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Note 22 - U.S. Treasury Capital Purchase Program Participation (Details) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 15, 2009 | Sep. 30, 2012 | Jun. 30, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 22 - U.S. Treasury Capital Purchase Program Participation (Details) [Line Items] |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ 21,000,000 us-gaap_ProceedsFromIssuanceOrSaleOfEquity |  |  |  |  |
Number of Cumulative Perpetual Preferred Shares Received by Treasury under Capital Purchase Program (in Shares) | 21,000 mbwm_NumberOfCumulativePerpetualPreferredSharesReceivedByTreasuryUnderCapitalPurchaseProgram |  |  |  |  |
Preferred Stock, Redemption Price Per Share (in Dollars per share) | $ 1,000 us-gaap_PreferredStockRedemptionPricePerShare |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares) | 616,438 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in Dollars per share) | $ 0 us-gaap_PreferredStockParOrStatedValuePerShare |  |  | $ 0 us-gaap_PreferredStockParOrStatedValuePerShare | $ 0 us-gaap_PreferredStockParOrStatedValuePerShare |
Cumulative Dividends Preferred Stock Dividend Rate Percentage for First Five Years | 5.00%mbwm_CumulativeDividendsPreferredStockDividendRatePercentageForFirstFiveYears |  |  |  |  |
Cumulative Dividends Preferred Stock Dividend Rate Percentage for After Five Years | 9.00%mbwm_CumulativeDividendsPreferredStockDividendRatePercentageForAfterFiveYears |  |  |  |  |
Warrant Expiration Period | 10 years |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share) | $ 5.11 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 |  |  |  |  |
Reduction from Retained Earnings Resulting from Accelerated Discount on Preferred Stock |  |  | 600,000 mbwm_ReductionFromRetainedEarningsResultingFromAcceleratedDiscountOnPreferredStock |  |  |
Amortization Period for Accelerated Discount on Preferred Stock |  |  | 5 years |  |  |
Payments for Repurchase of Warrants |  | 7,500,000 us-gaap_PaymentsForRepurchaseOfWarrants |  | 0 us-gaap_PaymentsForRepurchaseOfWarrants | 0 us-gaap_PaymentsForRepurchaseOfWarrants | 7,465,000 us-gaap_PaymentsForRepurchaseOfWarrants
Reduction in Shareholders' Equity Resulting from Repurchase of Warrant |  | 7,500,000 mbwm_ReductionInShareholdersEquityResultingFromRepurchaseOfWarrant |  |  |  |
Preferred Stock 1 [Member] |  |  |  |  |  |
Note 22 - U.S. Treasury Capital Purchase Program Participation (Details) [Line Items] |  |  |  |  |  |
Treasury Stock, Value, Acquired, Par Value Method |  |  | $ 21,000,000 us-gaap_TreasuryStockValueAcquiredParValueMethod / us-gaap_StatementClassOfStockAxis = mbwm_PreferredStock1Member |  |  |

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