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Note 8 - Deposits (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Maturities of Time Deposits of $100,000 or More [Table Text Block] |
(Dollar amounts in thousands) |  | Amount |  |  | Percent of Total |
Within three months |  | $ | 10,031 |  |  |  | 12.55 | %
Beyond three but within six months |  |  | 9,005 |  |  |  | 11.27 |
Beyond six but within twelve months |  |  | 18,234 |  |  |  | 22.82 |
Beyond one year |  |  | 42,648 |  |  |  | 53.36 |
Total |  | $ | 79,918 |  |  |  | 100.00 | %

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- Definition Schedule of maturities of time deposits of $100,000 or more. + References No definition available. + Details
Name: | mbcn_ScheduleOfMaturitiesOfTimeDepositsOf100000OrMoreTableTextBlock
Namespace Prefix: | mbcn_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration