XML 72 R58.htm IDEA: XBRL DOCUMENT v3.3.1.900

Note 4 - Loans and Related Allowance for Loan Losses (Details) - Allowance for Loan Losses - USD ($) $ in Thousands	3 Months Ended						12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014
Ending allowance balance attributable to loans:
Individually evaluated for impairment										$ 833	$ 1,596
Collectively evaluated for impairment										5,552	5,250
Total ending allowance balance	$ 6,385		$ 6,846			$ 7,046	$ 6,385	$ 6,846	$ 7,046	6,385	6,846
Ending allowance balance attributable to loans:
ALLL balance, period start			6,846			7,046	6,846	7,046	7,779
Charge-offs							(1,197)	(1,212)	(1,330)
Recoveries							421	642	401
Provision	105	$ 105	105	$ 70	$ 120	180	315	370	196
ALLL balance, period end	6,385						6,385	6,846	7,046
Commercial and Industrial [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment										388	83
Collectively evaluated for impairment										479	559
Total ending allowance balance	867		642			614	867	642	614	867	642
Ending allowance balance attributable to loans:
ALLL balance, period start			642			614	642	614	1,732
Charge-offs							(280)	(237)	(419)
Recoveries							207	121	191
Provision							298	144	(890)
ALLL balance, period end	867						867	642	614
Real Estate Construction Porfolio Segment [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment										130	589
Collectively evaluated for impairment										146	279
Total ending allowance balance	276		868			576	276	868	576	276	868
Ending allowance balance attributable to loans:
ALLL balance, period start			868			576	868	576	1,123
Charge-offs							(385)	0	(191)
Recoveries							0	60	33
Provision							(207)	232	(389)
ALLL balance, period end	276						276	868	576
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment										276	892
Collectively evaluated for impairment										2,863	2,811
Total ending allowance balance	3,139		3,703			3,664	3,139	3,703	3,664	3,139	3,703
Ending allowance balance attributable to loans:
ALLL balance, period start			3,703			3,664	3,703	3,664	2,872
Charge-offs							(425)	(671)	(675)
Recoveries							186	267	107
Provision							(325)	443	1,360
ALLL balance, period end	3,139						3,139	3,703	3,664
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment										39	30
Collectively evaluated for impairment										2,039	1,546
Total ending allowance balance	2,078		1,576			2,170	2,078	1,576	2,170	2,078	1,576
Ending allowance balance attributable to loans:
ALLL balance, period start			1,576			2,170	1,576	2,170	1,991
Charge-offs							(92)	(260)	0
Recoveries							5	40	46
Provision							589	(374)	133
ALLL balance, period end	2,078						2,078	1,576	2,170
Consumer Portfolio Segment [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment										0	2
Collectively evaluated for impairment										25	55
Total ending allowance balance	25		57			22	25	57	22	$ 25	$ 57
Ending allowance balance attributable to loans:
ALLL balance, period start			$ 57			$ 22	57	22	61
Charge-offs							(15)	(44)	(45)
Recoveries							23	154	24
Provision							(40)	(75)	(18)
ALLL balance, period end	$ 25						$ 25	$ 57	$ 22

X

- References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	mbcn_EndingAllowanceBalanceAttributableToLoansAbstract0
Namespace Prefix:	mbcn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

+ Details

Name:	us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

+ Details

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

X

- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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 210.9-03.7(d))
-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 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section L
-Subsection 1

+ Details

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

X

- Definition

Amount of expense related to estimated loss from loan and lease transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

+ Details

Name:	us-gaap_ProvisionForLoanAndLeaseLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=mbcn_CommercialAndIndustrialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=mbcn_RealEstateConstructionPorfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=mbcn_RealEstateMortgagePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mbcn_ResidentialLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mbcn_CommercialLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: