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Note 17 - Regulatory Capital (Details Textual) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Jan. 01, 2019
Capital Conservation Buffer Phase in Amount | 0.625% |
Capital Conservation Buffer Phase-in Number of Years | 4 years |
Scenario, Forecast [Member] |  |
Capital Conservation Buffer Maximum Percentage |  | 2.50%

X
- Definition The maximum percentage that the capital conservation buffer will be after the final phase-in has taken effect. + References No definition available. + Details
Name: | mbcn_CapitalConservationBufferMaximumPercentage
Namespace Prefix: | mbcn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage that the capital conservation buffer will increase by each year until the maximum amount is reached. + References No definition available. + Details
Name: | mbcn_CapitalConservationBufferPhaseInAmount
Namespace Prefix: | mbcn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of years that the capital conservation buffer percentage will be stepped up on a per year basis. + References No definition available. + Details
Name: | mbcn_CapitalConservationBufferPhaseinNumberOfYears
Namespace Prefix: | mbcn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |