Trustmark Announces Acquisition of RB Bancorporation (Reliance Bank) Athens, AL November 14, 2016 Building a Premier Regional Financial Services Organization Exhibit 99.1

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Transaction Rationale – Acquisition of Reliance Bancorporation Expansion into Huntsville, Alabama MSA Entry into high-growth, contiguous market Expand Trustmark’s franchise into one of the fastest growing metro areas in Alabama and one of the most attractive metro areas in the Southeast Opportunity to generate additional revenue and leverage Trustmark’s platform to deliver full suite of banking, mortgage banking, wealth management and insurance services Attractive financial profile Approximately $25.6 million deal value ($22.00 per share / 100% cash) Price / TBV of 1.62x(1) and Price / LTM Earnings of 19.1x(1) EPS accretive with minimal dilution to TBV Low risk execution Tuck-in acquisition in a contiguous market Comprehensive due diligence completed (85% of gross loans reviewed) Cultural fit with senior bankers with proven 20+ year in-market track record Employment agreements in place with Senior Management Expected to close in first half of 2017 Q3-16 Financial Highlights Loan Composition Deposit Composition Source: Company reports Note: Consolidated financial data and pricing metrics as of Q3-16 (1) Inclusive of cash value of options and warrants (2) Excludes one-time transaction charges and assumes no revenue synergies Assets $210 MM Adj. LTM Net Income(3) $1.3 MM TCE / TA 7.63% Loans: $129 MM Deposits: $176 MM (3) Excludes one-time merger charges related to Reliance Bank’s purchase and assumption of four branches and one LPO that closed in Q2-16 Other 5% CRE 38% C&I 12% C&D 22% 1-4 Family 23% Jumbo Time 3% Noninterest Bearing 26% Interest-Bearing DDAs 30% MMDAs & Savings 18% Retail Time 23%

U.S. Army / Redstone Arsenal NASA / Marshall Space Flight Center Huntsville Hospital Huntsville City Schools The Boeing Company Madison County Schools Science Applications International Corporation Market Overview – Huntsville, AL MSA An attractive, growing contiguous market with a diversified economy Source: SNL Financial Top Employers – Huntsville, AL MSA Branch Map Select Alabama MSA Demographic Data Trustmark RB Bancorp. (7 locations) Camber Corporation University of Alabama - Huntsville Alabama A&M University ADTRAN, Inc. Northrop Grumman Corporation Verizon Wireless Toyota Motor Manufacturing Alabama, Inc. Lockheed Martin Corporation