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Note 10 - Other Borrowings (Details) - Other Borrowings (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Note 10 - Other Borrowings (Details) - Other Borrowings [Line Items] |  |
Balance | $ 10,624 us-gaap_OtherBorrowings | $ 11,609 us-gaap_OtherBorrowings
Fixed Rate Amortizing [Member] | Minimum [Member] |  |
Note 10 - Other Borrowings (Details) - Other Borrowings [Line Items] |  |
Stated interest rate | 2.99%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mbcn_FixedRateAmortizingMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Fixed Rate Amortizing [Member] | Maximum [Member] |  |
Note 10 - Other Borrowings (Details) - Other Borrowings [Line Items] |  |
Stated interest rate | 4.48%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mbcn_FixedRateAmortizingMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Fixed Rate Amortizing [Member] |  |
Note 10 - Other Borrowings (Details) - Other Borrowings [Line Items] |  |
Earliest Maturity Date | Jun. 01, 2015 |
Latest Maturity Date | Oct. 01, 2028 |
Weighted average interest rate | 4.00%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_LongtermDebtTypeAxis = mbcn_FixedRateAmortizingMember |
Balance | 2,376 us-gaap_OtherBorrowings / us-gaap_LongtermDebtTypeAxis = mbcn_FixedRateAmortizingMember | 3,361 us-gaap_OtherBorrowings / us-gaap_LongtermDebtTypeAxis = mbcn_FixedRateAmortizingMember
Junior Subordinated Debt [Member] | Minimum [Member] |  |
Note 10 - Other Borrowings (Details) - Other Borrowings [Line Items] |  |
Stated interest rate | 1.89%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Junior Subordinated Debt [Member] | Maximum [Member] |  |
Note 10 - Other Borrowings (Details) - Other Borrowings [Line Items] |  |
Stated interest rate | 1.91%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Junior Subordinated Debt [Member] |  |
Note 10 - Other Borrowings (Details) - Other Borrowings [Line Items] |  |
Earliest Maturity Date | Dec. 21, 2037 |
Latest Maturity Date | Dec. 21, 2037 |
Weighted average interest rate | 1.90%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember |
Balance | $ 8,248 us-gaap_OtherBorrowings / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember | $ 8,248 us-gaap_OtherBorrowings / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember

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- Definition The average effective interest rate during the reporting period. + 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 Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -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 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Earliest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -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 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 + Details
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