XML 58 R45.htm IDEA: XBRL DOCUMENT
v3.4.0.3

Note 7 - Loans and Related Allowance for Loan Losses (Details) - Classes of the Loan Portfolio Summarized by Credit Quality - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | $ 530,356 | $ 533,710
Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 512,281 | 512,697
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 2,201 | 5,297
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 15,755 | 15,586
Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 119 | 130
Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 47,436 | 42,536
Commercial and Industrial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 45,742 | 40,560
Commercial and Industrial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 485 | 242
Commercial and Industrial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 1,209 | 1,734
Commercial and Industrial [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total |  | 0
Real Estate Construction Porfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 21,005 | 22,137
Real Estate Construction Porfolio Segment [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 20,886 | 22,007
Real Estate Construction Porfolio Segment [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total |  | 0
Real Estate Construction Porfolio Segment [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 0 | 0
Real Estate Construction Porfolio Segment [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 119 | 130
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 238,489 | 232,478
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 231,785 | 225,945
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 493 | 728
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 6,211 | 5,805
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 0 | 0
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 218,363 | 231,701
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 208,808 | 219,331
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 1,223 | 4,327
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 8,332 | 8,043
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 0 | 0
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 5,063 | 4,858
Consumer Portfolio Segment [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 5,060 | 4,854
Consumer Portfolio Segment [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 0 | 0
Consumer Portfolio Segment [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | 3 | 4
Consumer Portfolio Segment [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, total | $ 0 | $ 0

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522 Reference 2: 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=66008989&loc=d3e5074-111524 + Details
Name: | us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_DoubtfulMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=mbcn_CommercialAndIndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=mbcn_RealEstateConstructionPorfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=mbcn_RealEstateMortgagePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mbcn_ResidentialLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mbcn_CommercialLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |