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Note 11 - Other Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Other Liabilities [Table Text Block] |
|  | 2012 |  |  | 2011 |
Accrued interest payable |  | $ | 492 |  |  | $ | 645 |
Other |  |  | 1,516 |  |  |  | 1,468 |
Total |  | $ | 2,008 |  |  | $ | 2,113 |

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- Definition Schedule of other liabilities. + References No definition available. + Details
Name: | mbcn_ScheduleOfOtherLiabilitiesTableTextBlock
Namespace Prefix: | mbcn_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration