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Note 4 - Loans and Allowance for Loan Losses (Details) - Allowance Related to Troubled Debt Restructurings (USD $) | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Commercial: |  |
Allowance for losses, troubled debt restructurings | $ 11,233,000 | $ 10,351,000
Commercial and Industrial [Member] |  |
Commercial: |  |
Allowance for losses, troubled debt restructurings | 514,000 | 187,000
Commercial Vacant Land and Land Development and Residential Construction Loan [Member] |  |
Commercial: |  |
Allowance for losses, troubled debt restructurings | 1,672,000 | 798,000
Commercial Real Estate Owner Occupied Loan [Member] |  |
Commercial: |  |
Allowance for losses, troubled debt restructurings | 1,419,000 | 528,000
Commercial Real Estate Non Owner Occupied Loan [Member] |  |
Commercial: |  |
Allowance for losses, troubled debt restructurings | 1,773,000 | 7,828,000
Commercial Real Estate Multi Family and Residential Rental Loan [Member] |  |
Commercial: |  |
Allowance for losses, troubled debt restructurings | 5,855,000 | 1,010,000
Commercial Portfolio Segment [Member] |  |
Commercial: |  |
Allowance for losses, troubled debt restructurings | 11,233,000 | 10,351,000
Retail Home Equity and Other [Member] |  |
Commercial: |  |
Allowance for losses, troubled debt restructurings | 0 | 0
Retail 1-4 Family Mortgages [Member] |  |
Commercial: |  |
Allowance for losses, troubled debt restructurings | 0 | 0
Retail Loan [Member] |  |
Commercial: |  |
Allowance for losses, troubled debt restructurings | $ 0 | $ 0

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- Details
Name: | mbwm_CommercialAbstract000000000000000000000
Namespace Prefix: | mbwm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of allowance for credit losses related to receivables which had been measured under a general allowance for credit losses methodology that are now identified as troubled debt restructurings. + References No definition available. + Details
Name: | us-gaap_AllowanceForCreditLossesChangeInMethodOfCalculatingImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant