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Note 5 - Mortgage Loan Servicing - Mortgage Loans Serviced for Others (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Mortgage loans serviced for others	$ 1,376,143,000	$ 1,344,055,000
Federal Home Loan Mortgage Corporation [Member]
Mortgage loans serviced for others	1,345,312,000	1,320,550,000
Federa lHome Loan Bank [Member]
Mortgage loans serviced for others	$ 30,831,000	$ 23,505,000

X

- Definition

Principal amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_QualitativeAndQuantitativeInformationTransferorsContinuingInvolvementTransferredFinancialAssetsByTransferOrTransfereeAxis=mbwm_FederaLhomeLoanBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: