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Note 10 - Risks and Uncertainties - PPP Loan Amounts That Could Be Forgiven (Details) - Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member] $ in Thousands | Jun. 30, 2020 USD ($)
--- | ---
Number of Loans | 1,302
Loan Balance | $ 141,300
Loans Over Two Million [Member] |
Number of Loans | 6
Loan Balance | $ 14,774
Loans Between 350,000 and Two Million [Member] |
Number of Loans | 92
Loan Balance | $ 69,361
Loans Between 150,000 and 350,000 [Member] |
Number of Loans | 96
Loan Balance | $ 20,768
Loans Under 150,000 [Member] |
Number of Loans | 1,108
Loan Balance | $ 36,397

X
- Definition The possible amount that could be forgiven. + References No definition available. + Details
Name: | mbcn_FinancingRecievablePossibleAmountForgiven
Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The number of loans that could be forgiven. + References No definition available. + Details
Name: | mbcn_NumberOfLoansThatCouldBeForgiven
Namespace Prefix: | mbcn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis=mbcn_SmallBusinessAdministrationSbaCaresActPaycheckProtectionProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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