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Note 7 - Loans and Related Allowance for Loan and Lease Losses (Details) - Classes of the Loan Portfolio Summarized by Credit Quality (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | $ 475,818 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome | $ 470,584 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Commercial and Industrial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | 47,707 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 58,976 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember
Commercial and Industrial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | 168 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember |
Commercial and Industrial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | 1,003 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 1,730 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Commercial and Industrial [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | 38 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember | 38 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember
Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | 48,916 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialAndIndustrialMember | 60,744 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialAndIndustrialMember
Real Estate Construction [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | 23,065 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_RealEstateConstructionMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 29,212 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_RealEstateConstructionMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember
Real Estate Construction [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | 1,403 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_RealEstateConstructionMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember | 495 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_RealEstateConstructionMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember
Real Estate Construction [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | 114 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_RealEstateConstructionMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember |
Real Estate Construction [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | 181 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_RealEstateConstructionMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember | 589 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_RealEstateConstructionMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember
Real Estate Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | 24,763 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_RealEstateConstructionMember | 30,296 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_RealEstateConstructionMember
Residential Real Estate Mortgage [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | 223,187 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 218,244 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember
Residential Real Estate Mortgage [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | 780 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember | 584 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember
Residential Real Estate Mortgage [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | 7,869 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 8,724 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Residential Real Estate Mortgage [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | 231,836 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember | 227,552 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember
Commercial Real Estate Mortgage [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | 155,831 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialRealEstateMortgageMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 137,755 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialRealEstateMortgageMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember
Commercial Real Estate Mortgage [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | 4,433 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialRealEstateMortgageMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember | 3,908 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialRealEstateMortgageMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember
Commercial Real Estate Mortgage [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | 5,416 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialRealEstateMortgageMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 5,750 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialRealEstateMortgageMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Commercial Real Estate Mortgage [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | 165,680 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialRealEstateMortgageMember | 147,413 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialRealEstateMortgageMember
Consumer Installment [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | 4,617 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ConsumerInstallmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 4,572 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ConsumerInstallmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember
Consumer Installment [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | 6 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ConsumerInstallmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 7 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ConsumerInstallmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Consumer Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | 4,623 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ConsumerInstallmentMember | 4,579 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ConsumerInstallmentMember
Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | 454,407 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 448,759 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | 6,784 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember | 4,987 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | 14,408 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 16,211 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable | $ 219 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember | $ 627 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember

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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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