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Note 14 - Commitments (Details) - Outstanding Commitments and Contingent Liabilities (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Note 14 - Commitments (Details) - Outstanding Commitments and Contingent Liabilities [Line Items]
Commitments	$ 125,670	$ 92,135
Financial Standby Letter of Credit [Member]
Note 14 - Commitments (Details) - Outstanding Commitments and Contingent Liabilities [Line Items]
Commitments	4,809	281
Commitments to Extend Credit [Member]
Note 14 - Commitments (Details) - Outstanding Commitments and Contingent Liabilities [Line Items]
Commitments	$ 120,861	$ 91,854

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- Details

Name:	mbcn_Note14CommitmentsDetailsOutstandingCommitmentsandContingentLiabilitiesLineItems
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