XML 63 R51.htm IDEA: XBRL DOCUMENT
v3.24.3

Note 7 - Loans and Related Allowance for Credit Losses - Nonaccrual Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Nonaccrual, No Allowance | $ 22,666 | $ 4,687
Nonaccrual, With Allowance | 7,380 | 6,190
Nonaccrual | 30,046 | 10,877
Still Accruing | 32 | 0
Financing Receivable, before Allowance for Credit Loss, Total | 1,504,531 | 1,478,130
Nonperforming Financial Instruments [Member] |  |
Financing Receivable, before Allowance for Credit Loss, Total | 30,078 | 10,877
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] |  |
Nonaccrual, No Allowance | 0 | 0
Nonaccrual, With Allowance | 310 | 252
Nonaccrual | 310 | 252
Still Accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss, Total | 187,313 | 183,545
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] | Nonperforming Financial Instruments [Member] |  |
Financing Receivable, before Allowance for Credit Loss, Total | 310 | 252
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] |  |
Nonaccrual, No Allowance | 21,870 | 4,534
Nonaccrual, With Allowance | 3,616 | 3,616
Nonaccrual | 25,486 | 8,150
Still Accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss, Total | 407,159 | 401,580
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] | Nonperforming Financial Instruments [Member] |  |
Financing Receivable, before Allowance for Credit Loss, Total | 25,486 | 8,150
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member] |  |
Financing Receivable, before Allowance for Credit Loss, Total | 94,798 | 82,506
Residential Portfolio Segment [Member] |  |
Nonaccrual, No Allowance | 617 | 0
Nonaccrual, With Allowance | 1,321 | 1,170
Nonaccrual | 1,938 | 1,170
Still Accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss, Total | 345,748 | 328,854
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] |  |
Financing Receivable, before Allowance for Credit Loss, Total | 1,938 | 1,170
Commercial Portfolio Segment [Member] | Multifamily Loan [Member] |  |
Nonaccrual, No Allowance |  | 0
Nonaccrual, With Allowance |  | 66
Nonaccrual |  | 66
Still Accruing |  | 0
Commercial Portfolio Segment [Member] | Multifamily Loan [Member] | Nonperforming Financial Instruments [Member] |  |
Financing Receivable, before Allowance for Credit Loss, Total |  | 66
Commercial And Industrial [Member] |  |
Nonaccrual, No Allowance | 0 | 0
Nonaccrual, With Allowance | 1,212 | 223
Nonaccrual | 1,212 | 223
Still Accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss, Total | 213,172 | 221,508
Commercial And Industrial [Member] | Nonperforming Financial Instruments [Member] |  |
Financing Receivable, before Allowance for Credit Loss, Total | 1,212 | 223
Home Equity Lines of Credit [Member] |  |
Nonaccrual, No Allowance | 0 | 0
Nonaccrual, With Allowance | 916 | 856
Nonaccrual | 916 | 856
Still Accruing | 32 | 0
Financing Receivable, before Allowance for Credit Loss, Total | 137,761 | 127,818
Home Equity Lines of Credit [Member] | Nonperforming Financial Instruments [Member] |  |
Financing Receivable, before Allowance for Credit Loss, Total | 948 | 856
Consumer Portfolio Segment [Member] |  |
Nonaccrual, No Allowance | 179 | 153
Nonaccrual, With Allowance | 5 | 7
Nonaccrual | 184 | 160
Still Accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss, Total | 7,030 | 7,214
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] |  |
Financing Receivable, before Allowance for Credit Loss, Total | 184 | 160
Construction and Other [Member] |  |
Nonaccrual, No Allowance |  | 0
Nonaccrual, With Allowance |  | 0
Nonaccrual |  | 0
Still Accruing |  | 0
Financing Receivable, before Allowance for Credit Loss, Total | $ 111,550 | 125,105
Construction and Other [Member] | Nonperforming Financial Instruments [Member] |  |
Financing Receivable, before Allowance for Credit Loss, Total |  | $ 0

X
- Definition Amortized cost of financing receivable on nonaccrual status with allowance for credit loss. Excludes net investment in lease. + References No definition available. + Details
Name: | mbcn_FinancingReceivableNonaccrualWithAllowance
Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-16 + Details
Name: | us-gaap_FinancingReceivableNonaccrualNoAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost of financing receivable 90 days or more past due and still accruing. Excludes net investment in lease. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-7 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 80 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-80 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-16 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph a -Subparagraph (3) -Publisher SEC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph a -Subparagraph (2) -Publisher SEC Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-16 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-13 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-7A Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 29 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-29 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph a -Subparagraph (1) -Publisher SEC Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph a -Subparagraph (2) -Publisher SEC Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Name Regulation S-K (SK) -Number 229 -Section 1404 -Paragraph a -Publisher SEC Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 80 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-80 Reference 8: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-14 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_NotesReceivableGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentPerformanceStatusAxis=us-gaap_NonperformingFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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=us-gaap_CommercialPortfolioSegmentMember
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=us-gaap_ConsumerPortfolioSegmentMember
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: |