XML 35 R53.htm IDEA: XBRL DOCUMENT
v3.3.0.814

Note 9 - Subsequent Events (Details) - Subsequent Event [Member] - Eric D. Hovde [Member] | Oct. 05, 2015 $ / shares shares
--- | ---
Note 9 - Subsequent Events (Details) [Line Items] |
Treasury Stock, Shares, Acquired | 196,635
Percentage of Outstanding Common Stock Owned by Third Party | 9.50%
Treasury Stock Acquired, Average Cost Per Share | $ / shares | $ 34.50

X
- References No definition available. + Details
Name: | mbcn_Note9SubsequentEventsDetailsLineItems
Namespace Prefix: | mbcn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of outstanding common stock owned by a third party. + References No definition available. + Details
Name: | mbcn_PercentageOfOutstandingCommonStockOwnedByThirdParty
Namespace Prefix: | mbcn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
Name: | us-gaap_TreasuryStockAcquiredAverageCostPerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
Name: | us-gaap_TreasuryStockSharesAcquired
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CounterpartyNameAxis=mbcn_EricDHovdeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |