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Note 7 - Loans and Related Allowance for Loan and Lease Losses (Details) - Additional Information on Impaired Loans (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Total: |  |
Impaired Financing Receivable - Average Recorded Investment | $ 13,213 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment | $ 17,358 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Impaired Financing Receivable - Interest Income Recognized | 110 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod | 210 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Commercial and Industrial [Member] |  |
Total: |  |
Impaired Financing Receivable - Average Recorded Investment | 1,227 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialAndIndustrialMember | 2,558 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialAndIndustrialMember
Impaired Financing Receivable - Interest Income Recognized | 14 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialAndIndustrialMember | 37 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialAndIndustrialMember
Real Estate Construction [Member] |  |
Total: |  |
Impaired Financing Receivable - Average Recorded Investment | 2,882 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_RealEstateConstructionMember | 3,719 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_RealEstateConstructionMember
Impaired Financing Receivable - Interest Income Recognized | 20 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_RealEstateConstructionMember | 41 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_RealEstateConstructionMember
Residential Real Estate Mortgage [Member] |  |
Total: |  |
Impaired Financing Receivable - Average Recorded Investment | 4,833 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember | 5,239 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember
Impaired Financing Receivable - Interest Income Recognized | 38 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember | 57 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember
Commercial Real Estate Mortgage [Member] |  |
Total: |  |
Impaired Financing Receivable - Average Recorded Investment | 4,266 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialRealEstateMortgageMember | 5,827 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialRealEstateMortgageMember
Impaired Financing Receivable - Interest Income Recognized | 39 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialRealEstateMortgageMember | 75 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialRealEstateMortgageMember
Consumer Installment [Member] |  |
Total: |  |
Impaired Financing Receivable - Average Recorded Investment | $ 6 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ConsumerInstallmentMember | $ 15 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ConsumerInstallmentMember

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
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