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Note 1 - Summary of Significant Accounting Policies (Details) - Year-end Mortgage Loans Held for Sale - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Year-end Mortgage Loans Held for Sale [Abstract]
Mortgage loans held for sale	$ 1,316,000	$ 1,574,000
Less: Allowance to adjust to lower of cost or market	0	0
Mortgage loans held for sale, net	$ 1,316,000	$ 1,574,000

X

- Definition

Amount of allowance to adjust mortgage loans receivable held for sale to lower of cost or market price.

+ References

No definition available.

+ Details

Name:	mbwm_AllowanceToAdjustToLowerOfCostOrMarket
Namespace Prefix:	mbwm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount, before allowance to adjust to lower of cost or market, of mortgage loan receivables held-for-sale that are not part of a disposal group.

+ References

No definition available.

+ Details

Name:	mbwm_LoansReceivableHeldForSaleAmountNotPartOfDisposalGroupMortgage
Namespace Prefix:	mbwm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	mbwm_YearEndMortgageLoansHeldForSaleAbstract
Namespace Prefix:	mbwm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount, after allowance for bad debt, of mortgage loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

+ Details

Name:	us-gaap_LoansReceivableHeldForSaleNetNotPartOfDisposalGroupMortgage
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant