XML 99 R67.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Loans and Related Allowance for Loan and Lease Losses - Past Due Financing Receivables (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Loans, current balance | $ 583,017 | $ 529,146 | $ 465,164
Loans, past due | 3,312 | 4,564 | 5,420
Total loans | 586,329 | 533,710 | 470,584
Financing Receivables, 30 to 59 Days Past Due [Member] |  |  |
Loans, past due | 1,308 | 1,912 | 2,471
Financing Receivables, 60 to 89 Days Past Due [Member] |  |  |
Loans, past due | 639 | 121 | 434
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |  |
Loans, past due | 1,365 | 2,531 | 2,515
Commercial And Industrial [Member] |  |  |
Loans, current balance | 58,889 | 41,544 | 34,480
Loans, past due | 487 | 992 | 448
Total loans | 59,376 | 42,536 | 34,928
Commercial And Industrial [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |  |
Loans, past due | 59 | 225 | 349
Commercial And Industrial [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |  |
Loans, past due | 92 | 26 | 68
Commercial And Industrial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |  |
Loans, past due | 336 | 741 | 31
Real Estate Construction Porfolio Segment [Member] |  |  |
Loans, current balance | 17,633 | 22,137 | 30,296
Loans, past due | 0 |  |
Total loans | 17,633 | 22,137 | 30,296
Real Estate Construction Porfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |  |
Loans, past due | 0 | 0 |
Real Estate Construction Porfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |  |
Loans, past due | 0 | 0 |
Real Estate Construction Porfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |  |
Loans, past due | 0 | 0 |
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] |  |  |
Loans, current balance | 257,068 | 229,725 | 205,753
Loans, past due | 1,884 | 2,753 | 4,343
Total loans | 258,952 | 232,478 | 210,096
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member] |  |  |
Loans, current balance | 244,771 | 230,903 | 190,088
Loans, past due | 865 | 798 | 597
Total loans | 245,636 | 231,701 | 190,685
Real Estate Mortgage Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Residential Loan [Member] |  |  |
Loans, past due | 1,052 | 1,482 | 2,065
Real Estate Mortgage Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Loans [Member] |  |  |
Loans, past due | 121 | 189 | 30
Real Estate Mortgage Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Residential Loan [Member] |  |  |
Loans, past due | 547 | 92 | 363
Real Estate Mortgage Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Loans [Member] |  |  |
Loans, past due |  |  |
Real Estate Mortgage Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential Loan [Member] |  |  |
Loans, past due | 285 | 1,179 | 1,915
Real Estate Mortgage Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Loans [Member] |  |  |
Loans, past due | 744 | 609 | 567
Consumer Portfolio Segment [Member] |  |  |
Loans, current balance | 4,656 | 4,837 | 4,547
Loans, past due | 76 | 21 | 32
Total loans | 4,732 | 4,858 | 4,579
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |  |
Loans, past due | $ 76 | 16 | 27
Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |  |
Loans, past due |  | 3 | 3
Consumer Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |  |
Loans, past due |  | $ 2 | $ 2

X
- Definition Financing receivables that are current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953401-111524 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Recorded Investment -URI http://asc.fasb.org/extlink&oid=65880944 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953401-111524 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentPastDue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
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: |