Prosperity Bancshares, Inc.® Completes Merger With Coppermark Bancshares, Inc.

Prosperity Bancshares, Inc.® Completes Merger With Coppermark Bancshares, Inc.

PR Newswire

HOUSTON, April 1, 2013

HOUSTON, April 1, 2013 /PRNewswire/ -- Prosperity Bancshares, Inc.^®
("Prosperity") (NYSE: PB), the parent company of Prosperity Bank^®, announced
the completion of the merger with Coppermark Bancshares, Inc. ("Coppermark")
and its wholly owned subsidiary Coppermark Bank, headquartered in Oklahoma
City, Oklahoma, whereby Coppermark was merged with and into Prosperity and
Coppermark Bank was merged with and into Prosperity Bank, effective on April
1, 2013.

Coppermark Bank operates nine (9) full-service banking offices: six (6) in
Oklahoma City, Oklahoma and surrounding areas and three (3) in the Dallas,
Texas area. As of December 31, 2012, Coppermark reported, on a consolidated
basis, total assets of $1.3 billion, total loans of $853.4 million and total
deposits of $1.2 billion.

Under the terms of the definitive agreement, Prosperity issued approximately
3,258,845 shares of Prosperity common stock plus $60.0 million in cash for all
outstanding shares of Coppermark capital stock.

Russell E. Swarts, Chairman of Coppermark will serve the combined entity as
Senior Chairman – Central Oklahoma Region. Thomas Legan, Coppermark's
President, will become Chairman – Central Oklahoma Region and will be
responsible for the day-to-day operations and management of all Oklahoma
locations. Jacque Fiegel, Coppermark's Chief Operating Officer, will become
President – Central Oklahoma Region and will be responsible for retail and
business banking functions of all Oklahoma locations and certain operational
matters for the combined entity. Jeff Russell, Coppermark's President of the
Oklahoma Market and Chief Credit Officer, will also be President – Central
Oklahoma Region and will be responsible for lending in Oklahoma.

David Zalman, Chairman and Chief Executive Officer of Prosperity, commented,
"I would like to welcome all the customers, associates, directors and
shareholders to our combined company. It is very exciting to team up with
such a dedicated team of professionals. Coppermark is noted for the personal
service it provides to its customers as well as the loyalty and dedication of
the associates to the company. It is our combined goal to continue the
culture that Coppermark has been so successful at nurturing."

"We have worked for 50 years to build a strong bank with a reputation for
integrity and exceptional customer service," said Russell Swarts, Chairman of
Coppermark. "We are excited about the opportunities for our customers,
employees and shareholders to join a strong and community-driven bank like
Prosperity with a dynamic presence in Texas and now Oklahoma."

"Prosperity and Coppermark both have a long and consistent record of success,
and this merger provides our customers with significantly expanded banking
opportunities while maintaining our high level of personal service," said
Thomas Legan, President and Chief Executive Officer of Coppermark.

Coppermark was advised in this transaction by Commerce Street Capital, LLC as
financial advisor and Fenimore, Kay, Harrison & Ford, LLP and Cheek & Falcone,
PLLC as legal counsel. Bracewell & Giuliani LLP was legal counsel to
Prosperity.

Prosperity Bancshares, Inc.^®

Prosperity Bancshares Inc.^® is a $14.6 billion Houston, Texas based regional
financial holding company, formed in 1983. Operating under a community banking
philosophy and seeking to develop broad customer relationships based on
service and convenience, Prosperity offers a variety of traditional loan and
deposit products to its customers, which consist primarily of small and medium
sized businesses and consumers. In addition to established banking products,
Prosperity offers a complete line of services including: Internet Banking
services at http://www.prosperitybankusa.com, Retail Brokerage Services,
MasterMoney Debit Cards, 24 hour voice response banking, Trust and Wealth
Management and Mobile Banking. Since completing the merger with Coppermark,
Prosperity now operates two hundred and twenty-four (224) full service banking
locations; fifty-nine (59) in the Houston area; twenty (20) in the South Texas
area including Corpus Christi and Victoria; thirty-eight (38) in the
Dallas/Fort Worth area; twenty-three (23) in the East Texas area; thirty-four
(34) in the Central Texas area including Austin and San Antonio; thirty-four
(34) in the West Texas area including Lubbock, Midland/Odessa and Abilene; ten
(10) in the Bryan/College Station area; and six (6) in the Central Oklahoma
area.

"Safe Harbor" Statement under the Private Securities Litigation Reform Act of
1995: This release contains forward-looking statements within the meaning of
the securities laws that are based on current expectations, assumptions,
estimates and projections about Prosperity and its subsidiaries. These
forward-looking statements are not guarantees of future performance and are
subject to risks and uncertainties, many of which are outside of Prosperity's
control, that may cause actual results to differ materially from those
expressed or implied by the forward-looking statements. These risks and
uncertainties include but are not limited to whether Prosperity can:
successfully identify acquisition targets and integrate the businesses of
acquired companies and banks; continue to sustain its current internal growth
rate or total growth rate; provide products and services that appeal to its
customers; continue to have access to debt and equity capital markets; and
achieve its sales objectives. Other risks include, but are not limited to:
the possibility that credit quality could deteriorate; actions of competitors;
changes in laws and regulations (including changes in governmental
interpretations of regulations and changes in accounting standards); a
deterioration or downgrade in the credit quality and credit agency ratings of
the securities in Prosperity's securities portfolio; customer and consumer
demand, including customer and consumer response to marketing; effectiveness
of spending, investments or programs; fluctuations in the cost and
availability of supply chain resources; economic conditions, including
currency rate fluctuations and interest rate fluctuations and weather. These
and various other factors are discussed in Prosperity's Annual Report on Form
10-K for the year ended December 31, 2012 and other reports and statements
Prosperity has filed with the SEC. Copies of the SEC filings for Prosperity
Bancshares^® may be downloaded from the Internet at no charge from
www.prosperitybankusa.com.

SOURCE Prosperity Bancshares, Inc.

Website: http://www.prosperitybankusa.com
Contact: Prosperity Bancshares, Inc.® David Zalman, Chairman and Chief
Executive Officer, +1-281-269-7199, david.zalman@prosperitybankusa.com