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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
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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
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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