XML 86 R65.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Note 5 - Loans and Related Allowance for Loan and Lease Losses - Classes of the Loan Portfolio Summarized by Credit Quality (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Loans | $ 981,691 | $ 1,104,085
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] |  |
Loans | 111,470 | 103,121
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] |  |
Loans | 283,618 | 309,424
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member] |  |
Loans | 31,189 | 39,562
Residential Portfolio Segment [Member] |  |
Loans | 240,089 | 233,995
Commercial And Industrial [Member] |  |
Loans | 148,812 | 232,044
Home Equity Lines of Credit [Member] |  |
Loans | 104,355 | 112,543
Construction and Other [Member] |  |
Loans | 54,148 | 63,573
Consumer Portfolio Segment [Member] |  |
Loans | 8,010 | 9,823
Pass [Member] |  |
Loans | 912,229 | 1,030,290
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] |  |
Loans | 104,217 | 93,939
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] |  |
Loans | 230,672 | 258,974
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member] |  |
Loans | 31,189 | 39,562
Pass [Member] | Residential Portfolio Segment [Member] |  |
Loans | 237,132 | 230,944
Pass [Member] | Commercial And Industrial [Member] |  |
Loans | 143,911 | 227,765
Pass [Member] | Home Equity Lines of Credit [Member] |  |
Loans | 103,296 | 111,208
Pass [Member] | Construction and Other [Member] |  |
Loans | 53,807 | 58,082
Pass [Member] | Consumer Portfolio Segment [Member] |  |
Loans | 8,005 | 9,816
Special Mention [Member] |  |
Loans | 8,527 | 10,132
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] |  |
Loans | 2,400 | 7,084
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] |  |
Loans | 3,038 | 983
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member] |  |
Loans | 0 | 0
Special Mention [Member] | Residential Portfolio Segment [Member] |  |
Loans | 0 | 265
Special Mention [Member] | Commercial And Industrial [Member] |  |
Loans | 2,748 | 1,800
Special Mention [Member] | Home Equity Lines of Credit [Member] |  |
Loans | 0 | 0
Special Mention [Member] | Construction and Other [Member] |  |
Loans | 341 | 0
Special Mention [Member] | Consumer Portfolio Segment [Member] |  |
Loans | 0 | 0
Substandard [Member] |  |
Loans | 60,935 | 63,663
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] |  |
Loans | 4,853 | 2,098
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] |  |
Loans | 49,908 | 49,467
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member] |  |
Loans | 0 | 0
Substandard [Member] | Residential Portfolio Segment [Member] |  |
Loans | 2,957 | 2,786
Substandard [Member] | Commercial And Industrial [Member] |  |
Loans | 2,153 | 2,479
Substandard [Member] | Home Equity Lines of Credit [Member] |  |
Loans | 1,059 | 1,335
Substandard [Member] | Construction and Other [Member] |  |
Loans | 0 | 5,491
Substandard [Member] | Consumer Portfolio Segment [Member] |  |
Loans | 5 | 7
Doubtful [Member] |  |
Loans | 0 | 0
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] |  |
Loans | 0 | 0
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] |  |
Loans | 0 | 0
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member] |  |
Loans | 0 | 0
Doubtful [Member] | Residential Portfolio Segment [Member] |  |
Loans | 0 | 0
Doubtful [Member] | Commercial And Industrial [Member] |  |
Loans | 0 | 0
Doubtful [Member] | Home Equity Lines of Credit [Member] |  |
Loans | 0 | 0
Doubtful [Member] | Construction and Other [Member] |  |
Loans | 0 | 0
Doubtful [Member] | Consumer Portfolio Segment [Member] |  |
Loans | $ 0 | $ 0

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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123577603&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_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=mbcn_ConstructionAndOtherMember
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: |

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: |