ASB was advised in this transaction by Sandler O'Neill + Partners, L.P. as financial advisor and Hunton & Williams LLP as legal counsel. Keefe, Bruyette & Woods, Inc. was the financial advisor and Bracewell & Guiliani LLP was legal counsel to Prosperity.In addition to the information contained within this announcement, an Investor Presentation has been posted on Prosperity's website ( www.prosperitybanktx.com) containing additional information regarding this merger. Prosperity Bancshares, Inc.® Prosperity Bancshares Inc.®, recently named "America's Best Bank" by Forbes is a $9.8 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.prosperitybanktx.com, Retail Brokerage Services, MasterMoney Debit Cards, and 24 hour voice response banking. Prosperity currently operates one hundred seventy five (175) full service banking locations; fifty-nine (59) in the Houston area; twenty (20) in the South Texas area including Corpus Christi and Victoria; thirty-one (31) in the Dallas/Fort Worth area; twenty-one (21) in the East Texas area; thirty-four (34) in the Central Texas area including Austin and San Antonio; and ten (10) in the Bryan/College Station area. In connection with the proposed merger of American State Financial Corporation into Prosperity Bancshares, Prosperity Bancshares will file with the Securities and Exchange Commission a registration statement on Form S-4 to register the shares of Prosperity's common stock to be issued to the shareholders of American State Financial Corporation. The registration statement will include a proxy statement/prospectus which will be sent to the shareholders of American State Financial Corporation seeking their approval of the proposed transaction.