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Commitments (Details) - Outstanding Commitments and Contingent Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Commitments Contingencies And Litigation [Line Items]
Commitments	$ 116,538	$ 102,461
Commitments to Extend Credit [Member]
Commitments Contingencies And Litigation [Line Items]
Commitments	112,134	97,947
Financial Standby Letter of Credit [Member]
Commitments Contingencies And Litigation [Line Items]
Commitments	$ 4,404	$ 4,514

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- Definition

Commitments Contingencies And Litigation [Line Items]

+ References

No definition available.

+ Details

Name:	mbcn_CommitmentsContingenciesAndLitigationLineItems
Namespace Prefix:	mbcn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_FinancialStandbyLetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: