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Note 8 - Accrued Interest Receivable and Other Assets (Details Textual) $ in Millions | Dec. 31, 2020 USD ($)
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Related Party Deposit Assets | $ 38.6

X
- Definition Amount of deposits held by a related party for the entity. + References No definition available. + Details
Name: | mbcn_RelatedPartyDepositAssets
Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant