Mercantile Bank Corporation and Firstbank Corporation Shareholders Approve Merger

  Mercantile Bank Corporation and Firstbank Corporation Shareholders Approve
                                    Merger

Shareholders Overwhelmingly Support Merger of Equals

PR Newswire

GRAND RAPIDS and ALMA, Mich., Dec. 12, 2013

GRAND RAPIDSand ALMA, Mich., Dec. 12, 2013 /PRNewswire/ --Mercantile Bank
Corporation ("Mercantile") (NASDAQ: MBWM) and Firstbank Corporation
("Firstbank") (NASDAQ: FBMI) today announced the results of their respective
special meetings of shareholders held this morning.

The shareholders of both companies overwhelmingly voted to approve the
Agreement and Plan of Merger providing for the merger of Mercantile and
Firstbank. Over 99% of the Mercantile shares and 95% of the Firstbank shares
voted on the proposals to approve the Agreement and Plan of Merger were voted
in favor of the proposals. In addition, Mercantile shareholders approved the
issuance of shares of Mercantile common stock to Firstbank shareholders
pursuant to the Agreement and Plan of Merger.

"We are very pleased to announce that Mercantile's shareholders have endorsed
our proposed merger with Firstbank," said Michael Price, Chairman of the Board
and Chief Executive Officer of Mercantile. "This is a crucial milestone in
bringing our companies together. We continue to work toward satisfaction of
all closing conditions, and are working cooperatively with the Federal Reserve
Board as it conducts its review of the proposed combination. We remain
confident that closing will occur in the first quarter of 2014."

Thomas Sullivan, Chief Executive Officer of Firstbank, continued, "Our
shareholders today showed strong support for our collective efforts to combine
two great community banks to create Michigan's premier community banking
franchise. With integration planning well underway, we remain confident that
our combined company will offer great opportunity for our customers,
shareholders and employees."

About Mercantile Bank Corporation

Based in Grand Rapids, Michigan, Mercantile Bank Corporation is the bank
holding company for Mercantile Bank of Michigan. Founded in 1997 to provide
banking services to businesses, individuals and governmental units, the Bank
differentiates itself on the basis of service quality and the expertise of its
banking staff. Mercantile has seven full-service banking offices in Grand
Rapids, Holland and Lansing, Michigan.

About Firstbank Corporation

Firstbank Corporation, headquartered in Alma, Michigan, is a bank holding
company using a community bank local decision-making format with assets of
$1.5 billion and 46 banking offices serving Michigan's Lower Peninsula.

Important Information for Investors

Communications in this Current Report on Form 8-K do not constitute an offer
to sell or the solicitation of an offer to buy any securities or a
solicitation of any vote or approval. Mercantile and Firstbank have filed a
registration statement on Form S-4 (Registration No. 333-191212) that includes
a Joint Proxy Statement of Mercantile and Firstbank and also constitutes a
prospectus of Mercantile and Firstbank. The registration statement, as
amended, was declared effective by the SEC on November 6, 2013. Mercantile
and Firstbank mailed the definitive Joint Proxy Statement and Prospectus to
their respective shareholders in connection with the transaction on or about
November 7, 2013. Mercantile and Firstbank may also file other documents with
the SEC concerning the proposed merger. INVESTORS AND SECURITY HOLDERS OF
MERCANTILE AND FIRSTBANK ARE URGED TO READ THE JOINT PROXY STATEMENT AND
PROSPECTUS REGARDING THE PROPOSED MERGER AND OTHER RELEVANT DOCUMENTS THAT
HAVE FILED OR TO BE FILED WITH THE SEC CAREFULLY AND IN THEIR ENTIRETY BECAUSE
THEY CONTAIN IMPORTANT INFORMATION ABOUT MERCANTILE, FIRSTBANK, THE MERGER AND
RELATED MATTERS. Investors and security holders may obtain a free copy of the
joint proxy statement and prospectus and other documents containing important
information about Mercantile and Firstbank through the website maintained by
the SEC at www.sec.gov. Copies of the documents filed with the SEC by
Mercantile will be available free of charge on Mercantile's website at
www.mercbank.com on the "Investor Relations" page. Copies of the documents
filed with the SEC by Firstbank will be available free of charge on
Firstbank's website at www.firstbankmi.com.

Forward-Looking Statements

This press release contains comments or information that constitute
forward-looking statements (within the meaning of the Private Securities
Litigation Reform Act of 1995) that are based on current expectations that
involve a number of risks and uncertainties. These forward looking statements
are subject to a number of factors and uncertainties which could cause
Mercantile, Firstbank, or the combined company's actual results and experience
to differ from the anticipated results and expectations expressed in such
forward looking statements. Forward looking statements speak only as of the
date they are made and neither Mercantile nor Firstbank assumes any duty to
update forward looking statements. These forward-looking statements include,
but are not limited to, statements about (i) the expected benefits of the
transaction between Mercantile and Firstbank, including future financial and
operating results, accretion and earn-back, cost savings, enhanced revenues,
long term growth, and the expected market position of the combined company
that may be realized from the transaction, and (ii) Mercantile and Firstbank's
plans, objectives, expectations and intentions and other statements contained
in this press release that are not historical facts. Other statements
identified by words such as "opportunity," "potential," and "will," statements
that Mercantile and Firstbank are "confident" that certain results will occur,
or words of similar meaning, generally are intended to identify
forward-looking statements. These statements are based upon the current
beliefs and expectations of Mercantile's and Firstbank's management and are
inherently subject to significant business, economic and competitive risks and
uncertainties, many of which are beyond their respective control. In addition,
these forward-looking statements are subject to assumptions with respect to
future business strategies and decisions that are subject to change. Actual
results may differ materially from those indicated or implied in the
forward-looking statements. Although Mercantile and Firstbank have signed an
agreement, there is no assurance that they will complete the proposed merger.
The merger agreement will terminate if the companies do not receive the
necessary government approvals, or if any conditions to closing are not
satisfied. Additional information concerning risks is contained in
Mercantile's and Firstbank's most recently filed Annual Reports on Form 10-K,
subsequent Quarterly Reports on Form 10-Q, recent Current Reports on Form 8-K
and other SEC filings.

SOURCE Mercantile Bank Corporation; Firstbank Corporation

Website: http://www.mercbank.com
Contact: MEDIA: Amanda Passage, Lambert, Edwards & Associates, 616-233-0500,
apassage@lambert-edwards.com; INVESTORS:Chuck Christmas, Mercantile Bank
Corporation, 616-726-1202, cchristmas@mercbank.com, or Bob Burton, Lambert,
Edwards & Associates, 678-576-2991, rburton@lambert-edwards.com, or Samuel
Stone, Firstbank Corporation, 989-466-7325, sstone@firstbankmi.com
 
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