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Note 7 - Loans and Related Allowance for Loan and Lease Losses (Details) - Troubled Debt Restructurings Subsequently Defaulted (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts | 0 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 | 0 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 |
Commercial and Industrial [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts |  |  | 6 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialAndIndustrialMember
Recorded investment |  |  | $ 248 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialAndIndustrialMember
Residential Real Estate Mortgage [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts |  |  | 1 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember
Recorded investment |  |  | 68 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember
Commercial Real Estate Mortgage [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts |  |  | 1 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialRealEstateMortgageMember
Recorded investment |  |  | $ 5 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialRealEstateMortgageMember

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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524 + Details
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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524 + Details
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