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Note 12 - Fair Values (Details) - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Fair Value, Measurements, Nonrecurring [Member], USD $) | Mar. 31, 2015 | Dec. 31, 2014
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Note 12 - Fair Values (Details) - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Line Items] |  |  |  |
Impaired loans | $ 36,958,000 mbwm_ImpairedLoansFairValueDisclosure | [1] | $ 17,097,000 mbwm_ImpairedLoansFairValueDisclosure | [1]
Foreclosed assets | 1,664,000 mbwm_ForeclosedAssetsFairValueDisclosure | [1] | 1,995,000 mbwm_ForeclosedAssetsFairValueDisclosure | [1]
Assets and liabilities measured at fair value on a nonrecurring basis | 38,622,000 us-gaap_AssetsFairValueDisclosure |  | 19,092,000 us-gaap_AssetsFairValueDisclosure |
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Note 12 - Fair Values (Details) - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Line Items] |  |  |  |
Impaired loans | 0 mbwm_ImpairedLoansFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | [1] | 0 mbwm_ImpairedLoansFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | [1]
Foreclosed assets | 0 mbwm_ForeclosedAssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | [1] | 0 mbwm_ForeclosedAssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | [1]
Assets and liabilities measured at fair value on a nonrecurring basis | 0 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  | 0 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Note 12 - Fair Values (Details) - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Line Items] |  |  |  |
Impaired loans | 0 mbwm_ImpairedLoansFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | [1] | 0 mbwm_ImpairedLoansFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | [1]
Foreclosed assets | 0 mbwm_ForeclosedAssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | [1] | 0 mbwm_ForeclosedAssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | [1]
Assets and liabilities measured at fair value on a nonrecurring basis | 0 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  | 0 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Note 12 - Fair Values (Details) - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Line Items] |  |  |  |
Impaired loans | 36,958,000 mbwm_ImpairedLoansFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | [1] | 17,097,000 mbwm_ImpairedLoansFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | [1]
Foreclosed assets | 1,664,000 mbwm_ForeclosedAssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | [1] | 1,995,000 mbwm_ForeclosedAssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | [1]
Assets and liabilities measured at fair value on a nonrecurring basis | $ 38,622,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  | $ 19,092,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |
[1] | Represents carrying value and related write-downs for which adjustments are based on the estimated value of the property or other assets.

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- Definition The fair value disclosure of foreclosed assets held by the company. + References No definition available. + Details
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Namespace Prefix: | mbwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The fair value disclosure of impaired loans held by the company. + References No definition available. + Details
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Namespace Prefix: | mbwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | mbwm_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant