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Note 3 - Loans and Allowance for Loan Losses (Details) - Activity for Retail Loans Categorized as Troubled Debt Restructurings (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Retail Home Equity and Other [Member] |  |
Retail Loan Portfolio: |  |
Beginning Balance | $ 0 | $ 0
Ending Balance | 0 | 0
Charge-Offs | 0 | 0
Payments | 0 | 0
Transfers to ORE | 0 | 0
Net Additions/Deletions | 0 | 0
Retail 1-4 Family Mortgages [Member] |  |
Retail Loan Portfolio: |  |
Beginning Balance | 2,191,000 | 154,000
Ending Balance | 2,122,000 | 152,000
Charge-Offs | 0 | 0
Payments | (69,000) | (2,000)
Transfers to ORE | 0 | 0
Net Additions/Deletions | $ 0 | $ 0

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- Definition Financing receivable modified as troubled debt restructurings additions. + References No definition available. + Details
Name: | mbwm_FinancingReceivableModifiedAsTroubledDebtRestructuringsAdditions
Namespace Prefix: | mbwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Financing receivable modified as troubled debt restructurings charge offs. + References No definition available. + Details
Name: | mbwm_FinancingReceivableModifiedAsTroubledDebtRestructuringsChargeOffs
Namespace Prefix: | mbwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Financing receivable modified as troubled debt restructurings payments. + References No definition available. + Details
Name: | mbwm_FinancingReceivableModifiedAsTroubledDebtRestructuringsPayments
Namespace Prefix: | mbwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Financing receivable modified as troubled debt restructurings transfer to other real estate. + References No definition available. + Details
Name: | mbwm_FinancingReceivableModifiedAsTroubledDebtRestructuringsTransferToOtherRealEstate
Namespace Prefix: | mbwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant