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v3.20.2

Note 10 - Risks and Uncertainties (Details Textual) $ in Millions | Jun. 30, 2020 USD ($)
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Payroll Protection Plan, Number of Loan Applications Approved | 1,343
Payment Protection Plan, Amount to be Funded | $ 142.7
Financing Receivable, Number of Principal and Interest Payments and Extension of Maturity Date Payment Deferrals | 362
Financing Receivable, Principal and Interest Payments and Extension of Maturity Date Payment Deferrals | $ 214.8

X
- Definition The number of principal and interest payments and extension of maturity date payment deferrals on financing receivable. + References No definition available. + Details
Name: | mbcn_FinancingReceivableNumberOfPrincipalAndInterestAndExtensionOfMaturityDatePaymentDeferrals
Namespace Prefix: | mbcn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of principal and interest payment and extension of maturity date payment deferrals on financing receivable. + References No definition available. + Details
Name: | mbcn_FinancingReceivablePrincipalAndInterestPaymentsAndExtensionOfMaturityDatePaymentDeferrals
Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of loans to be funded under the Payment Protection Plan. + References No definition available. + Details
Name: | mbcn_PaymentProtectionPlanAmountToBeFunded
Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The number of loan applications approved under the Payroll Protection Plan. + References No definition available. + Details
Name: | mbcn_PayrollProtectionPlanNumberOfLoanApplicationsApproved
Namespace Prefix: | mbcn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant