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Note 19 - Parent Company (Details) - Condensed Balance Sheet (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash and due from banks | $ 20,846 us-gaap_CashAndDueFromBanks | $ 20,926 us-gaap_CashAndDueFromBanks |  |
Investment securities available for sale | 154,334 us-gaap_AvailableForSaleSecurities | 157,143 us-gaap_AvailableForSaleSecurities |  |
Other assets | 9,635 us-gaap_OtherAssets | 11,716 us-gaap_OtherAssets |  |
TOTAL ASSETS | 677,531 us-gaap_Assets | 647,090 us-gaap_Assets |  |
LIABILITIES |  |  |  |
Short-term borrowings | 14,808 us-gaap_ShortTermBorrowings | 10,809 us-gaap_ShortTermBorrowings |  |
TOTAL LIABILITIES | 613,664 us-gaap_Liabilities | 593,617 us-gaap_Liabilities |  |
STOCKHOLDERS' EQUITY | 63,867 us-gaap_StockholdersEquity | 53,473 us-gaap_StockholdersEquity | 55,437 us-gaap_StockholdersEquity | 47,253 us-gaap_StockholdersEquity
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 677,531 us-gaap_LiabilitiesAndStockholdersEquity | 647,090 us-gaap_LiabilitiesAndStockholdersEquity |  |
Non-Bank Subsidiary [Member] | Parent Company [Member] |  |  |  |
ASSETS |  |  |  |
Investment in subsidiaries | 2,534 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mbcn_NonBankSubsidiaryMember | 2,560 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mbcn_NonBankSubsidiaryMember |  |
Subsidiary Banks [Member] | Parent Company [Member] |  |  |  |
ASSETS |  |  |  |
Investment in subsidiaries | 69,514 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mbcn_SubsidiaryBanksMember | 59,951 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mbcn_SubsidiaryBanksMember |  |
Parent Company [Member] |  |  |  |
ASSETS |  |  |  |
Cash and due from banks | 466 us-gaap_CashAndDueFromBanks / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 797 us-gaap_CashAndDueFromBanks / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Investment securities available for sale | 783 us-gaap_AvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 750 us-gaap_AvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other assets | 1,981 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,615 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
TOTAL ASSETS | 75,278 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 65,673 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
LIABILITIES |  |  |  |
Trust preferred securities | 8,248 us-gaap_SecuredDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 8,248 us-gaap_SecuredDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Short-term borrowings | 3,136 us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,895 us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other liabilities | 27 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 57 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
TOTAL LIABILITIES | 11,411 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 12,200 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
STOCKHOLDERS' EQUITY | 63,867 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 53,473 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | $ 75,278 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 65,673 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |

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