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Note 2 - Business Combination (Details) - Purchase Price - Firstbank Corporation [Member]	Jun. 01, 2014 USD ($) $ / shares shares
Purchase Price:
Mercantile common shares issued for Firstbank common shares (in Shares) | shares	8,087,272
Price per share, based on Mercantile closing price on May 30, 2014 (in Dollars per share) | $ / shares	$ 21.43
Value of common stock issued	$ 173,310,000
Value of replacement stock options granted	1,664,000
Total purchase price	$ 174,974,000

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Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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Number of shares of equity interests issued or issuable to acquire entity.

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-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
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-Subparagraph (b)(4)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

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