XML 71 R59.htm IDEA: XBRL DOCUMENT v2.4.1.9
Note 4 - Loans and Related Allowance for Loan Losses (Details) - Impaired Loans by Class (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
With no related allowance recorded:    
Recorded investment, with no related allowance $ 10,119us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment $ 9,284us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
Unpaid principal balance, with no related allowance 10,107us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance 9,472us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
With an allowance recorded:    
Recorded investment, with related allowance 4,249us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment 9,681us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Unpaid principal balance, with related allowance 4,246us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance 9,720us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
Related allowance 1,596us-gaap_ImpairedFinancingReceivableRelatedAllowance 1,807us-gaap_ImpairedFinancingReceivableRelatedAllowance
Total:    
Recorded investment 14,368us-gaap_ImpairedFinancingReceivableRecordedInvestment 18,965us-gaap_ImpairedFinancingReceivableRecordedInvestment
Unpaid principal balance 14,353us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance 19,192us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Related allowance 1,596us-gaap_ImpairedFinancingReceivableRelatedAllowance 1,807us-gaap_ImpairedFinancingReceivableRelatedAllowance
Commercial and Industrial [Member]    
With no related allowance recorded:    
Recorded investment, with no related allowance 1,146us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember		 1,357us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
Unpaid principal balance, with no related allowance 1,145us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember		 1,357us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
With an allowance recorded:    
Recorded investment, with related allowance 247us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember		 534us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
Unpaid principal balance, with related allowance 247us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember		 534us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
Related allowance 83us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember		 179us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
Total:    
Recorded investment 1,393us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember		 1,891us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
Unpaid principal balance 1,392us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember		 1,891us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
Related allowance 83us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember		 179us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialAndIndustrialMember
Real Estate Construction [Member]    
With no related allowance recorded:    
Recorded investment, with no related allowance 2,707us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember		 124us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
Unpaid principal balance, with no related allowance 2,705us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember		 124us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
With an allowance recorded:    
Recorded investment, with related allowance 589us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember		 3,887us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
Unpaid principal balance, with related allowance 589us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember		 3,887us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
Related allowance 589us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember		 210us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
Total:    
Recorded investment 3,296us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember		 4,011us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
Unpaid principal balance 3,294us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember		 4,011us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
Related allowance 589us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember		 210us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
Residential Real Estate Mortgage [Member]    
With no related allowance recorded:    
Recorded investment, with no related allowance 2,202us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember		 2,704us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
Unpaid principal balance, with no related allowance 2,197us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember		 2,892us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
With an allowance recorded:    
Recorded investment, with related allowance 2,981us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember		 3,178us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
Unpaid principal balance, with related allowance 2,978us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember		 3,217us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
Related allowance 892us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember		 855us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
Total:    
Recorded investment 5,183us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember		 5,882us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
Unpaid principal balance 5,175us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember		 6,109us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
Related allowance 892us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember		 855us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ResidentialRealEstateMortgageMember
Commercial Real Estate Mortgage [Member]    
With no related allowance recorded:    
Recorded investment, with no related allowance 4,064us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember		 5,093us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
Unpaid principal balance, with no related allowance 4,060us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember		 5,093us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
With an allowance recorded:    
Recorded investment, with related allowance 426us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember		 2,082us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
Unpaid principal balance, with related allowance 426us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember		 2,082us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
Related allowance 30us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember		 563us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
Total:    
Recorded investment 4,490us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember		 7,175us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
Unpaid principal balance 4,486us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember		 7,175us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
Related allowance 30us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember		 563us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
Consumer Installment [Member]    
With no related allowance recorded:    
Recorded investment, with no related allowance   6us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember
Unpaid principal balance, with no related allowance   6us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember
With an allowance recorded:    
Recorded investment, with related allowance 6us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember		  
Unpaid principal balance, with related allowance 6us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember		  
Related allowance 2us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember		  
Total:    
Recorded investment 6us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember		 6us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember
Unpaid principal balance 6us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember		 6us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember
Related allowance $ 2us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_ConsumerInstallmentMember