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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

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X

- Definition

The amount of principal and interest payment and extension of maturity date payment deferrals on financing receivable.

+ References

No definition available.

+ Details

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Namespace Prefix:	mbcn_
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X

- Definition

The amount of deferred fees received under the Paycheck Protection Program.

+ References

No definition available.

+ Details

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Namespace Prefix:	mbcn_
Data Type:	xbrli:monetaryItemType
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X

- Definition

The amount of loans to be funded under the Payment Protection Plan.

+ References

No definition available.

+ Details

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X

- Definition

Amount of loans forgiven under the payment protection plan.

+ References

No definition available.

+ Details

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X

- Definition

The number of loan applications approved under the Payroll Protection Plan.

+ References

No definition available.

+ Details

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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

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-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524

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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

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-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

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-Topic 230
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-Section 45
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-Subparagraph (a)
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- Details

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