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Note 9 - Short-term Borrowings (Details) - Outstanding Balances and Related Information of Short-term Borrowings (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Short-term Debt [Line Items] |  |
Balance at year-end | $ 14,808 us-gaap_ShortTermBorrowings | $ 10,809 us-gaap_ShortTermBorrowings
Average balance outstanding | 8,379 mbcn_ShortTermBorrowingsAverageBalanceOutstanding | 8,806 mbcn_ShortTermBorrowingsAverageBalanceOutstanding
Maximum month-end balance | $ 19,970 mbcn_ShortTermBorrowingsMaximumMonthendBalance | $ 17,351 mbcn_ShortTermBorrowingsMaximumMonthendBalance
Year End [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average rate | 0.98%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_ShortTermDebtTypeAxis = mbcn_YearEndMember | 1.44%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_ShortTermDebtTypeAxis = mbcn_YearEndMember
During the Year [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average rate | 1.77%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_ShortTermDebtTypeAxis = mbcn_DuringTheYearMember | 3.15%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_ShortTermDebtTypeAxis = mbcn_DuringTheYearMember

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- Definition Short-term borrowings average balance outstanding. + References No definition available. + Details
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- Definition Short-term borrowings maximum month-end balance. + References No definition available. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),16(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Subparagraph a(1) -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 2, 3 -Article 9 + Details
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- Details
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- Details
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Period Type: |