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Note 6 - Mortgage Loan Servicing (Details) - Mortgage Loans Serviced for Others (USD $) | Dec. 31, 2014
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Mortgage loan portfolios serviced for: |
Mortgage loans serviced for others | $ 590,820,000 us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
Federal Home Loan Mortgage Corporation [Member] |
Mortgage loan portfolios serviced for: |
Mortgage loans serviced for others | 589,118,000 us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding / us-gaap_QualitativeAndQuantitativeInformationTransferorsContinuingInvolvementTransferredFinancialAssetsByTransferOrTransfereeAxis = mbwm_FederalHomeLoanMortgageCorporationMember
Federal Home Loan Bank [Member] |
Mortgage loan portfolios serviced for: |
Mortgage loans serviced for others | $ 1,702,000 us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding / us-gaap_QualitativeAndQuantitativeInformationTransferorsContinuingInvolvementTransferredFinancialAssetsByTransferOrTransfereeAxis = mbwm_FederalHomeLoanBankMember

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- 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107314-111719 + Details
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