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Note 8 - Other Real Estate Owned ("OREO") (Details) (USD $) | Mar. 31, 2015 | Dec. 31, 2014
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Disclosure Text Block [Abstract] |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets | $ 2,203,000 us-gaap_OtherRealEstateAndForeclosedAssets | $ 2,590,000 us-gaap_OtherRealEstateAndForeclosedAssets
Other Real Estate, Foreclosed Assets, Initiated Formal Foreclosure Proceedings | $ 60,000 mbcn_OtherRealEstateForeclosedAssetsInitiatedFormalForeclosureProceedings |

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- Definition Represents the amount of other real estate that has been initiated to be acquired. + References No definition available. + Details
Name: | mbcn_OtherRealEstateForeclosedAssetsInitiatedFormalForeclosureProceedings
Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_DisclosureTextBlockAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_OtherRealEstateAndForeclosedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant