Midsouth Bancorp (MSL) 8-K Other Events

Exhibit 99.1

Jefferson Branch Acquisition

July 29, 2011

Transaction Summary

Description:Purchase of five Jefferson Bank branches in the Dallas Ft. Worth MSA

Seller:First Bank & Trust Co. (Following their acquisition of Jefferson Bank via
Section 363 sale through Jefferson Bank’s parent bankruptcy filing)

Purchase Price:$10.5 million
($7.5 M Deposit Premium + $3.6 M Fixed Assets - $0.6 M Loan Discount)

Assets Purchased:$70 million performing loans - credit diligence on over 80% of portfolio

DepositsPurchased:$164 million

Deposit Premium:4.6%

Loan Discount:1%

Transaction Expenses:$880,000 pretax (50% professional fees, 50% deconversion costs)
($98,000 Q1A; $115,000 Q2A, $627,000 Q3E ($0.04 per sh), $40,000 Q4E)

Cost Savings:Approx. 35% cost reductions vs. Jefferson stand alone level - from
reductions in credit costs and corporate overhead

Earnings Accretion:2011E - breakeven after transaction expenses
2012E - $0.11

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Strategic Rationale

ØThe Dallas/Ft. Worth Metroplex is one of the most attractive markets in the
country with a strong regional economy, attractive demographics and
significant growth opportunities

ØApproximately 29% of deposits will be in Texas, more than double prior
levels

ØApproximately 32% of loans will be in Texas, up 50% from prior levels

ØLegal Lending Limit will increase more than 6X prior levels at Jefferson
expanding potential for loan growth

ØAllows for diversification of customer base from oil services industry other
attractive industries such as healthcare, technology and education

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Pro Forma Impact

MidSouth

Bancorp,

Inc.

Jefferson

Bank

MidSouth

Bancorp, Inc.

Pro Forma With

Jefferson Bank

Loans

$580,099

$69,518

$650,099

Deposits

$825,896

$164,321

$990,217

Assets

$1,049,105

$164,321

$1,213,426

Branches

34

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39

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Demographic Profile

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