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Note 5 - Deposits (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Disclosure Text Block [Abstract]
Deposits	$ 1,108,251,000	$ 1,118,911,000
Change in Deposit Liabilities	$ (10,700,000)
Percentage of Decrease in Aggregate Deposits	1.00%

X

- Definition

Item represents the change in deposit liabilities for the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	mbwm_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Item represents the percentage of decrease in aggregate deposits.

+ References

No definition available.

+ Details

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Namespace Prefix:	mbwm_
Data Type:	num:percentItemType
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X

- Definition

The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.12)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 9

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Period Type:	instant

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