XML 109 R77.htm IDEA: XBRL DOCUMENT v3.5.0.2

Short-term Borrowings (Details) - Repurchase Agreements (Detail) - Overnight and Continuous [Member] - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Repurchase agreements:
Repurchase agreements	$ 2,929	$ 3,181
US Government Agencies Debt Securities [Member]
Repurchase agreements:
Repurchase agreements	1,052	1,090
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Repurchase agreements:
Repurchase agreements	$ 1,877	$ 2,091

X

- Definition

Repurchase Agreements Abstract 0

+ References

No definition available.

+ Details

Name:	mbcn_RepurchaseAgreementsAbstract0
Namespace Prefix:	mbcn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Carrying amount of assets sold under agreements to repurchase when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under repurchase agreements exceeds 10 percent of total assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(m)(1)(i)(A)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_AssetsSoldUnderAgreementsToRepurchaseCarryingAmounts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis=mbcn_OvernightAndContinuousMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis=us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: