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Note 7 - Loans and Related Allowance for Loan and Lease Losses (Details) - Troubled Debt Restructurings (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Rate Forgiveness [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialAndIndustrialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = mbcn_RateForgivenessMember |
Rate Forgiveness [Member] | Residential Real Estate Mortgage [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = mbcn_RateForgivenessMember | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = mbcn_RateForgivenessMember
Rate Forgiveness [Member] | Consumer Installment [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts |  | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ConsumerInstallmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = mbcn_RateForgivenessMember
Other Restructurings [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialAndIndustrialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = mbcn_OtherRestructuringsMember |
Other Restructurings [Member] | Residential Real Estate Mortgage [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = mbcn_OtherRestructuringsMember | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = mbcn_OtherRestructuringsMember
Other Restructurings [Member] | Consumer Installment [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts |  | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ConsumerInstallmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = mbcn_OtherRestructuringsMember
Commercial and Industrial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialAndIndustrialMember |
Pre-Modification Outstanding Recorded Investment (in Dollars) | 48 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialAndIndustrialMember |
Residential Real Estate Mortgage [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember
Pre-Modification Outstanding Recorded Investment (in Dollars) | 175 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember | 49 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember
Consumer Installment [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts |  | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ConsumerInstallmentMember
Pre-Modification Outstanding Recorded Investment (in Dollars) |  | 7 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ConsumerInstallmentMember

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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