XML 116 R58.htm IDEA: XBRL DOCUMENT v2.4.1.9
Note 4 - Loans and Related Allowance for Loan Losses (Details) - Allowance for Loan Losses (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Ending allowance balance attributable to loans:                      
Individually evaluated for impairment       $ 1,807us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1       $ 1,596us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 $ 1,807us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1    
Collectively evaluated for impairment       5,239us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment       5,250us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment 5,239us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment    
Balance       7,046us-gaap_LoansAndLeasesReceivableAllowance       6,846us-gaap_LoansAndLeasesReceivableAllowance 7,046us-gaap_LoansAndLeasesReceivableAllowance 7,779us-gaap_LoansAndLeasesReceivableAllowance 6,819us-gaap_LoansAndLeasesReceivableAllowance
Charge-offs               (1,212)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs (1,330)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs (1,337)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs  
Recoveries               642us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts 401us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts 129us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts  
Provision 70us-gaap_ProvisionForLoanAndLeaseLosses 120us-gaap_ProvisionForLoanAndLeaseLosses 180us-gaap_ProvisionForLoanAndLeaseLosses (570)us-gaap_ProvisionForLoanAndLeaseLosses 153us-gaap_ProvisionForLoanAndLeaseLosses 300us-gaap_ProvisionForLoanAndLeaseLosses 313us-gaap_ProvisionForLoanAndLeaseLosses 370us-gaap_ProvisionForLoanAndLeaseLosses 196us-gaap_ProvisionForLoanAndLeaseLosses 2,168us-gaap_ProvisionForLoanAndLeaseLosses  
Commercial and Industrial [Member]                      
Ending allowance balance attributable to loans:                      
Individually evaluated for impairment       179us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
      83us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
179us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
   
Collectively evaluated for impairment       435us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
      559us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
435us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
   
Balance       614us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
      642us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
614us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
1,732us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
1,296us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
Charge-offs               (237)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
(419)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
(230)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
 
Recoveries               121us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
191us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
71us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
 
Provision               144us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
(890)us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
595us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
 
Real Estate Construction [Member]                      
Ending allowance balance attributable to loans:                      
Individually evaluated for impairment       210us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
      589us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
210us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
   
Collectively evaluated for impairment       366us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
      279us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
366us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
   
Balance       576us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
      868us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
576us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
1,123us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
438us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
Charge-offs                 (191)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
(135)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
 
Recoveries               60us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
33us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
   
Provision               232us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
(389)us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
820us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
 
Residential Real Estate Mortgage [Member]                      
Ending allowance balance attributable to loans:                      
Individually evaluated for impairment       855us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
      892us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
855us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
   
Collectively evaluated for impairment       2,809us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
      2,811us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
2,809us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
   
Balance       3,664us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
      3,703us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
3,664us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
2,872us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
3,731us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
Charge-offs               (671)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
(675)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
(785)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
 
Recoveries               267us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
107us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
31us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
 
Provision               443us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
1,360us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
(105)us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
 
Commercial Real Estate Mortgage [Member]                      
Ending allowance balance attributable to loans:                      
Individually evaluated for impairment       563us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
      30us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
563us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
   
Collectively evaluated for impairment       1,607us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
      1,546us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
1,607us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
   
Balance       2,170us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
      1,576us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
2,170us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
1,991us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
1,306us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
Charge-offs               (260)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
  (123)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
 
Recoveries               40us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
46us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
   
Provision               (374)us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
133us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
808us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
 
Consumer Installment [Member]                      
Ending allowance balance attributable to loans:                      
Individually evaluated for impairment               2us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember
     
Collectively evaluated for impairment       22us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember
      55us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember
22us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember
   
Balance       22us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember
      57us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember
22us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember
61us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember
48us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember
Charge-offs               (44)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember
(45)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember
(64)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember
 
Recoveries               154us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember
24us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember
27us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember
 
Provision               $ (75)us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember
$ (18)us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember
$ 50us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember