XML 21 R27.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Note 4 - Fair Value Disclosure Measurements (Details) - Assets Measured on a Recurring Basis (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | $ 180,771 | $ 194,473
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 0 | 0
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 26,343 | 24,960
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 0 | 0
US Government Agencies Debt Securities [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 26,343 | 24,960
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 0 | 0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 94,621 | 92,596
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 0 | 0
US States and Political Subdivisions Debt Securities [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 94,621 | 92,596
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 55,083 | 71,102
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis |  | 0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 55,083 | 71,102
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 0 | 0
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 3,974 | 5,064
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 0 | 0
Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 3,974 | 5,064
Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 0 | 0
Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 180,021 | 193,722
Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 0 | 0
Debt Securities [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 180,021 | 193,722
Equity Securities in Financial Institutions [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 5 | 5
Equity Securities in Financial Institutions [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 745 | 745
Equity Securities in Financial Institutions [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 0 | 0
Equity Securities in Financial Institutions [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 750 | 750
Fair Value, Inputs, Level 1 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 5 | 5
Fair Value, Inputs, Level 2 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 180,766 | 194,467
Fair Value, Inputs, Level 3 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | $ 0 | $ 0

X
- Details
Name: | mbcn_AssetsMeasuredOnARecurringBasisAbstract0
Namespace Prefix: | mbcn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 + Details
Name: | us-gaap_AvailableForSaleSecuritiesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant