XML 35 R59.htm IDEA: XBRL DOCUMENT
v3.20.1

Note 10 - Risks and Uncertainties - Summary of Payment Deferrals (Details) - Subsequent Event [Member] $ in Thousands | Apr. 21, 2020 USD ($)
--- | ---
Number of Loans | 252
Balance | $ 147,000
Commercial Portfolio Segment [Member] |
Number of Loans | 188
Balance | $ 107,021
% of Total Loans | 10.71%
Commercial Portfolio Segment [Member] | Residential Non-owner Occupied Loan [Member] |
Number of Loans | 9
Balance | $ 2,297
% of Total Loans | 0.23%
Commercial Portfolio Segment [Member] | Office Loan [Member] |
Number of Loans | 9
Balance | $ 1,776
% of Total Loans | 0.18%
Commercial Portfolio Segment [Member] | Retail Loan [Member] |
Number of Loans | 41
Balance | $ 52,443
% of Total Loans | 5.25%
Commercial Portfolio Segment [Member] | Restaurant/food service/bar Loan [Member] |
Number of Loans | 8
Balance | $ 3,320
% of Total Loans | 0.33%
Commercial Portfolio Segment [Member] | Hospitality and Tourism Loan [Member] |
Number of Loans | 8
Balance | $ 4,638
% of Total Loans | 0.46%
Commercial Portfolio Segment [Member] | Other Loans [Member] |
Number of Loans | 113
Balance | $ 42,547
% of Total Loans | 4.26%

X
- Definition The number of principal and interest payments and extension of maturity date payment deferrals on financing receivable. + References No definition available. + Details
Name: | mbcn_FinancingReceivableNumberOfPrincipalAndInterestAndExtensionOfMaturityDatePaymentDeferrals
Namespace Prefix: | mbcn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of principal and interest payment and extension of maturity date payment deferrals on financing receivable. + References No definition available. + Details
Name: | mbcn_FinancingReceivablePrincipalAndInterestPaymentsAndExtensionOfMaturityDatePaymentDeferrals
Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The percentage of total loans of principal and interest payments and extension of maturity date payment deferrals on financing receivable. + References No definition available. + Details
Name: | mbcn_FinancingReceivablePrincipalAndInterestPaymentsAndExtensionOfMaturityDatePaymentDeferralsPercentOfTotalLoans
Namespace Prefix: | mbcn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
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_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mbcn_ResidentialNonownerOccupiedLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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