XML 66 R54.htm IDEA: XBRL DOCUMENT
v3.21.2

Note 9 - Risks and Uncertainties (Details Textual) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Payment Protection Plan, Loan Forgiveness | $ 129,800 |
Loans and Leases Receivable, Net of Deferred Income, Total | $ 1,010,282 | $ 1,104,085
Payroll Protection Plan, Number of Loan Applications Approved | 683 |
Payment Protection Plan, Amount to be Funded | $ 67,600 |
Paycheck Protection Program, Deferred Fees Received | $ 3,000 |
Financing Receivable, Number of Principal and Interest Payments and Extension of Maturity Date Payment Deferrals | 3 | 11
Financing Receivable, Principal and Interest Payments and Extension of Maturity Date Payment Deferrals | $ 9,700 | $ 24,500
Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member] |  |
Proceeds from Sale of Debt Securities, Available-for-sale | 67,600 |
Loans and Leases Receivable, Net of Deferred Income, Total | $ 54,200 |

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 deferred fees received under the Paycheck Protection Program. + References No definition available. + Details
Name: | mbcn_PaycheckProtectionProgramDeferredFeesReceived
Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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 Amount of loans forgiven under the payment protection plan. + References No definition available. + Details
Name: | mbcn_PaymentProtectionPlanLoanForgiveness
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

X
- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524 + Details
Name: | us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3151-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis=mbcn_SmallBusinessAdministrationSBACARESActPaycheckProtectionProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |