$MBCN
MIDDLEFIELD BANC CORP Stock $mbcn

$mbcn Overview Financials Valuation SEC Filings Company Website

2023 Q1 Form 10-K Financial Statement

#000143774923006727 Filed on March 15, 2023

Income Statement

Concept	2023 Q1	2022 Q4	2022
Revenue	$20.30M		$54.91M
YoY Change	65.57%		4.91%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$740.0K	$592.0K	$1.300M
YoY Change	60.17%	-4.52%	-7.14%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$3.798M		$4.729M
YoY Change	377.74%		16.33%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$5.885M	$4.153M	$18.89M
YoY Change	27.8%	-29.18%	-16.76%
Income Tax	$989.0K	$651.0K	$3.220M
% Of Pretax Income	16.81%	15.68%	17.04%
Net Earnings	$4.896M	$3.502M	$15.67M
YoY Change	27.73%	-27.6%	-15.89%
Net Earnings / Revenue	24.11%		28.55%
Basic Earnings Per Share	$0.60		$2.60
Diluted Earnings Per Share	$0.60	$0.53	$2.59
COMMON SHARES
Basic Shares Outstanding	8.089M	5.768M	6.027M
Diluted Shares Outstanding	8.153M		6.044M

Balance Sheet

Concept	2023 Q1	2022 Q4	2022
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$66.66M	$53.81M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$21.78M	$21.96M	$21.96M
YoY Change	27.03%	27.15%	21.33%
Goodwill	$31.74M	$31.70M
YoY Change	110.57%	110.34%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets			$9.454M
YoY Change			456.12%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$1.728B	$1.688B	$1.688B
YoY Change	30.57%	26.8%	26.8%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$10.10M	$10.90M	$878.0K
YoY Change	83.64%	75.81%	339.0%
Accrued Expenses		$723.0K	$5.163M
YoY Change			66.55%
Deferred Revenue
YoY Change
Short-Term Debt		$65.00M	$65.00M
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$10.10M	$723.0K	$6.041M
YoY Change	83.64%	-88.34%	83.06%
LONG-TERM LIABILITIES
Long-Term Debt	$12.01M	$12.06M	$12.06M
YoY Change	-7.44%	-6.52%	-6.52%
Other Long-Term Liabilities	$10.06M	$10.91M	$10.91M
YoY Change	82.62%	76.02%	289.75%
Total Long-Term Liabilities	$22.07M	$22.97M	$22.97M
YoY Change	19.4%	20.27%	46.32%
TOTAL LIABILITIES
Total Short-Term Liabilities	$10.10M	$723.0K	$6.041M
Total Long-Term Liabilities	$22.07M	$22.97M	$22.97M
Total Liabilities	$1.533B	$1.490B	$1.490B
YoY Change	29.27%	25.67%	25.66%
SHAREHOLDERS EQUITY
Retained Earnings	$93.02M	$94.15M
YoY Change	7.17%	12.13%
Common Stock	$161.2M	$161.0M
YoY Change	84.15%	84.81%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$39.85M	$35.35M
YoY Change	32.63%	20.93%
Treasury Stock Shares		$1.671M
Shareholders Equity	$195.2M	$197.7M	$197.7M
YoY Change
Total Liabilities & Shareholders Equity	$1.728B	$1.688B	$1.688B
YoY Change	30.57%	26.8%	26.8%

Cashflow Statement

Concept	2023 Q1	2022 Q4	2022
OPERATING ACTIVITIES
Net Income	$4.896M	$3.502M	$15.67M
YoY Change	27.73%	-27.6%	-15.89%
Depreciation, Depletion And Amortization	$740.0K	$592.0K	$1.300M
YoY Change	60.17%	-4.52%	-7.14%
Cash From Operating Activities	$6.438M	$5.888M	$18.36M
YoY Change	161.49%	42.22%	19.06%
INVESTING ACTIVITIES
Capital Expenditures	$263.0K	$248.0K	$884.0K
YoY Change	286.76%	-230.53%	46.12%
Acquisitions			-$18.41M
YoY Change
Other Investing Activities	-$30.76M	$32.06M	-$7.770M
YoY Change	150.28%	41.8%	-110.87%
Cash From Investing Activities	-$31.02M	$31.81M	-$8.654M
YoY Change	151.04%	41.83%	-112.21%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$6.119M
YoY Change			-50.22%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	$37.43M	-112.5M	-$75.39M
YoY Change	-2931.16%	185.31%	-4.84%
NET CHANGE
Cash From Operating Activities	$6.438M	5.888M	$18.36M
Cash From Investing Activities	-$31.02M	31.81M	-$8.654M
Cash From Financing Activities	$37.43M	-112.5M	-$75.39M
Net Change In Cash	$12.85M	-74.77M	-$65.69M
YoY Change	-214.55%	481.85%	-1028.15%
FREE CASH FLOW
Cash From Operating Activities	$6.438M	$5.888M	$18.36M
Capital Expenditures	$263.0K	$248.0K	$884.0K
Free Cash Flow	$6.175M	$5.640M	$17.48M
YoY Change	157.94%	30.25%	17.96%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2022	dei	Entity Central Index Key EntityCentralIndexKey	0000836147
CY2022	dei	Document Type DocumentType	10-K
CY2022	dei	Document Annual Report DocumentAnnualReport	true
CY2022	dei	Document Period End Date DocumentPeriodEndDate	2022-12-31
CY2022	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2022	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2022	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2022
CY2022	dei	Document Transition Report DocumentTransitionReport	false
CY2022	dei	Entity File Number EntityFileNumber	001-36613
CY2022	dei	Entity Registrant Name EntityRegistrantName	Middlefield Banc Corp.
CY2022	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	OH
CY2022	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	34-1585111
CY2022	dei	Entity Address Address Line1 EntityAddressAddressLine1	15985 East High Street
CY2022	dei	Entity Address City Or Town EntityAddressCityOrTown	Middlefield
CY2022	dei	Entity Address State Or Province EntityAddressStateOrProvince	OH
CY2022	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	44062-0035
CY2022	dei	City Area Code CityAreaCode	440
CY2022	dei	Local Phone Number LocalPhoneNumber	632-1666
CY2022	dei	Trading Symbol TradingSymbol	MBCN
CY2022	dei	Security12b Title Security12bTitle	Common Stock, Without Par Value
CY2022	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2022	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2022	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2022	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2022	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2022	dei	Entity Filer Category EntityFilerCategory	Non-accelerated Filer
CY2022	dei	Entity Small Business EntitySmallBusiness	true
CY2022	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
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CY2022	dei	Entity Shell Company EntityShellCompany	false
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CY2022	dei	Auditor Name AuditorName	S. R. Snodgrass, P.C.
CY2022	dei	Auditor Location AuditorLocation	Cranberry Township, Pennsylvania
CY2022	dei	Auditor Firm AuditorFirmId	74
CY2022	dei	Auditor Firm AuditorFirmId	74
CY2022	dei	Auditor Firm AuditorFirmId	74
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CY2021	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	54000	usd
CY2022	us-gaap	Noncash Merger Related Costs NoncashMergerRelatedCosts	2382000	usd
CY2021	us-gaap	Noncash Merger Related Costs NoncashMergerRelatedCosts	0	usd
CY2022	us-gaap	Other Noninterest Expense OtherNoninterestExpense	4851000	usd
CY2021	us-gaap	Other Noninterest Expense OtherNoninterestExpense	3561000	usd
CY2022	us-gaap	Noninterest Expense NoninterestExpense	38030000	usd
CY2021	us-gaap	Noninterest Expense NoninterestExpense	31991000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	18893000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	22698000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3220000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4065000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	15673000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	18633000	usd
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.60
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.01
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.59
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.00
CY2022	us-gaap	Net Income Loss NetIncomeLoss	15673000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	18633000	usd
CY2022	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-32413000	usd
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-1041000	usd
CY2022	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-6807000	usd
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-219000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-25606000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-822000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-9933000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	17811000	usd
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	143810000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	18633000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-822000	usd
CY2021	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	94000	usd
CY2021	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	151000	usd
CY2021	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	12291000	usd
CY2021	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	4240000	usd
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	145335000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	15673000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-25606000	usd
CY2022	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	73265000	usd
CY2022	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	633000	usd
CY2022	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	6119000	usd
CY2022	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	5490000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	197691000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	15673000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	18633000	usd
CY2022	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	0	usd
CY2021	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	700000	usd
CY2022	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-173000	usd
CY2021	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	209000	usd
CY2022	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	1330000	usd
CY2021	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	1420000	usd
CY2022	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	143000	usd
CY2021	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	361000	usd
CY2022	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	176000	usd
CY2021	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	313000	usd
CY2022	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-624000	usd
CY2021	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-506000	usd
CY2022	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	1804000	usd
CY2021	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	4780000	usd
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	372000	usd
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	321000	usd
CY2022	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	307000	usd
CY2021	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	478000	usd
CY2022	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	1350000	usd
CY2021	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	34081000	usd
CY2022	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	1641000	usd
CY2021	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	35148000	usd
CY2022	mbcn	Gain Loss On Sales Of Loans Excluding Student Loans Net GainLossOnSalesOfLoansExcludingStudentLoansNet	24000	usd
CY2021	mbcn	Gain Loss On Sales Of Loans Excluding Student Loans Net GainLossOnSalesOfLoansExcludingStudentLoansNet	1240000	usd
CY2022	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	459000	usd
CY2021	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	546000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-324000	usd
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-401000	usd
CY2022	mbcn	Gains Losses On Sales Of Other Real Estate Gross GainsLossesOnSalesOfOtherRealEstateGross	-0	usd
CY2021	mbcn	Gains Losses On Sales Of Other Real Estate Gross GainsLossesOnSalesOfOtherRealEstateGross	43000	usd
CY2022	mbcn	Other Real Estate Owned Writedowns OtherRealEstateOwnedWritedowns	1200000	usd
CY2021	mbcn	Other Real Estate Owned Writedowns OtherRealEstateOwnedWritedowns	0	usd
CY2022	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	209000	usd
CY2021	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-1078000	usd
CY2022	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	395000	usd
CY2021	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-343000	usd
CY2022	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-498000	usd
CY2021	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	1893000	usd
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	18362000	usd
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	15422000	usd
CY2022	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	4235000	usd
CY2021	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	11521000	usd
CY2022	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	57887000	usd
CY2021	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	0	usd
CY2022	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	32290000	usd
CY2021	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	68907000	usd
CY2022	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	55908000	usd
CY2021	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-127294000	usd
CY2022	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	0	usd
CY2021	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	501000	usd
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	884000	usd
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	605000	usd
CY2022	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	165000	usd
CY2021	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	0	usd
CY2022	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	1448000	usd
CY2021	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	-0	usd
CY2022	mbcn	Redemption Of Restricted Stock RedemptionOfRestrictedStock	1183000	usd
CY2021	mbcn	Redemption Of Restricted Stock RedemptionOfRestrictedStock	658000	usd
CY2022	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	0	usd
CY2021	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	424000	usd
CY2022	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-18406000	usd
CY2021	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-0	usd
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-8654000	usd
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	70886000	usd
CY2022	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-128553000	usd
CY2021	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-58590000	usd
CY2022	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	65000000	usd
CY2021	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	0	usd
CY2022	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	231000	usd
CY2021	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	4204000	usd
CY2022	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	0	usd
CY2021	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	94000	usd
CY2022	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	6119000	usd
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	12291000	usd
CY2022	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	5490000	usd
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	4240000	usd
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-75393000	usd
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-79231000	usd
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-65685000	usd
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	7077000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	119494000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	112417000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	53809000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	119494000	usd
CY2022	us-gaap	Interest Paid Net InterestPaidNet	4334000	usd
CY2021	us-gaap	Interest Paid Net InterestPaidNet	4408000	usd
CY2022	us-gaap	Income Taxes Paid IncomeTaxesPaid	3579000	usd
CY2021	us-gaap	Income Taxes Paid IncomeTaxesPaid	5526000	usd
CY2022	us-gaap	Stock Issued1 StockIssued1	73265000	usd
CY2021	us-gaap	Stock Issued1 StockIssued1	0	usd
CY2022	mbcn	Transfer Of Loans Heldforsale To Loans Held For Investment TransferOfLoansHeldforsaleToLoansHeldForInvestment	-784000	usd
CY2021	mbcn	Transfer Of Loans Heldforsale To Loans Held For Investment TransferOfLoansHeldforsaleToLoansHeldForInvestment	63000	usd
CY2022	mbcn	Increase Decrease In Finance Lease Assets Added To Premises And Equipment Noncash Investing Transactions IncreaseDecreaseInFinanceLeaseAssetsAddedToPremisesAndEquipmentNoncashInvestingTransactions	611000	usd
CY2021	mbcn	Increase Decrease In Finance Lease Assets Added To Premises And Equipment Noncash Investing Transactions IncreaseDecreaseInFinanceLeaseAssetsAddedToPremisesAndEquipmentNoncashInvestingTransactions	-67000	usd
CY2022	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	29000	usd
CY2021	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	0	usd
CY2022Q4	mbcn	Increase Decrease In Finance Lease Liabilities Added To Borrowed Funds Noncash Financing Transactions IncreaseDecreaseInFinanceLeaseLiabilitiesAddedToBorrowedFundsNoncashFinancingTransactions	-611000	usd
CY2021Q4	mbcn	Increase Decrease In Finance Lease Liabilities Added To Borrowed Funds Noncash Financing Transactions IncreaseDecreaseInFinanceLeaseLiabilitiesAddedToBorrowedFundsNoncashFinancingTransactions	67000	usd
CY2022Q4	mbcn	Number Of Branches NumberOfBranches	22	pure
CY2022	mbcn	Revenue From Interest Income And Noninterest Income Percent RevenueFromInterestIncomeAndNoninterestIncomePercent	0.896	pure
CY2021Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	818000	usd
CY2022	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-173000	usd
CY2021	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	209000	usd
CY2022	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	0	usd
CY2022Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	94800000	usd
CY2021Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	105900000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	52000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	28083000	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	164967000	usd
CY2021Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	165817000	usd
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	4922000	usd
CY2022	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2022Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	68000	usd
CY2021Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	1000000.0	usd
CY2022	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	1200000	usd
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	540000	usd
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	170199000	usd
CY2022Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	915000	usd
CY2022Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	1671231
CY2022	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	229420
CY2021Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	1441811
CY2022	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><b><span style="text-decoration: underline; ">Reclassification of Comparative Amounts</span></b></p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;">Certain comparative amounts for prior years have been reclassified to conform to current-year presentations. Such reclassifications did <em style="font: inherit;">not</em> affect net income or retained earnings.</p>
CY2022	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-173000	usd
CY2021	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	209000	usd
CY2022	mbcn	Gains Losses On Sales Of Other Real Estate Gross GainsLossesOnSalesOfOtherRealEstateGross	0	usd
CY2021	mbcn	Gains Losses On Sales Of Other Real Estate Gross GainsLossesOnSalesOfOtherRealEstateGross	43000	usd
CY2022	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	459000	usd
CY2021	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	546000	usd
CY2022	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	24000	usd
CY2021	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	1240000	usd
CY2022	us-gaap	Investment Banking Advisory Brokerage And Underwriting Fees And Commissions InvestmentBankingAdvisoryBrokerageAndUnderwritingFeesAndCommissions	674000	usd
CY2021	us-gaap	Investment Banking Advisory Brokerage And Underwriting Fees And Commissions InvestmentBankingAdvisoryBrokerageAndUnderwritingFeesAndCommissions	727000	usd
CY2022	mbcn	Miscellaneous Fee Income MiscellaneousFeeIncome	299000	usd
CY2021	mbcn	Miscellaneous Fee Income MiscellaneousFeeIncome	276000	usd
CY2022	us-gaap	Rental Income Nonoperating RentalIncomeNonoperating	951000	usd
CY2021	us-gaap	Rental Income Nonoperating RentalIncomeNonoperating	180000	usd
CY2022	us-gaap	Noninterest Income Other NoninterestIncomeOther	662000	usd
CY2021	us-gaap	Noninterest Income Other NoninterestIncomeOther	603000	usd
CY2022	us-gaap	Noninterest Income NoninterestIncome	6746000	usd
CY2021	us-gaap	Noninterest Income NoninterestIncome	7249000	usd
CY2022	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	7551769
CY2021	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	7325449
CY2022	us-gaap	Weighted Average Number Of Shares Treasury Stock WeightedAverageNumberOfSharesTreasuryStock	1524678
CY2021	us-gaap	Weighted Average Number Of Shares Treasury Stock WeightedAverageNumberOfSharesTreasuryStock	1138783
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	6027091
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	6186666
CY2022	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	17291
CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	24410
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	6044382
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	6211076
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	0
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	0
CY2022Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	192998000	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	1125000	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	1126000	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	3004000	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	2904000	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	45363000	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	42881000	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	143506000	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	118056000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	192998000	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	164967000	usd
CY2022	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	57900000	usd
CY2022	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	0	usd
CY2021	mbcn	Proceeds From Sale Of Investment Securities ProceedsFromSaleOfInvestmentSecurities	0	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	94134000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	12097000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	51244000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	15986000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	145378000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	28083000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	33423000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	441000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	2711000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	99000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	36134000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	540000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	141	pure
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	60	pure
CY2022Q4	mbcn	Percentage Of Portfolio PercentageOfPortfolio	0.817	pure
CY2022Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	22315000	usd
CY2022Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	1324489000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	1352872000	usd
CY2021Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	7969000	usd
CY2021Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	973722000	usd
CY2021Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	981691000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	2000000.0	usd
CY2021Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	3600000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	689000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	13749000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	14438000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	740000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	13602000	usd
CY2021Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	14342000	usd
CY2022Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	6451000	usd
CY2022Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	6612000	usd
CY2022Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	15864000	usd
CY2022Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	15864000	usd
CY2022Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	689000	usd
CY2022Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	22315000	usd
CY2022Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	22476000	usd
CY2022Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	689000	usd
CY2021Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	2744000	usd
CY2021Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	3221000	usd
CY2021Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	5225000	usd
CY2021Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	5765000	usd
CY2021Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	740000	usd
CY2021Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	7969000	usd
CY2021Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	8986000	usd
CY2021Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	740000	usd
CY2022Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	3300000	usd
CY2021Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	2600000	usd
CY2022	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	72000	usd
CY2021	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	150000	usd
CY2021Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	0	usd
CY2022	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Additions CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions	1900000	usd
CY2022	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	30000	usd
CY2022Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	1930000	usd
CY2022	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	13884000	usd
CY2022	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	1080000	usd
CY2021	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	8573000	usd
CY2021	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	445000	usd
CY2022	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2		pure
CY2022	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	1252000	usd
CY2022	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	1252000	usd
CY2021	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2		pure
CY2021	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	826000	usd
CY2021	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	826000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	1352872000	usd
CY2021Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	981691000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	1352872000	usd
CY2021Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	981691000	usd
CY2022Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	2111000	usd
CY2022Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	0	usd
CY2021Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	4859000	usd
CY2021Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	0	usd
CY2022Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	0	usd
CY2022	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	125000	usd
CY2021	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	204000	usd
CY2021Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	14342000	usd
CY2022	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	446000	usd
CY2022	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	542000	usd
CY2022	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	0	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	14438000	usd
CY2020Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	13459000	usd
CY2021	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	465000	usd
CY2021	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	648000	usd
CY2021	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	700000	usd
CY2021Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	14342000	usd
CY2021Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	542000	usd
CY2020Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	476000	usd
CY2022	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	19000	usd
CY2022Q4	us-gaap	Land And Land Improvements LandAndLandImprovements	4896000	usd
CY2021Q4	us-gaap	Land And Land Improvements LandAndLandImprovements	2963000	usd
CY2022Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	20537000	usd
CY2021Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	16531000	usd
CY2022Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	9485000	usd
CY2021Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	9596000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	38621000	usd
CY2021Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	33581000	usd
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	16660000	usd
CY2021Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	16309000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	21961000	usd
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	17272000	usd
CY2022	us-gaap	Depreciation Depreciation	1300000	usd
CY2021	us-gaap	Depreciation Depreciation	1400000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	31700000	usd
CY2021Q4	us-gaap	Goodwill Goodwill	15100000	usd
CY2022Q4	us-gaap	Finite Lived Core Deposits Gross FiniteLivedCoreDepositsGross	7700000	usd
CY2021Q4	us-gaap	Finite Lived Core Deposits Gross FiniteLivedCoreDepositsGross	1400000	usd
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	372000	usd
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	321000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	1059000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	1031000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	998000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	968000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	691000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	7701000	usd
CY2021	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	257000	usd
CY2022	us-gaap	Servicing Asset At Amortized Value Amortization1 ServicingAssetAtAmortizedValueAmortization1	169000	usd
CY2021	us-gaap	Servicing Asset At Amortized Value Amortization1 ServicingAssetAtAmortizedValueAmortization1	191000	usd
CY2022Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	2072000	usd
CY2021Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	542000	usd
CY2022Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	5777000	usd
CY2021Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	4399000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	9454000	usd
CY2021Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	1693000	usd
CY2022Q4	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	6676000	usd
CY2021Q4	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	3201000	usd
CY2022Q4	us-gaap	Other Assets OtherAssets	28528000	usd
CY2021Q4	us-gaap	Other Assets OtherAssets	14297000	usd
CY2022Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	50900000	usd
CY2021Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	33400000	usd
CY2022Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	136767000	usd
CY2022Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	85780000	usd
CY2022Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	6665000	usd
CY2022Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	5331000	usd
CY2022Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	3477000	usd
CY2022Q4	us-gaap	Time Deposits TimeDeposits	238020000	usd
CY2022Q4	mbcn	Contractual Maturities Time Deposits250000 Or More Three Months Or Less ContractualMaturitiesTimeDeposits250000OrMoreThreeMonthsOrLess	9807000	usd
CY2022Q4	mbcn	Percent Of Time Deposits250000 Or More Three Months Or Less PercentOfTimeDeposits250000OrMoreThreeMonthsOrLess	0.1926	pure
CY2022Q4	mbcn	Contractual Maturities Time Deposits250000 Or More Three Months Through Six Months ContractualMaturitiesTimeDeposits250000OrMoreThreeMonthsThroughSixMonths	5094000	usd
CY2022Q4	mbcn	Percent Of Time Deposits250000 Or More Three Months Through Six Months PercentOfTimeDeposits250000OrMoreThreeMonthsThroughSixMonths	0.1000	pure
CY2022Q4	mbcn	Contractual Maturities Time Deposits250000 Or More Six Months Through12 Months ContractualMaturitiesTimeDeposits250000OrMoreSixMonthsThrough12Months	11166000	usd
CY2022Q4	mbcn	Percent Of Time Deposits250000 Or More Six Months Through12 Months PercentOfTimeDeposits250000OrMoreSixMonthsThrough12Months	0.2193	pure
CY2022Q4	mbcn	Contractual Maturities Time Deposits250000 Or More After12 Months ContractualMaturitiesTimeDeposits250000OrMoreAfter12Months	24850000	usd
CY2022Q4	mbcn	Percent Of Time Deposits250000 Or More After12 Months PercentOfTimeDeposits250000OrMoreAfter12Months	0.4881	pure
CY2022Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	50917000	usd
CY2022Q4	mbcn	Percent Of Time Deposits250000 Or More PercentOfTimeDeposits250000OrMore	1.0000	pure
CY2022Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	24100000	usd
CY2021Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	29200000	usd
CY2022Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	65000000	usd
CY2021Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	0	usd
CY2022	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	8576000	usd
CY2021	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	85000	usd
CY2022	us-gaap	Shortterm Debt Maximum Monthend Outstanding Amount ShorttermDebtMaximumMonthendOutstandingAmount	80000000	usd
CY2021	us-gaap	Shortterm Debt Maximum Monthend Outstanding Amount ShorttermDebtMaximumMonthendOutstandingAmount	0	usd
CY2022Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0438	pure
CY2022	us-gaap	Short Term Debt Weighted Average Interest Rate Over Time ShortTermDebtWeightedAverageInterestRateOverTime	0.0358	pure
CY2021	us-gaap	Short Term Debt Weighted Average Interest Rate Over Time ShortTermDebtWeightedAverageInterestRateOverTime	0.0040	pure
CY2022Q4	us-gaap	Line Of Credit LineOfCredit	0	usd
CY2022Q4	mbcn	Federal Home Loan Bank Advances Additional Borrowing Capacity FederalHomeLoanBankAdvancesAdditionalBorrowingCapacity	380800000	usd
CY2021Q4	mbcn	Federal Home Loan Bank Advances Additional Borrowing Capacity FederalHomeLoanBankAdvancesAdditionalBorrowingCapacity	417400000	usd
CY2022Q4	us-gaap	Other Borrowings OtherBorrowings	12059000	usd
CY2021Q4	us-gaap	Other Borrowings OtherBorrowings	12901000	usd
CY2022Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	196000	usd
CY2022Q4	mbcn	Long Term Debt Maturities Next Twelve Months Weighted Average Rate LongTermDebtMaturitiesNextTwelveMonthsWeightedAverageRate	0.0301	pure
CY2022Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	202000	usd
CY2022Q4	mbcn	Long Term Debt Maturities Year Two Weighted Average Rate LongTermDebtMaturitiesYearTwoWeightedAverageRate	0.0301	pure
CY2022Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	214000	usd
CY2022Q4	mbcn	Long Term Debt Maturities Year Three Weighted Average Rate LongTermDebtMaturitiesYearThreeWeightedAverageRate	0.0301	pure
CY2022Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	227000	usd
CY2022Q4	mbcn	Long Term Debt Maturities Year Four Weighted Average Rate LongTermDebtMaturitiesYearFourWeightedAverageRate	0.0301	pure
CY2022Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	234000	usd
CY2022Q4	mbcn	Long Term Debt Maturities Year Five Weighted Average Rate LongTermDebtMaturitiesYearFiveWeightedAverageRate	0.0301	pure
CY2022Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	10986000	usd
CY2022Q4	mbcn	Long Term Debt Maturities After Year Five Weighted Average Rate LongTermDebtMaturitiesAfterYearFiveWeightedAverageRate	0.0479	pure
CY2022Q4	us-gaap	Other Borrowings OtherBorrowings	12059000	usd
CY2022Q4	mbcn	Other Borrowings Weighted Average Rate OtherBorrowingsWeightedAverageRate	0.0474	pure
CY2022Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	380800000	usd
CY2022Q4	mbcn	Irrevocable Letter Of Credit Municipal Deposits IrrevocableLetterOfCreditMunicipalDeposits	64000000.0	usd
CY2006Q4	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	248000	usd
CY2022Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	3800000	usd
CY2022Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	878000	usd
CY2021Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	237000	usd
CY2022Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Current And Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesCurrentAndNoncurrent	4440000	usd
CY2021Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Current And Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesCurrentAndNoncurrent	2247000	usd
CY2022Q4	us-gaap	Employee Related Liabilities Current And Noncurrent EmployeeRelatedLiabilitiesCurrentAndNoncurrent	1942000	usd
CY2021Q4	us-gaap	Employee Related Liabilities Current And Noncurrent EmployeeRelatedLiabilitiesCurrentAndNoncurrent	1631000	usd
CY2022Q4	us-gaap	Other Accrued Liabilities Current And Noncurrent OtherAccruedLiabilitiesCurrentAndNoncurrent	2930000	usd
CY2021Q4	us-gaap	Other Accrued Liabilities Current And Noncurrent OtherAccruedLiabilitiesCurrentAndNoncurrent	1167000	usd
CY2022Q4	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	10913000	usd
CY2021Q4	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	6160000	usd
CY2022	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	3544000	usd
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	4466000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-324000	usd
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-401000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3220000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4065000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	2921000	usd
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	3012000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	932000	usd
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	608000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	18000	usd
CY2021Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	18000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense DeferredTaxAssetsTaxDeferredExpense	319000	usd
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense DeferredTaxAssetsTaxDeferredExpense	350000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	328000	usd
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	293000	usd
CY2022Q4	mbcn	Deferred Tax Assets Deferred Origination Fees DeferredTaxAssetsDeferredOriginationFees	26000	usd
CY2021Q4	mbcn	Deferred Tax Assets Deferred Origination Fees DeferredTaxAssetsDeferredOriginationFees	0	usd
CY2022Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	5886000	usd
CY2021Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	0	usd
CY2022Q4	mbcn	Deferred Tax Assets Lease Liability DeferredTaxAssetsLeaseLiability	952000	usd
CY2021Q4	mbcn	Deferred Tax Assets Lease Liability DeferredTaxAssetsLeaseLiability	1161000	usd
CY2022Q4	mbcn	Deferred Tax Assets Acquisition Fair Value Adjustments DeferredTaxAssetsAcquisitionFairValueAdjustments	728000	usd
CY2021Q4	mbcn	Deferred Tax Assets Acquisition Fair Value Adjustments DeferredTaxAssetsAcquisitionFairValueAdjustments	0	usd
CY2022Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	366000	usd
CY2021Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	0	usd
CY2022Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	252000	usd
CY2021Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	0	usd
CY2022Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	12728000	usd
CY2021Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	5442000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1123000	usd
CY2021Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	632000	usd
CY2022Q4	mbcn	Deferred Tax Liabilities Unrealized Gain On Availableforsale Securities DeferredTaxLiabilitiesUnrealizedGainOnAvailableforsaleSecurities	0	usd
CY2021Q4	mbcn	Deferred Tax Liabilities Unrealized Gain On Availableforsale Securities DeferredTaxLiabilitiesUnrealizedGainOnAvailableforsaleSecurities	920000	usd
CY2022Q4	mbcn	Deferred Tax Liabilities Unrealized Gain On Equity Securities DeferredTaxLiabilitiesUnrealizedGainOnEquitySecurities	48000	usd
CY2021Q4	mbcn	Deferred Tax Liabilities Unrealized Gain On Equity Securities DeferredTaxLiabilitiesUnrealizedGainOnEquitySecurities	85000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Tax Deferred Income DeferredTaxLiabilitiesTaxDeferredIncome	242000	usd
CY2021Q4	us-gaap	Deferred Tax Liabilities Tax Deferred Income DeferredTaxLiabilitiesTaxDeferredIncome	139000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	474000	usd
CY2021Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	450000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	435000	usd
CY2021Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	114000	usd
CY2022Q4	mbcn	Deferred Tax Liabilities Deferred Origination Fees DeferredTaxLiabilitiesDeferredOriginationFees	0	usd
CY2021Q4	mbcn	Deferred Tax Liabilities Deferred Origination Fees DeferredTaxLiabilitiesDeferredOriginationFees	34000	usd
CY2022Q4	mbcn	Deferred Tax Liabilities Acquisition Fair Value Adjustments DeferredTaxLiabilitiesAcquisitionFairValueAdjustments	0	usd
CY2021Q4	mbcn	Deferred Tax Liabilities Acquisition Fair Value Adjustments DeferredTaxLiabilitiesAcquisitionFairValueAdjustments	249000	usd
CY2022Q4	mbcn	Deferred Tax Liabilities Rightof Use Assets DeferredTaxLiabilitiesRightofUseAssets	928000	usd
CY2021Q4	mbcn	Deferred Tax Liabilities Rightof Use Assets DeferredTaxLiabilitiesRightofUseAssets	1126000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	24000	usd
CY2021Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	0	usd
CY2022Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	3274000	usd
CY2021Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	3749000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	9454000	usd
CY2021Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	1693000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0	usd
CY2022	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	3967000	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210	pure
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	4766000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210	pure
CY2022	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	893000	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	-0.047	pure
CY2021	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	703000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	-0.031	pure
CY2022	mbcn	Effective Income Tax Rate Reconciliation Nondeductible Expense Interest Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpenseInterestExpense	-5000	usd
CY2022	mbcn	Effective Income Tax Rate Reconciliation Nondeductible Expense Interest Expense Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseInterestExpensePercent	0	pure
CY2021	mbcn	Effective Income Tax Rate Reconciliation Nondeductible Expense Interest Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpenseInterestExpense	-0	usd
CY2021	mbcn	Effective Income Tax Rate Reconciliation Nondeductible Expense Interest Expense Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseInterestExpensePercent	0	pure
CY2022	mbcn	Effective Income Tax Rate Reconciliation Nondeductible Expense Acquisition Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpenseAcquisitionExpense	-175000	usd
CY2022	mbcn	Effective Income Tax Rate Reconciliation Nondeductible Expense Acquisition Costs Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseAcquisitionCostsPercent	0.009	pure
CY2021	mbcn	Effective Income Tax Rate Reconciliation Nondeductible Expense Acquisition Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpenseAcquisitionExpense	-0	usd
CY2021	mbcn	Effective Income Tax Rate Reconciliation Nondeductible Expense Acquisition Costs Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseAcquisitionCostsPercent	0	pure
CY2022	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-34000	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.002	pure
CY2021	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	2000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0	pure
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3220000	usd
CY2022	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.170	pure
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4065000	usd
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.179	pure
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	usd
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	390839
CY2022	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	0
CY2022	us-gaap	Lease Cost LeaseCost	528000	usd
CY2021	us-gaap	Lease Cost LeaseCost	731000	usd
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	12150
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	8.78
CY2021	mbcn	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercises In Period For Stock And Cash SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisesInPeriodForStockAndCash	12150
CY2021	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	8.78
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	0
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	0
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	0
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	0
CY2021	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	12150
CY2022	mbcn	Sharebased Compensation Arrangement By Sharebased Payment Award Award Vesting Rights Average Total Shareholder Annual Return Percentage SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsAverageTotalShareholderAnnualReturnPercentage	0.10	pure
CY2022	mbcn	Sharebased Compensation Arrangement By Sharebased Payment Award Award Vesting Rights Capped Total Shareholder Annual Return Percentage SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsCappedTotalShareholderAnnualReturnPercentage	1.25	pure
CY2022Q4	us-gaap	Deferred Compensation Sharebased Arrangements Liability Current And Noncurrent DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent	693000	usd
CY2021Q4	us-gaap	Deferred Compensation Sharebased Arrangements Liability Current And Noncurrent DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent	979000	usd
CY2022Q4	us-gaap	Other Commitment OtherCommitment	444233000	usd
CY2021Q4	us-gaap	Other Commitment OtherCommitment	280965000	usd
CY2022Q4	mbcn	Number Of Branch Locations By Utilized Leases NumberOfBranchLocationsByUtilizedLeases	6	pure
CY2022Q4	mbcn	Number Of Production Offices By Utilized Leases NumberOfProductionOfficesByUtilizedLeases	1	pure
CY2022	mbcn	Lease Rightofuse Asset Net LeaseRightofuseAssetNet	4400000	usd
CY2022	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	176000	usd
CY2021	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	313000	usd
CY2022	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	116000	usd
CY2021	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	130000	usd
CY2022	mbcn	Finance Lease Other Cost FinanceLeaseOtherCost	30000	usd
CY2021	mbcn	Finance Lease Other Cost FinanceLeaseOtherCost	63000	usd
CY2022	us-gaap	Operating Lease Cost OperatingLeaseCost	206000	usd
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	225000	usd
CY2022Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P5Y
CY2022Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P15Y7M6D
CY2022Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.019	pure
CY2022Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.030	pure
CY2022Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	169000	usd
CY2022Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	308000	usd
CY2022Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	169000	usd
CY2022Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	308000	usd
CY2022Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	169000	usd
CY2022Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	314000	usd
CY2022Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	134000	usd
CY2022Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	320000	usd
CY2022Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	27000	usd
CY2022Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	320000	usd
CY2022Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	95000	usd
CY2022Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	3207000	usd
CY2022Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	763000	usd
CY2022Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	4777000	usd
CY2022Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	40000	usd
CY2022Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	966000	usd
CY2022Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	3811000	usd
CY2022Q4	mbcn	Reserves Required By Federal Reserve Bank ReservesRequiredByFederalReserveBank	0	usd
CY2022Q4	mbcn	Percent Of Common Stock PercentOfCommonStock	0.10	pure
CY2022Q4	mbcn	Amount Available For Payment Of Dividends AmountAvailableForPaymentOfDividends	7000000.0	usd
CY2022Q4	mbcn	Mandatorily Redeemable Securities MandatorilyRedeemableSecurities	8200000	usd
CY2021Q4	mbcn	Mandatorily Redeemable Securities MandatorilyRedeemableSecurities	8000000.0	usd
CY2022Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.0400	pure
CY2022Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0600	pure
CY2022Q4	mbcn	Common Equity Tier1 Capital Required For Capital Adequacy To Risk Weighted Assets CommonEquityTier1CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0450	pure
CY2022Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0800	pure
CY2022Q4	mbcn	Tier One Leverage Capital Required For Capital Adequacy Plus Conservation Buffer To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyPlusConservationBufferToAverageAssets	0.0400	pure
CY2022Q4	mbcn	Tier One Risk Based Capital Required For Capital Adequacy Plus Capital Conservation Buffer To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyPlusCapitalConservationBufferToRiskWeightedAssets	0.0850	pure
CY2022Q4	mbcn	Common Equity Tier1 Capital Required For Capital Adequacy Plus Capital Conservation Buffer CommonEquityTier1CapitalRequiredForCapitalAdequacyPlusCapitalConservationBuffer	0.0700	pure
CY2022Q4	mbcn	Capital Required For Capital Adequacy Plus Capital Conservation Buffer To Risk Weighted Assets CapitalRequiredForCapitalAdequacyPlusCapitalConservationBufferToRiskWeightedAssets	0.1050	pure
CY2021Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.0400	pure
CY2021Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0600	pure
CY2021Q4	mbcn	Common Equity Tier1 Capital Required For Capital Adequacy To Risk Weighted Assets CommonEquityTier1CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0450	pure
CY2021Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0800	pure
CY2021Q4	mbcn	Tier One Leverage Capital Required For Capital Adequacy Plus Conservation Buffer To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyPlusConservationBufferToAverageAssets	0.0400	pure
CY2021Q4	mbcn	Tier One Risk Based Capital Required For Capital Adequacy Plus Capital Conservation Buffer To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyPlusCapitalConservationBufferToRiskWeightedAssets	0.0850	pure
CY2021Q4	mbcn	Common Equity Tier1 Capital Required For Capital Adequacy Plus Capital Conservation Buffer CommonEquityTier1CapitalRequiredForCapitalAdequacyPlusCapitalConservationBuffer	0.0700	pure
CY2021Q4	mbcn	Capital Required For Capital Adequacy Plus Capital Conservation Buffer To Risk Weighted Assets CapitalRequiredForCapitalAdequacyPlusCapitalConservationBufferToRiskWeightedAssets	0.1050	pure
CY2022	mbcn	Estimated Selling Costs Of Impaired Loans EstimatedSellingCostsOfImpairedLoans	688000	usd
CY2021	mbcn	Estimated Selling Costs Of Impaired Loans EstimatedSellingCostsOfImpairedLoans	901000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	0	usd
CY2022Q4	us-gaap	Secured Debt SecuredDebt	8248000	usd
CY2021Q4	us-gaap	Secured Debt SecuredDebt	8248000	usd

Files In Submission

Name	View Source	Status
mbcn-20221231_def.xml	Edgar Link	unprocessable
FilingSummary.xml	Edgar Link	unprocessable
mbcn-20221231_cal.xml	Edgar Link	unprocessable
0001437749-23-006727-index-headers.html	Edgar Link	pending
0001437749-23-006727-index.html	Edgar Link	pending
0001437749-23-006727.txt	Edgar Link	pending
0001437749-23-006727-xbrl.zip	Edgar Link	pending
ex_487328.htm	Edgar Link	pending
ex_487329.htm	Edgar Link	pending
ex_487330.htm	Edgar Link	pending
ex_487331.htm	Edgar Link	pending
ex_487332.htm	Edgar Link	pending
ex_487333.htm	Edgar Link	pending
ex_487334.htm	Edgar Link	pending
ex_487334img001.jpg	Edgar Link	pending
ex_487335.htm	Edgar Link	pending
ex_487336.htm	Edgar Link	pending
ex_487337.htm	Edgar Link	pending
ex_487533.htm	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
image01.jpg	Edgar Link	pending
image02.jpg	Edgar Link	pending
m01.jpg	Edgar Link	pending
m02.jpg	Edgar Link	pending
mbclogosm.jpg	Edgar Link	pending
mbcn-20221231.xsd	Edgar Link	pending
mbcn20221231_10k.htm	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
pic10.jpg	Edgar Link	pending
pic11.jpg	Edgar Link	pending
pic3.jpg	Edgar Link	pending
pic4.jpg	Edgar Link	pending
pic5.jpg	Edgar Link	pending
pic6.jpg	Edgar Link	pending
pic7.jpg	Edgar Link	pending
pic9.jpg	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R100.htm	Edgar Link	pending
mbcn-20221231_lab.xml	Edgar Link	unprocessable
mbcn-20221231_pre.xml	Edgar Link	unprocessable
mbcn20221231_10k_htm.xml	Edgar Link	completed
R101.htm	Edgar Link	pending
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$MBCN
MIDDLEFIELD BANC CORP Stock $mbcn

2023 Q1 Form 10-K Financial Statement

#000143774923006727 Filed on March 15, 2023

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

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$MBCN MIDDLEFIELD BANC CORP Stock $mbcn

2023 Q1 Form 10-K Financial Statement

#000143774923006727 Filed on March 15, 2023

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MBCN
MIDDLEFIELD BANC CORP Stock $mbcn