Summary of CITIZENS BANKING CORP

Item 8.01. Other Events.
(a) See press release attached as Exhibit 99.1 hereto.
(b) Cautionary Factors. Safe Harbor Statement
Discussions in the attached press release and information provided pursuant to Item 2.02 that are not statements of historical fact (including statements that include terms such as "will," "may," "should," "believe," "expect," "anticipate," "estimate," "intend," and "plan") are forward-looking statements that involve risks and uncertainties, and Citizens' actual future results could materially differ from those discussed. Factors that could cause or contribute to such differences include, without limitation, adverse changes in Citizens' loan and lease portfolios resulting in credit risk-related losses and expenses (including losses due to fraud, Michigan automobile-related industry changes and shortfalls, and other economic factors) as well as additional increases in the allowance for loan losses; fluctuations in market interest rates, the effects on net interest income of changes in Citizens' interest rate risk position and the potential inability to hedge interest rate risks economically; adverse changes in economic or financial market conditions and the economic effects of terrorist attacks and potential attacks; Citizens' potential inability to continue to attract core deposits; Citizens' potential inability to continue to obtain third party financing on favorable terms; adverse changes in competition, pricing environments or relationships with major customers; unanticipated expenses and payments relating to litigation brought against Citizens from time to time; Citizens' potential inability to adequately invest in and implement products and services in response to technological changes; adverse changes in applicable laws and regulatory requirements; the potential lack of market acceptance of Citizens' products and services; changes in accounting and tax rules and interpretations that negatively impact results of operations or financial position; the potential inadequacy of Citizens' business continuity plans or data security systems; the potential failure of Citizens' external vendors to fulfill their contractual obligations to Citizens; Citizens' potential inability to integrate acquired operations; unanticipated environmental liabilities or costs; impairment of the ability of the banking subsidiaries to pay dividends to the holding company parent; the potential circumvention of Citizens' controls and procedures; Citizens' success in managing the risks involved in the foregoing; and other risks and uncertainties detailed from time to time in its filings with the Securities and Exchange Commission ("SEC"). Other factors not currently anticipated may also materially and adversely affect Citizens' results of operations. There can be no assurance that future results will meet expectations. While Citizens believes that the forward-looking statements in this release are reasonable, you should not place undue reliance on any forward-looking statement. In addition, these statements speak only as of the date made. Citizens does not undertake, and expressly disclaims any obligation to update or alter any statements, whether as a result of new information, future events or otherwise, except as required by applicable law.
Additional Information
In connection with the proposed merger, Citizens and Republic Bancorp Inc. ("Republic") will file a joint proxy statement/prospectus with the SEC. Investors and security holders are advised to read the joint proxy statement/prospectus when it becomes available because it will contain important information. Investors and security holders may obtain a free copy of the joint proxy statement/prospectus (when available) and other documents filed by Citizens and Republic with the SEC at the SEC's website at http://www.sec.gov. Free copies of the joint proxy statement/prospectus (when available) and each company's other filings with the SEC may also be obtained by accessing Citizens' website at http://www.citizensonline.com under the Investor Relations section or by accessing Republic's website at http://www.republicbancorp.com under the Investor Relations section.
Citizens and Republic and their respective directors, executive officers and other members of their management may be soliciting proxies from their respective shareholders in favor of the merger. Information concerning persons who may be considered participants in the solicitation of Citizens' shareholders under the rules of the SEC is set forth in the Proxy Statement filed by Citizens with the SEC on March 22, 2006, and information concerning persons who may be considered participants in the solicitation of Republic's shareholders under the rules of the SEC is set forth in the Proxy Statement filed by Republic with the SEC on March 14, 2006. 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 joint proxy statement/prospectus regarding the proposed merger when it becomes available. You may obtain free copies of these documents as described above.
This communication shall not constitute an offer to sell or the solicitation of an offer to buy securities, nor shall there be any sale of securities in any jurisdiction in which such solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of such jurisdiction. Item 9.01. Financial Statements and Exhibits
(c) Exhibits.
Exhibit 99.1 Press Release, dated July 20, 2006.

Table of Contents