Guaranty Bancorp Announces Executive Appointment

DENVER, CO--(Marketwire - Jul 29, 2011) - Guaranty Bancorp (NASDAQ: GBNK) today announced that Christopher G. Treece been promoted to the position of Executive Vice President, Chief Financial Officer and Secretary for the Company and its wholly-owned bank subsidiary, Guaranty Bank and Trust Company, a Colorado community bank since 1955.

Mr. Treece previously served as the Company's and Bank's Senior Vice President and Corporate Controller since April 2007. Mr. Treece has also served as a director of the Bank since May 2009.

Mr. Treece has 20 years of experience in banking and public accounting. Prior to joining the Company, Mr. Treece worked at UMB Financial Corporation in Kansas City, Missouri, a multi-bank holding company with $13 billion in assets, serving as Senior Vice President, Controller, Tax Director and Chief Accounting Officer. In this position, he managed the Corporate Finance, Tax, Purchasing, Accounts Payable and Payroll departments and was responsible for internal controls over financial reporting. Prior to joining UMB, Mr. Treece worked for seven years at RSM McGladrey within the financial services group, working with over one-hundred community banks throughout Colorado, Oklahoma, Kansas and Missouri. Mr. Treece began his career at KPMG in Kansas City, where he worked primarily with community banks as well as other financial institutions and several insurance companies.

Mr. Treece earned a bachelor's degree in Accounting and a Masters of Accountancy from Truman State University in Kirksville, Missouri.

About Guaranty Bancorp

Guaranty Bancorp is a bank holding company that operates 34 branches in Colorado through a single bank, Guaranty Bank and Trust Company. The bank provides banking and other financial services including real estate, construction, commercial and industrial, energy, consumer and agricultural loans throughout its targeted Colorado markets to consumers and small to medium-sized businesses, including the owners and employees of those businesses. The bank also provides trust services, including personal trust administration, estate settlement, investment management accounts and self-directed IRAs. More information about Guaranty Bancorp can be found at www.gbnk.com.

Forward-Looking Statements

This press release contains forward-looking statements, which are included in accordance with the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995. In some cases, you can identify forward-looking statements by terminology such as "may," "will," "should," "could," "expects," "plans," "intends," "anticipates," "believes," "estimates," "predicts," "potential," or "continue," or the negative of such terms and other comparable terminology. These forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause the Company's actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by such forward-looking statements. Such factors include, among others, the following: failure to maintain adequate levels of capital and liquidity to support Company's operations; the effect of the regulatory written agreement the Company and its bank subsidiary have entered into and potential future supervisory action against the Company or its bank subsidiary; general economic and business conditions in those areas in which the Company operates; demographic changes; competition; fluctuations in interest rates; continued ability to attract and employ qualified personnel; ability to receive regulatory approval for our bank subsidiary to declare dividends to the Company; adequacy of our allowance for loan losses, changes in credit quality and the effect of credit quality on our provision for credit losses and allowance for loan losses; changes in governmental legislation or regulation, including, but not limited to, any increase in FDIC insurance premiums; changes in accounting policies and practices; changes in the deferred tax asset valuation allowance; changes in business strategy or development plans; changes in the securities markets; changes in consumer spending, borrowing and savings habits; the availability of capital from private or government sources; competition for loans and deposits and failure to attract or retain loans and deposits; changes in the financial performance and/or condition of our borrowers and the ability of our borrowers to perform under the terms of their loans and other terms of credit agreements; political instability, acts of war or terrorism and natural disasters; and additional "Risk Factors" referenced in the Company's most recent Annual Report on Form 10-K filed with the Securities and Exchange Commission, as supplemented from time to time. When relying on forward-looking statements to make decisions with respect to the Company, investors and others are cautioned to consider these and other risks and uncertainties. The Company can give no assurance that any goal or plan or expectation set forth in forward-looking statements can be achieved and readers are cautioned not to place undue reliance on such statements, which speak only as of the date made. The forward-looking statements are made as of the date of this press release, and the Company does not intend, and assumes no obligation, to update the forward-looking statements or to update the reasons why actual results could differ from those projected in the forward-looking statements.