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Short-Term Borrowings (Details Textual) | 9 Months Ended
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Sep. 30, 2012
Short-Term Borrowings (Textual) [Abstract] |
Repurchase agreements original maturity description | less than one year

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- Details
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Namespace Prefix: | mbwm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This describes the time frame of the terms of the entity's repurchase agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration