Exhibit 99.1

Filed by Pacific Premier Bancorp, Inc.

Pursuant to Rule 425 under the Securities Act of 1933

Subject Company: Plaza Bancorp

SEC Registration Statement No.: 333-220437

Pacific Premier Bancorp Recognized on

Fortune’s 100 Fastest Growing Companies List

Irvine, Calif., October 3, 2017 -- Pacific Premier Bancorp, Inc. (NASDAQ: PPBI), the holding company of Pacific Premier Bank, announced today that it placed 21^st on the list of Fortune’s 100 Fastest Growing Companies for 2017.

The Fortune list ranks publicly traded companies according to a formula that takes into account revenue growth rate, earnings per share growth rate, and the three-year annualized total return for the period ended June 30, 2017.

“Being named on the list of Fortune’s fastest growing companies is a testament to the high performing culture we have built at Pacific Premier and our talented, hard-working colleagues that deliver superior results for both our customers and our shareholders,” said Steven R. Gardner, Chairman, President and Chief Executive Officer of Pacific Premier Bancorp. “We look forward to continuing to generate profitable growth and creating additional value for our shareholders in the future.”

About Pacific Premier Bancorp, Inc.

Pacific Premier Bancorp, Inc. is the holding company for Pacific Premier Bank, one of the largest banks headquartered in Southern California with approximately $6.4 billion in assets. Pacific Premier Bank is a business bank primarily focused on serving small and middle market businesses in the counties of Orange, Los Angeles, Riverside, San Bernardino, San Diego, San Luis Obispo and Santa Barbara, California. Through its 26 depository branches, Pacific Premier Bank offers a diverse range of lending products including commercial, commercial real estate, construction, and SBA loans, as well as specialty banking products for homeowners associations and franchise lending nationwide.

Notice to Plaza Bancorp Stockholders

This press release does not constitute an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote or approval. In connection with PPBI’s proposed acquisition of Plaza Bancorp (“Plaza”), PPBI has filed a registration statement on Form S-4 (the “Registration Statement”) with the U.S. Securities and Exchange Commission (the “SEC”).  The Registration Statement was declared by the SEC to be effective on September 28, 2017, and a prospectus/consent solicitation statement was distributed to the stockholders of Plaza. STOCKHOLDERS OF PLAZA ARE ENCOURAGED TO READ THE REGISTRATION STATEMENT AND THE PROSPECTUS/CONSENT SOLICITATION STATEMENT AND ANY OTHER RELEVANT DOCUMENTS FILED WITH THE SEC, AS WELL AS SUPPLEMENTS TO THOSE DOCUMENTS, BECAUSE THEY CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED ACQUISITION. Investors and security holders are be able to obtain the documents, including the prospectus/consent solicitation statement, free of charge at the SEC’s website, www.sec.gov. In addition, documents filed with the SEC by PPBI are available free of charge by (1) accessing PPBI’s website at www.ppbi.com under the “Investor Relations” link and then under the heading “SEC Filings,” (2) writing to Pacific Premier at 17901 Von Karman Avenue, Suite 1200, Irvine, CA 92614, Attention: Investor Relations or (3) writing Plaza at 18200 Von Karman Avenue Suite 500, Irvine, CA 92612, Attention: Corporate Secretary.

The directors, executive officers and certain other members of management and employees of Plaza may be deemed to be participants in the solicitation of consents in favor of the acquisition from the stockholders of Plaza. Additional information regarding the interests of those participants and other

persons who may be deemed participants in the transaction may be obtained by reading the prospectus/consent solicitation statement regarding the proposed acquisition. Free copies of this document may be obtained as described in the preceding paragraph.

Forward-Looking Comments

The statements contained herein that are not historical facts are forward-looking statements based on management's current expectations and beliefs concerning future developments and their potential effects on PPBI. Such statements involve inherent risks and uncertainties, many of which are difficult to predict and are generally beyond the control of PPBI. There can be no assurance that future developments affecting PPBI will be the same as those anticipated by management. PPBI cautions readers that a number of important factors could cause actual results to differ materially from those expressed in, or implied or projected by, such forward-looking statements. These risks and uncertainties include, but are not limited to, the following: the strength of the United States economy in general and the strength of the local economies in which we conduct operations; the effects of, and changes in, trade, monetary and fiscal policies and laws, including interest rate policies of the Board of Governors of the Federal Reserve System; inflation, interest rate, market and monetary fluctuations; the timely development of competitive new products and services and the acceptance of these products and services by new and existing customers; the willingness of users to substitute competitors’ products and services for PPBI’s products and services; the impact of changes in financial services policies, laws and regulations (including the Dodd-Frank Wall Street Reform and Consumer Protection Act) and of governmental efforts to restructure the U.S. financial regulatory system; technological changes; the effect of acquisitions that PPBI may make, if any, including, without limitation, the failure to achieve the expected revenue growth and/or expense savings from its acquisitions; changes in the level of PPBI’s nonperforming assets and charge-offs; any oversupply of inventory and deterioration in values of California real estate, both residential and commercial; the effect of changes in accounting policies and practices, as may be adopted from time-to-time by bank regulatory agencies, the Securities and Exchange Commission (“SEC”), the Public Company Accounting Oversight Board, the Financial Accounting Standards Board or other accounting standards setters; possible other-than-temporary impairment of securities held by us; changes in consumer spending, borrowing and savings habits; the effects of PPBI’s lack of a diversified loan portfolio, including the risks of geographic and industry concentrations; ability to attract deposits and other sources of liquidity; changes in the financial performance and/or condition of our borrowers; changes in the competitive environment among financial and bank holding companies and other financial service providers; unanticipated regulatory or judicial proceedings; and PPBI’s ability to manage the risks involved in the foregoing. Additional factors that could cause actual results to differ materially from those expressed in the forward-looking statements are discussed in the 2016 Annual Report on Form 10-K of Pacific Premier Bancorp, Inc. filed with the SEC and available at the SEC’s Internet site (http://www.sec.gov).

PPBI specifically disclaims any obligation to update any factors or to publicly announce the result of revisions to any of the forward-looking statements included herein to reflect future events or developments.

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Contact:

Pacific Premier Bancorp, Inc.

Steven R. Gardner

Chairman, President and CEO

949-864-8000

Ronald J. Nicolas, Jr.

Senior Executive Vice President & CFO

949-864-8000