XML 119 R101.htm IDEA: XBRL DOCUMENT
v3.20.4

Note 18 - Fair Value Disclosure Measurements - Assets Measured on a Nonrecurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Impaired loans | $ 8,087 | $ 13,070
Fair Value, Nonrecurring [Member] |  |
Impaired loans | 4,111 | 5,166
Other real estate owned | 6,992 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |
Impaired loans | 0 | 0
Other real estate owned | 0 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |
Impaired loans | 0 | 0
Other real estate owned | 0 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |
Impaired loans | 4,111 | $ 5,166
Other real estate owned | $ 6,992 |

X
- Definition Fair value portion of other real estate owned. + References No definition available. + Details
Name: | mbcn_OtherRealEstateOwnedFairValueDisclosures
Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953550-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |