Exhibit 99.1

Synovus Announces Earnings for the Second Quarter of 2015

Diluted Earnings per Share increased 25.5% as compared to 2Q14

COLUMBUS, Ga., July 21, 2015 – Synovus Financial Corp. (NYSE: SNV) today reported financial results for the quarter ended June 30, 2015.

Second Quarter Highlights

“We are pleased to report solid second quarter results as evidenced by strong loan and core deposit growth as well as increased fee income driven by strong mortgage production,” said Kessel D. Stelling, chairman and CEO. “During the quarter, we were also proud to be recognized as one of America’s Most Reputable Banks by American Banker magazine and the Reputation Institute, and were among only three companies ranked in the top 10 by both customers and non-customers. This recognition, along with our steadily improving financial performance, validates that our focus on relationship banking — defined by local leadership, personal service, and a deep commitment to strengthening our communities — differentiates Synovus and clearly resonates with customers and prospects.”

Balance Sheet

Core Performance

Adjusted pre-tax, pre-credit costs income was $103.6 million for the second quarter 2015, an increase of $2.6 million or 2.6% from $101.0 million for the previous quarter and an increase of $4.7 million or 4.7% as compared to the second quarter 2014.

Credit Quality

Broad-based improvement in credit quality continued.

Capital Ratios

Capital ratios remained strong and include the impact of common stock repurchases completed through June 30, 2015.

Second Quarter Earnings Conference Call

Synovus will host an earnings highlights conference call at 8:30 a.m. EDT on July 21, 2015. 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 www.synovus.com/webcasts. The replay will be archived for 12 months and will be available 30-45 minutes after the call.

About Synovus

Synovus Financial Corp. is a financial services company based in Columbus, Georgia with approximately $28 billion in assets. Synovus provides commercial and retail banking, investment, and mortgage services to customers through 28 locally-branded divisions, 258 branches, and 341 ATMs in Georgia, Alabama, South Carolina, Florida, and Tennessee. Synovus Bank, a wholly owned subsidiary of Synovus, was named one of America’s Most Reputable Banks by American Banker and the Reputation Institute in 2015. See Synovus on the web at synovus.com.

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 on credit trends and key credit metrics; expectations regarding deposits, loan growth and the net interest margin; expectations on our growth strategy, expense initiatives, and future profitability, 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, 2014 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.

Use of Non-GAAP Financial Measures

The measures entitled average core deposits; average core deposits excluding average state, county, and municipal deposits; tangible common equity to tangible assets ratio; adjusted net income per diluted common share; adjusted pre-tax, pre-credit costs income; adjusted non-interest income; and adjusted non-interest expense are not measures recognized under U.S. generally accepted accounting principles (GAAP) and therefore are considered non-GAAP financial measures. The most comparable GAAP measures are total average deposits; total shareholders’ equity to total assets ratio; net income per diluted common share; income before income taxes; total non-interest income; and total non-interest expense, respectively.

Synovus believes that these non-GAAP financial measures provide meaningful additional information about Synovus to assist management and investors in evaluating Synovus’ capital strength and the performance of its core business. These non-GAAP financial measures should not be considered as substitutes for total average deposits; total shareholders’ equity to total assets ratio; net income per diluted common share; income before income taxes; total non-interest income; and total non-interest expense determined in accordance with GAAP and may not be comparable to other similarly titled measures at other companies.

The computations of average core deposits; average core deposits excluding average state, county, and municipal deposits; tangible common equity to tangible assets ratio; adjusted net income per diluted common share; adjusted pre-tax, pre-credit costs income; adjusted non-interest income; and adjusted non-interest expense; and the reconciliation of these measures to total average deposits; total shareholders’ equity to total assets ratio; net income per diluted common share; income before income taxes; total non-interest income; and total non-interest expense are set forth in the tables below.

  ⁽¹⁾ Amounts for other periods presented herein are not reported separately as amounts are not material.

  ⁽²⁾ Other credit costs consist primarily of foreclosed real estate expense, net.