in Georgia, Alabama, South Carolina, Florida, and Tennessee. Synovus Bank, a wholly owned subsidiary of Synovus, was recognized as the “Most Reputable Bank” by American Banker and the Reputation Institute in 2017. Synovus is on the web at synovus.com, and on Twitter, Facebook, LinkedIn, and Instagram.

Forward-Looking Statements

This press release and certain of our other filings with the Securities and Exchange Commission contain statements that constitute “forward-looking statements” within the meaning of, and subject to the protections of, Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. All statements other than statements of historical fact are forward-looking statements. You can identify these forward-looking statements through Synovus’ use of words such as “believes,” “anticipates,” “expects,” “may,” “will,” “assumes,” “should,” “predicts,” “could,” “would,” “intends,” “targets,” “estimates,” “projects,” “plans,” “potential” and other similar words and expressions of the future or otherwise regarding the outlook for Synovus’ future business and financial performance and/or the performance of the banking industry and economy in general. These forward-looking statements include, among others, our expectations regarding deposits, loan growth and the net interest margin; expectations on our growth strategy, expense initiatives, capital management and

future profitability; expectations on credit trends and key credit metrics; and the assumptions underlying our expectations. Prospective investors are cautioned that any such forward-looking statements are not guarantees of future performance and involve known and unknown risks and uncertainties which may cause the actual results, performance or achievements of Synovus to be materially different from the future results, performance or achievements expressed or implied by such forward-looking statements. Forward-looking statements are based on the information known to, and current beliefs and expectations of, Synovus’ management and are subject to significant risks and uncertainties. Actual results may differ materially from those contemplated by such forward-looking statements. A number of factors could cause actual results to differ materially from those contemplated by the forward-looking statements in this press release. Many of these factors are beyond Synovus’ ability to control or predict.

These forward-looking statements are based upon information presently known to Synovus’ management and are inherently subjective, uncertain and subject to change due to any number of risks and uncertainties, including, without limitation, the risks and other factors set forth in Synovus’ filings with the Securities and Exchange Commission, including its Annual Report on Form 10-K for the year ended December 31, 2017, under the captions “Cautionary Notice Regarding Forward-Looking Statements” and “Risk Factors” and in Synovus’ quarterly reports on Form 10-Q and current reports on Form 8-K. We believe these forward-looking statements are reasonable; however, undue reliance should not be placed on any forward-looking statements, which are based on current expectations and speak only as of the date that they are made. We do not assume any obligation to update any forward-looking statements as a result of new information, future developments or otherwise, except as otherwise may be required by law.

Non-GAAP Financial Measures

The measures entitled adjusted non-interest income; adjusted non-interest expense; adjusted efficiency ratio; adjusted earnings per diluted share; adjusted return on average assets; adjusted return on average common equity; adjusted return on average tangible common equity; average non-time core deposits; tangible common equity ratio; and common equity Tier 1 (CET1) ratio (fully phased-in); are not measures recognized under GAAP and therefore are considered non-GAAP financial measures. The most comparable GAAP measures to these measures are total non-interest income; total non-interest expense; efficiency ratio; earnings per diluted common share; return on average assets; return on average common equity; total average deposits; the ratio of total shareholders’ equity to total assets; and the CET1 ratio; respectively.

Management believes that these non-GAAP financial measures provide meaningful additional information about Synovus to assist management and investors in evaluating Synovus’ operating results, financial strength, the performance of its business, and the strength of its capital position. However, these non-GAAP financial measures have inherent limitations as analytical tools and should not be considered in isolation or as a substitute for analyses of operating results or capital position as reported under GAAP. The non-GAAP financial measures should be considered as additional views of the way our financial measures are affected by significant items and other factors, and since they are not required to be uniformly applied, they may not be comparable to other similarly titled measures at other companies. Adjusted non-interest income is a measure used by management to evaluate total revenue and non-interest income exclusive of net investment securities gains/losses and changes in fair value of private equity investments, net. Adjusted non-interest expense and the adjusted efficiency ratio are measures utilized by management to measure the success of expense management initiatives focused on reducing recurring controllable operating costs. Adjusted earnings per diluted share, adjusted return on average assets, and adjusted return on average common equity are measurements used by management to evaluate operating results exclusive of items that are not indicative of ongoing operations and impact period-to-period comparisons. Average non-time core deposits is a measure used by management to evaluate organic growth of deposits and the quality of deposits as a funding source. The adjusted return on average tangible common equity is a measure used by management to compare Synovus’ performance with other financial institutions because it calculates the return available to common shareholders without the impact of intangible assets and their related amortization, thereby allowing management to evaluate the performance of the business consistently. The tangible common equity ratio and common equity Tier 1 (CET1) ratio (fully phased-in) are used by management and bank regulators to assess the strength of our capital position. The computations of these measures are set forth in the tables below.

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