$MBWM
Mercantile Bank Corp Stock $mbwm

$mbwm Overview Financials Valuation SEC Filings Company Website

2022 Q1 Form 10-Q Financial Statement

#000143774922011234 Filed on May 06, 2022

Income Statement

Concept	2022 Q1	2021 Q1
Revenue	$35.88M	$34.79M
YoY Change	3.15%	-8.3%
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	$1.600M	$1.400M
YoY Change	14.29%	7.69%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$4.997M	$5.252M
YoY Change	-4.86%	-31.05%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$14.32M	$17.58M
YoY Change	-18.54%	33.41%
Income Tax	$2.828M	$3.340M
% Of Pretax Income	19.75%	19.0%
Net Earnings	$11.49M	$14.24M
YoY Change	-19.29%	33.41%
Net Earnings / Revenue	32.03%	40.93%
Basic Earnings Per Share	$0.73	$0.87
Diluted Earnings Per Share	$0.73	$0.87
COMMON SHARES
Basic Shares Outstanding	15.84M	16.28M
Diluted Shares Outstanding	15.84M	16.28M

Balance Sheet

Concept	2022 Q1	2021 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$770.2M
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	$56.08M	$55.39M
YoY Change	1.25%	-6.35%
Goodwill	$49.47M	$49.47M
YoY Change	0.0%	0.0%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets		$13.20M
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$5.176B	$4.710B
YoY Change	9.88%	28.79%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$37.20M	$23.80M
YoY Change	56.3%	23.32%
Accrued Expenses	$2.600M
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$204.3M	$141.3M
YoY Change	44.57%	6.0%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$39.80M	$23.80M
YoY Change	67.23%	23.32%
LONG-TERM LIABILITIES
Long-Term Debt	$136.8M	$47.70M
YoY Change	186.88%	1.27%
Other Long-Term Liabilities		$17.30M
YoY Change
Total Long-Term Liabilities	$136.8M	$65.00M
YoY Change	110.53%	38.0%
TOTAL LIABILITIES
Total Short-Term Liabilities	$39.80M	$23.80M
Total Long-Term Liabilities	$136.8M	$65.00M
Total Liabilities	$4.739B	$4.269B
YoY Change	11.02%	31.8%
SHAREHOLDERS EQUITY
Retained Earnings	$181.5M	$143.6M
YoY Change	26.38%	25.99%
Common Stock	$286.8M	$299.4M
YoY Change	-4.18%	-0.08%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$436.5M	$441.2M
YoY Change
Total Liabilities & Shareholders Equity	$5.176B	$4.710B
YoY Change	9.88%	28.79%

Cashflow Statement

Concept	2022 Q1	2021 Q1
OPERATING ACTIVITIES
Net Income	$11.49M	$14.24M
YoY Change	-19.29%	33.41%
Depreciation, Depletion And Amortization	$1.600M	$1.400M
YoY Change	14.29%	7.69%
Cash From Operating Activities	$27.89M	-$1.421M
YoY Change	-2062.56%	-85.47%
INVESTING ACTIVITIES
Capital Expenditures	-$332.0K	-$1.600M
YoY Change	-79.25%	-49.37%
Acquisitions
YoY Change
Other Investing Activities	-$150.8M	-$236.3M
YoY Change	-36.19%	-27263.22%
Cash From Investing Activities	-$151.1M	-$237.9M
YoY Change	-36.48%	10276.14%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$0.00	$3.538M
YoY Change	-100.0%	-43.68%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-$81.71M	$265.7M
YoY Change	-130.76%	1664.29%
NET CHANGE
Cash From Operating Activities	$27.89M	-$1.421M
Cash From Investing Activities	-$151.1M	-$237.9M
Cash From Financing Activities	-$81.71M	$265.7M
Net Change In Cash	-$205.0M	$26.34M
YoY Change	-878.18%	781.46%
FREE CASH FLOW
Cash From Operating Activities	$27.89M	-$1.421M
Capital Expenditures	-$332.0K	-$1.600M
Free Cash Flow	$28.22M	$179.0K
YoY Change	15665.36%	-102.7%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2022Q1	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	281
CY2022Q1	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	382263000	USD
CY2022Q1	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	5835
CY2022Q2	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	15843442
CY2022Q1	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2021Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2022Q1	us-gaap	Preferred Stock No Par Value PreferredStockNoParValue	0
CY2021Q4	us-gaap	Preferred Stock No Par Value PreferredStockNoParValue	0
CY2022Q1	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	1000000
CY2021Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	1000000
CY2022Q1	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2021Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2022Q1	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2022Q1	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	40000000
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	40000000
CY2022Q1	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	15843347
CY2021Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	15839944
CY2022Q1	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	1355
CY2022Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.31
CY2021Q1	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	331
CY2021Q1	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	6647
CY2021Q1	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	118261
CY2021Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.29
CY2022Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	USD
CY2022Q1	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	0	USD
CY2022Q1	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	0	USD
CY2022Q1	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	94557000	USD
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0470	pure
CY2021Q1	us-gaap	Operating Lease Expense OperatingLeaseExpense	200000	USD
CY2022Q1	us-gaap	Repurchase Agreement Counterparty Weighted Average Maturity Of Agreements1 RepurchaseAgreementCounterpartyWeightedAverageMaturityOfAgreements1	P1Y
CY2022Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.31
CY2022Q1	us-gaap	Cash And Due From Banks CashAndDueFromBanks	71480000	USD
CY2021Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	59405000	USD
CY2022Q1	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	698724000	USD
CY2021Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	915755000	USD
CY2022Q1	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	770204000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	975160000	USD
CY2022Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	605661000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	592743000	USD
CY2022Q1	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	17721000	USD
CY2021Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	18002000	USD
CY2022Q1	mbwm	Mortgage Loans Held For Sale MortgageLoansHeldForSale	14746000	USD
CY2021Q4	mbwm	Mortgage Loans Held For Sale MortgageLoansHeldForSale	16117000	USD
CY2022Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	3555790000	USD
CY2021Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	3453459000	USD
CY2022Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	35153000	USD
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	35363000	USD
CY2022Q1	us-gaap	Notes Receivable Net NotesReceivableNet	3520637000	USD
CY2021Q4	us-gaap	Notes Receivable Net NotesReceivableNet	3418096000	USD
CY2022Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	56078000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	57298000	USD
CY2022Q1	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	75508000	USD
CY2021Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	75242000	USD
CY2022Q1	us-gaap	Goodwill Goodwill	49473000	USD
CY2021Q4	us-gaap	Goodwill Goodwill	49473000	USD
CY2022Q1	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	1112000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	1351000	USD
CY2022Q1	us-gaap	Other Assets OtherAssets	64759000	USD
CY2021Q4	us-gaap	Other Assets OtherAssets	54267000	USD
CY2022Q1	us-gaap	Assets Assets	5175899000	USD
CY2021Q4	us-gaap	Assets Assets	5257749000	USD
CY2022Q1	us-gaap	Noninterest Bearing Domestic Deposit Demand NoninterestBearingDomesticDepositDemand	1686203000	USD
CY2021Q4	us-gaap	Noninterest Bearing Domestic Deposit Demand NoninterestBearingDomesticDepositDemand	1677952000	USD
CY2022Q1	us-gaap	Interest Bearing Deposit Liabilities Domestic InterestBearingDepositLiabilitiesDomestic	2290048000	USD
CY2021Q4	us-gaap	Interest Bearing Deposit Liabilities Domestic InterestBearingDepositLiabilitiesDomestic	2405241000	USD
CY2022Q1	us-gaap	Deposits Deposits	3976251000	USD
CY2021Q4	us-gaap	Deposits Deposits	4083193000	USD
CY2022Q1	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	204271000	USD
CY2021Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	197463000	USD
CY2022Q1	us-gaap	Junior Subordinated Notes JuniorSubordinatedNotes	88428000	USD
CY2022Q1	mbwm	Fees And Commissions Payroll Processing FeesAndCommissionsPayrollProcessing	638000	USD
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	374000000	USD
CY2022Q1	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	48415000	USD
CY2021Q1	mbwm	Fees And Commissions Payroll Processing FeesAndCommissionsPayrollProcessing	557000	USD
CY2021Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	48244000	USD
CY2022Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	30785000	USD
CY2021Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	29233000	USD
CY2022Q1	us-gaap	Fees And Commissions Mortgage Banking And Servicing FeesAndCommissionsMortgageBankingAndServicing	3281000	USD
CY2021Q1	us-gaap	Fees And Commissions Mortgage Banking And Servicing FeesAndCommissionsMortgageBankingAndServicing	8800000	USD
CY2022Q1	mbwm	Interest Rate Swap Program Fees InterestRateSwapProgramFees	1351000	USD
CY2021Q1	mbwm	Interest Rate Swap Program Fees InterestRateSwapProgramFees	653000	USD
CY2022Q1	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	287000	USD
CY2021Q1	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	277000	USD
CY2022Q1	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	423000	USD
CY2021Q1	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	343000	USD
CY2021Q4	us-gaap	Junior Subordinated Notes JuniorSubordinatedNotes	73646000	USD
CY2022Q1	us-gaap	Accrued Liabilities Current And Noncurrent AccruedLiabilitiesCurrentAndNoncurrent	39800000	USD
CY2021Q4	us-gaap	Accrued Liabilities Current And Noncurrent AccruedLiabilitiesCurrentAndNoncurrent	24644000	USD
CY2022Q1	us-gaap	Liabilities Liabilities	4739428000	USD
CY2021Q4	us-gaap	Liabilities Liabilities	4801190000	USD
CY2022Q1	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2021Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2022Q1	us-gaap	Common Stock Value CommonStockValue	286831000	USD
CY2021Q4	us-gaap	Common Stock Value CommonStockValue	285752000	USD
CY2022Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	181532000	USD
CY2021Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	174536000	USD
CY2022Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-31892000	USD
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-3729000	USD
CY2022Q1	us-gaap	Stockholders Equity StockholdersEquity	436471000	USD
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	456559000	USD
CY2022Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	5175899000	USD
CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	5257749000	USD
CY2022Q1	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	33251000	USD
CY2021Q1	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	32985000	USD
CY2022Q1	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	1665000	USD
CY2021Q1	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	1035000	USD
CY2022Q1	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	600000	USD
CY2021Q1	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	597000	USD
CY2022Q1	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	366000	USD
CY2021Q1	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	168000	USD
CY2022Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	35882000	USD
CY2021Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	34785000	USD
CY2022Q1	us-gaap	Interest Expense Deposits InterestExpenseDeposits	1825000	USD
CY2021Q1	us-gaap	Interest Expense Deposits InterestExpenseDeposits	2717000	USD
CY2022Q1	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	50000	USD
CY2021Q1	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	36000	USD
CY2022Q1	us-gaap	Interest Expense Federal Home Loan Bank And Federal Reserve Bank Advances Long Term InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm	1864000	USD
CY2021Q1	us-gaap	Interest Expense Federal Home Loan Bank And Federal Reserve Bank Advances Long Term InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm	2027000	USD
CY2022Q1	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	1258000	USD
CY2021Q1	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	472000	USD
CY2022Q1	us-gaap	Interest Expense InterestExpense	4997000	USD
CY2021Q1	us-gaap	Interest Expense InterestExpense	5252000	USD
CY2022Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	30885000	USD
CY2021Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	29533000	USD
CY2022Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	100000	USD
CY2021Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	300000	USD
CY2022Q1	us-gaap	Noninterest Income NoninterestIncome	9277000	USD
CY2021Q1	us-gaap	Noninterest Income NoninterestIncome	13463000	USD
CY2022Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	15510000	USD
CY2021Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	15086000	USD
CY2022Q1	us-gaap	Occupancy Net OccupancyNet	2104000	USD
CY2021Q1	us-gaap	Occupancy Net OccupancyNet	2014000	USD
CY2022Q1	us-gaap	Equipment Expense EquipmentExpense	934000	USD
CY2021Q1	us-gaap	Equipment Expense EquipmentExpense	889000	USD
CY2022Q1	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	2973000	USD
CY2021Q1	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	2617000	USD
CY2022Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	4221000	USD
CY2021Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	4511000	USD
CY2022Q1	us-gaap	Noninterest Expense NoninterestExpense	25742000	USD
CY2021Q1	us-gaap	Noninterest Expense NoninterestExpense	25117000	USD
CY2022Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	14320000	USD
CY2021Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	17579000	USD
CY2022Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2828000	USD
CY2021Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3340000	USD
CY2022Q1	us-gaap	Net Income Loss NetIncomeLoss	11492000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	14239000	USD
CY2022Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.73
CY2021Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.87
CY2022Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.73
CY2021Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.87
CY2022Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.31
CY2021Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.29
CY2022Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15840801
CY2021Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16283044
CY2022Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15841037
CY2021Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16283490
CY2022Q1	us-gaap	Net Income Loss NetIncomeLoss	11492000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	14239000	USD
CY2022Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-35650000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-9168000	USD
CY2022Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-7487000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-1925000	USD
CY2022Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-28163000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-7243000	USD
CY2022Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-16671000	USD
CY2021Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	6996000	USD
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	456559000	USD
CY2022Q1	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	10000	USD
CY2022Q1	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	222000	USD
CY2022Q1	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	36000	USD
CY2022Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	811000	USD
CY2022Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	4812000	USD
CY2022Q1	us-gaap	Net Income Loss NetIncomeLoss	11492000	USD
CY2022Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-28163000	USD
CY2022Q1	us-gaap	Stockholders Equity StockholdersEquity	436471000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	441554000	USD
CY2021Q1	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	11000	USD
CY2021Q1	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	213000	USD
CY2021Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	643000	USD
CY2021Q1	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	3538000	USD
CY2021Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	4636000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	14239000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-7243000	USD
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	441243000	USD
CY2022Q1	us-gaap	Net Income Loss NetIncomeLoss	11492000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	14239000	USD
CY2022Q1	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	3458000	USD
CY2021Q1	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	3457000	USD
CY2022Q1	mbwm	Discount Accretion On Acquired Loans DiscountAccretionOnAcquiredLoans	-0	USD
CY2021Q1	mbwm	Discount Accretion On Acquired Loans DiscountAccretionOnAcquiredLoans	34000	USD
CY2022Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	100000	USD
CY2021Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	300000	USD
CY2022Q1	us-gaap	Share Based Compensation ShareBasedCompensation	811000	USD
CY2021Q1	us-gaap	Share Based Compensation ShareBasedCompensation	643000	USD
CY2022Q1	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	79622000	USD
CY2021Q1	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	189018000	USD
CY2022Q1	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	75046000	USD
CY2021Q1	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	197245000	USD
CY2022Q1	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	3205000	USD
CY2021Q1	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	9182000	USD
CY2022Q1	mbwm	Net Gain Loss From Sale And Valuation Write Down Of Foreclosed Assets NetGainLossFromSaleAndValuationWriteDownOfForeclosedAssets	13000	USD
CY2021Q1	mbwm	Net Gain Loss From Sale And Valuation Write Down Of Foreclosed Assets NetGainLossFromSaleAndValuationWriteDownOfForeclosedAssets	81000	USD
CY2022Q1	mbwm	Net Gain Loss From Sale And Valuation Write Down Of Former Bank Premises NetGainLossFromSaleAndValuationWriteDownOfFormerBankPremises	-0	USD
CY2021Q1	mbwm	Net Gain Loss From Sale And Valuation Write Down Of Former Bank Premises NetGainLossFromSaleAndValuationWriteDownOfFormerBankPremises	-250000	USD
CY2022Q1	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	1000	USD
CY2021Q1	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-312000	USD
CY2022Q1	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	287000	USD
CY2021Q1	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	277000	USD
CY2022Q1	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	1344000	USD
CY2021Q1	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	971000	USD
CY2022Q1	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	2855000	USD
CY2021Q1	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	1367000	USD
CY2022Q1	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	15156000	USD
CY2021Q1	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	-483000	USD
CY2022Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	27888000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-1421000	USD
CY2022Q1	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	102241000	USD
CY2021Q1	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	180147000	USD
CY2022Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	51705000	USD
CY2021Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	87307000	USD
CY2022Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	2854000	USD
CY2021Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	30974000	USD
CY2022Q1	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	13000	USD
CY2021Q1	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	158000	USD
CY2022Q1	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	281000	USD
CY2021Q1	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	0	USD
CY2022Q1	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	332000	USD
CY2021Q1	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	1603000	USD
CY2022Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-151130000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-237925000	USD
CY2022Q1	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-35861000	USD
CY2021Q1	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-51961000	USD
CY2022Q1	us-gaap	Increase Decrease In Other Deposits IncreaseDecreaseInOtherDeposits	-71081000	USD
CY2021Q1	us-gaap	Increase Decrease In Other Deposits IncreaseDecreaseInOtherDeposits	302650000	USD
CY2022Q1	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	6808000	USD
CY2021Q1	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	22945000	USD
CY2022Q1	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	28263000	USD
CY2021Q1	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	0	USD
CY2022Q1	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	20000000	USD
CY2021Q1	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	-0	USD
CY2022Q1	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	10000	USD
CY2021Q1	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	11000	USD
CY2022Q1	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	36000	USD
CY2021Q1	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	0	USD
CY2022Q1	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	222000	USD
CY2021Q1	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	213000	USD
CY2022Q1	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	14701000	USD
CY2021Q1	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	0	USD
CY2022Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	-0	USD
CY2021Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	3538000	USD
CY2022Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	4812000	USD
CY2021Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	4636000	USD
CY2022Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-81714000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	265684000	USD
CY2022Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-204956000	USD
CY2021Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	26338000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	975160000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	626006000	USD
CY2022Q1	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	770204000	USD
CY2021Q1	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	652344000	USD
CY2022Q1	us-gaap	Interest Paid Net InterestPaidNet	4240000	USD
CY2021Q1	us-gaap	Interest Paid Net InterestPaidNet	5509000	USD
CY2022Q1	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	0	USD
CY2021Q1	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	9709000	USD
CY2022Q1	mbwm	Transfer Of Bank Premises To Assets Held For Sale TransferOfBankPremisesToAssetsHeldForSale	0	USD
CY2021Q1	mbwm	Transfer Of Bank Premises To Assets Held For Sale TransferOfBankPremisesToAssetsHeldForSale	3450000	USD
CY2022Q1	mbwm	Transfers From Deposits To Liabilities Held For Sale TransfersFromDepositsToLiabilitiesHeldForSale	0	USD
CY2021Q1	mbwm	Transfers From Deposits To Liabilities Held For Sale TransfersFromDepositsToLiabilitiesHeldForSale	17280000	USD
CY2022Q1	mbwm	Number Of Unconsolidated Business Trusts Formed To Issue Trust Preferred Securities NumberOfUnconsolidatedBusinessTrustsFormedToIssueTrustPreferredSecurities	5	pure
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	592743000	USD
CY2022Q1	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	3000000.0	USD
CY2022Q1	mbwm	Interest Income On Commercial And Mortgage Loans Discontinued Period InterestIncomeOnCommercialAndMortgageLoansDiscontinuedPeriod	P90D
CY2022Q1	mbwm	Maximum Delinquency Period For Consumer And Credit Card Loans To Be Charged Off MaximumDelinquencyPeriodForConsumerAndCreditCardLoansToBeChargedOff	P120D
CY2022Q1	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	15200000	USD
CY2021Q4	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	16700000	USD
CY2022Q1	us-gaap	Servicing Asset ServicingAsset	1360000000	USD
CY2021Q4	us-gaap	Servicing Asset ServicingAsset	1340000000	USD
CY2022Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	646031000	USD
CY2022Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	776000	USD
CY2022Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	41146000	USD
CY2022Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	605661000	USD
CY2021Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	597463000	USD
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	5238000	USD
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	9958000	USD
CY2021Q4	mbwm	Loan Portfolio Classes And Segments As Percentage Of Aggregate Loan LoanPortfolioClassesAndSegmentsAsPercentageOfAggregateLoan	1.000	pure
CY2022Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	3555790000	USD
CY2022Q1	mbwm	Loan Portfolio Classes And Segments As Percentage Of Aggregate Loan LoanPortfolioClassesAndSegmentsAsPercentageOfAggregateLoan	1.000	pure
CY2021Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	3453459000	USD
CY2022Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	646031000	USD
CY2022Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	605661000	USD
CY2022Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	3560000000	USD
CY2021Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	3450000000	USD
CY2022Q1	us-gaap	Increase Decrease In Finance Receivables IncreaseDecreaseInFinanceReceivables	102000000	USD
CY2022Q1	mbwm	Loans And Leases Receivable Percentage Period Increase Decrease LoansAndLeasesReceivablePercentagePeriodIncreaseDecrease	0.030	pure
CY2022Q1	mbwm	Loans And Leases Receivable Net Of Deferred Income Increase Decrease Percentage LoansAndLeasesReceivableNetOfDeferredIncomeIncreaseDecreasePercentage	0.030	pure
CY2022Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	293910000	USD
CY2022Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	18152000	USD
CY2022Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	240819000	USD
CY2022Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	22994000	USD
CY2022Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	534729000	USD
CY2022Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	41146000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	351062000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	6455000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	110491000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	3503000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	461553000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	9958000	USD
CY2022Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	527	pure
CY2022Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	535000000	USD
CY2022Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	41100000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	333	pure
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	462000000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	10000000.0	USD
CY2021Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	0	USD
CY2022Q1	mbwm	Weighted Average Yield Of Securities Portfolio Due In One Year Or Less WeightedAverageYieldOfSecuritiesPortfolioDueInOneYearOrLess	0.0198	pure
CY2022Q1	us-gaap	Available For Sale Securities Debt Maturities Remainder Of Fiscal Year Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRemainderOfFiscalYearAmortizedCostBasis	10171000	USD
CY2022Q1	us-gaap	Available For Sale Securities Debt Maturities Remainder Of Fiscal Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesRemainderOfFiscalYearFairValue	10171000	USD
CY2022Q1	mbwm	Weighted Average Yield Of Securities Portfolio Due From One To Five Years WeightedAverageYieldOfSecuritiesPortfolioDueFromOneToFiveYears	0.0111	pure
CY2022Q1	mbwm	Debt Securities Availableforsale Amortized Cost Maturity Allocated And Single Maturity Date Year One Through Five DebtSecuritiesAvailableforsaleAmortizedCostMaturityAllocatedAndSingleMaturityDateYearOneThroughFive	263429000	USD
CY2022Q1	mbwm	Debt Securities Availableforsale Fair Value Maturity Allocated And Single Maturity Date Year One Through Five DebtSecuritiesAvailableforsaleFairValueMaturityAllocatedAndSingleMaturityDateYearOneThroughFive	251105000	USD
CY2022Q1	mbwm	Weighted Average Yield Of Securities Portfolio Due From Five To Ten Years WeightedAverageYieldOfSecuritiesPortfolioDueFromFiveToTenYears	0.0174	pure
CY2022Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	295377000	USD
CY2022Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	273366000	USD
CY2022Q1	mbwm	Weighted Average Yield Of Securities Portfolio Due Afterten Years WeightedAverageYieldOfSecuritiesPortfolioDueAftertenYears	0.0213	pure
CY2022Q1	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	36339000	USD
CY2022Q1	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	32773000	USD
CY2022Q1	mbwm	Weighted Average Yield Of Securities Portfolio WeightedAverageYieldOfSecuritiesPortfolio	0.0152	pure
CY2022Q1	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	205000	USD
CY2022Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	3555790000	USD
CY2022Q1	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	0	USD
CY2021Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	3453459000	USD
CY2021Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	155000	USD
CY2022Q1	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	1587000	USD
CY2022Q1	mbwm	Financing Receivable Nonaccrual With Allowance FinancingReceivableNonaccrualWithAllowance	25000	USD
CY2022Q1	mbwm	Financing Receivable Nonaccrual Allowance FinancingReceivableNonaccrualAllowance	25000	USD
CY2022Q1	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	1612000	USD
CY2022Q1	mbwm	Financing Receivable Nonaccrual Allowance FinancingReceivableNonaccrualAllowance	25000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	16997000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	15715000	USD
CY2021Q1	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	22826000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	3671000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	3651000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	546000	USD
CY2021Q1	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	2069000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	20668000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	19366000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	546000	USD
CY2021Q1	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	24895000	USD
CY2021Q1	mbwm	Financing Receivable Accruing Trouble Debt Restructurings Interest Income FinancingReceivableAccruingTroubleDebtRestructuringsInterestIncome	400000	USD
CY2021Q1	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	0	USD
CY2022Q1	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	351252000	USD
CY2022Q1	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	1415927000	USD
CY2022Q1	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	715732000	USD
CY2022Q1	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	202169000	USD
CY2022Q1	us-gaap	Financing Receivable Originated Four Years Before Latest Fiscal Year FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	105403000	USD
CY2022Q1	us-gaap	Financing Receivable Originated Five Or More Years Before Latest Fiscal Year FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	165221000	USD
CY2022Q1	mbwm	Financing Receivable Term Loan FinancingReceivableTermLoan	2955704000	USD
CY2022Q1	us-gaap	Financing Receivable Revolving FinancingReceivableRevolving	600086000	USD
CY2022Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	3555790000	USD
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	35363000	USD
CY2022Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	100000	USD
CY2022Q1	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	295000	USD
CY2022Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	35153000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	37967000	USD
CY2021Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	300000	USD
CY2021Q1	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	52000	USD
CY2021Q1	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	480000	USD
CY2021Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	38695000	USD
CY2021Q1	mbwm	Loans Allowance For Credit Losses Individually Evaluated For Impairment LoansAllowanceForCreditLossesIndividuallyEvaluatedForImpairment	487000	USD
CY2021Q1	mbwm	Loans Allowance For Credit Losses Collectively Evaluated For Impairment LoansAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	38208000	USD
CY2021Q4	mbwm	Loans And Leases Receivable Net Of Deferred Income Excluding Ppp Loans LoansAndLeasesReceivableNetOfDeferredIncomeExcludingPPPLoans	3413349000	USD
CY2021Q4	mbwm	Loans Individually Evaluated For Impairment LoansIndividuallyEvaluatedForImpairment	19366000	USD
CY2021Q4	mbwm	Loans Collectively Evaluated For Impairment LoansCollectivelyEvaluatedForImpairment	3393983000	USD
CY2022Q1	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	2	pure
CY2022Q1	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	128000	USD
CY2022Q1	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	128000	USD
CY2021Q1	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	3	pure
CY2021Q1	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	130000	USD
CY2021Q1	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	129000	USD
CY2022Q1	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	pure
CY2022Q1	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	0	USD
CY2021Q1	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	3	pure
CY2021Q1	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	599000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	94253000	USD
CY2022Q1	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	38479000	USD
CY2021Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	36955000	USD
CY2022Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	56078000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	57298000	USD
CY2022Q1	us-gaap	Depreciation Depreciation	1600000	USD
CY2021Q1	us-gaap	Depreciation Depreciation	1400000	USD
CY2022Q1	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P2Y7M6D
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P2Y9M18D
CY2022Q1	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0470	pure
CY2022Q1	us-gaap	Operating Lease Expense OperatingLeaseExpense	200000	USD
CY2022Q1	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	3400000	USD
CY2022Q1	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	800000	USD
CY2022Q1	mbwm	Lessee Operating Lease Liability To Be Paid Year Two And Year Three LesseeOperatingLeaseLiabilityToBePaidYearTwoAndYearThree	1200000	USD
CY2022Q1	mbwm	Lessee Operating Lease Liability To Be Paid Year Four And Year Five LesseeOperatingLeaseLiabilityToBePaidYearFourAndYearFive	300000	USD
CY2022Q1	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	1100000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	3600000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	800000	USD
CY2021Q4	mbwm	Lessee Operating Lease Liability To Be Paid Year Two And Year Three LesseeOperatingLeaseLiabilityToBePaidYearTwoAndYearThree	1400000	USD
CY2021Q4	mbwm	Lessee Operating Lease Liability To Be Paid Year Four And Year Five LesseeOperatingLeaseLiabilityToBePaidYearFourAndYearFive	300000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	1100000	USD
CY2022Q1	us-gaap	Deposits Deposits	3980000000	USD
CY2022Q1	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-107000000	USD
CY2022Q1	mbwm	Aggregate Increase Decrease In Percentage Of Deposits AggregateIncreaseDecreaseInPercentageOfDeposits	-0.026	pure
CY2022Q1	us-gaap	Noninterest Bearing Domestic Deposit Demand NoninterestBearingDomesticDepositDemand	1686203000	USD
CY2022Q1	mbwm	Percentage Of Non Interest Bearing Domestic Deposits To Deposits Demand PercentageOfNonInterestBearingDomesticDepositsToDepositsDemand	0.424	pure
CY2021Q4	us-gaap	Noninterest Bearing Domestic Deposit Demand NoninterestBearingDomesticDepositDemand	1677952000	USD
CY2021Q4	mbwm	Percentage Of Non Interest Bearing Domestic Deposits To Deposits Demand PercentageOfNonInterestBearingDomesticDepositsToDepositsDemand	0.411	pure
CY2022Q1	mbwm	Percentage Of Increase Decrease In Non Interest Bearing Demand Deposits PercentageOfIncreaseDecreaseInNonInterestBearingDemandDeposits	0.005	pure
CY2022Q1	us-gaap	Interest Bearing Domestic Deposit Checking InterestBearingDomesticDepositChecking	544221000	USD
CY2022Q1	us-gaap	Percentage Of Interest Bearing Domestic Deposits To Deposits Checking PercentageOfInterestBearingDomesticDepositsToDepositsChecking	0.137	pure
CY2021Q4	us-gaap	Interest Bearing Domestic Deposit Checking InterestBearingDomesticDepositChecking	538838000	USD
CY2021Q4	us-gaap	Percentage Of Interest Bearing Domestic Deposits To Deposits Checking PercentageOfInterestBearingDomesticDepositsToDepositsChecking	0.132	pure
CY2022Q1	mbwm	Percentage Of Increase Decrease Of Interest Bearing Checking Deposits PercentageOfIncreaseDecreaseOfInterestBearingCheckingDeposits	0.010	pure
CY2022Q1	us-gaap	Interest Bearing Domestic Deposit Money Market InterestBearingDomesticDepositMoneyMarket	943246000	USD
CY2022Q1	us-gaap	Percentage Of Interest Bearing Domestic Deposits To Deposits Money Market PercentageOfInterestBearingDomesticDepositsToDepositsMoneyMarket	0.237	pure
CY2021Q4	us-gaap	Interest Bearing Domestic Deposit Money Market InterestBearingDomesticDepositMoneyMarket	1040176000	USD
CY2021Q4	us-gaap	Percentage Of Interest Bearing Domestic Deposits To Deposits Money Market PercentageOfInterestBearingDomesticDepositsToDepositsMoneyMarket	0.255	pure
CY2022Q1	mbwm	Percentage Of Increase Decrease In Money Market Deposits PercentageOfIncreaseDecreaseInMoneyMarketDeposits	-0.093	pure
CY2022Q1	us-gaap	Interest Bearing Domestic Deposit Savings InterestBearingDomesticDepositSavings	406545000	USD
CY2022Q1	us-gaap	Percentage Of Interest Bearing Domestic Deposits To Deposits Savings PercentageOfInterestBearingDomesticDepositsToDepositsSavings	0.102	pure
CY2021Q4	us-gaap	Interest Bearing Domestic Deposit Savings InterestBearingDomesticDepositSavings	394330000	USD
CY2021Q4	us-gaap	Percentage Of Interest Bearing Domestic Deposits To Deposits Savings PercentageOfInterestBearingDomesticDepositsToDepositsSavings	0.097	pure
CY2022Q1	mbwm	Percentage Of Increase Or Decrease Of Savings Deposits PercentageOfIncreaseOrDecreaseOfSavingsDeposits	0.031	pure
CY2022Q1	mbwm	Domestic Time Deposits Less Than100000 DomesticTimeDepositsLessThan100000	127755000	USD
CY2022Q1	mbwm	Percentage Of Domestic Time Deposits Under100000 PercentageOfDomesticTimeDepositsUnder100000	0.032	pure
CY2021Q4	mbwm	Domestic Time Deposits Less Than100000 DomesticTimeDepositsLessThan100000	132776000	USD
CY2021Q4	mbwm	Percentage Of Domestic Time Deposits Under100000 PercentageOfDomesticTimeDepositsUnder100000	0.032	pure
CY2022Q1	mbwm	Percentage Of Increase Decrease In Domestic Time Deposits Under100000 PercentageOfIncreaseDecreaseInDomesticTimeDepositsUnder100000	-0.038	pure
CY2022Q1	mbwm	Domestic Time Deposits100000 Or More DomesticTimeDeposits100000OrMore	252088000	USD
CY2022Q1	mbwm	Percentage Of Domestic Time Deposits100000 And Over PercentageOfDomesticTimeDeposits100000AndOver	0.064	pure
CY2021Q4	mbwm	Domestic Time Deposits100000 Or More DomesticTimeDeposits100000OrMore	275208000	USD
CY2021Q4	mbwm	Percentage Of Domestic Time Deposits100000 And Over PercentageOfDomesticTimeDeposits100000AndOver	0.067	pure
CY2022Q1	mbwm	Percentage Of Increase Decrease In Domestic Time Deposits100000 And Over PercentageOfIncreaseDecreaseInDomesticTimeDeposits100000AndOver	-0.084	pure
CY2022Q1	mbwm	Aggregate Local Deposit Liabilities AggregateLocalDepositLiabilities	3960058000	USD
CY2022Q1	mbwm	Aggregate Percentage Of Local Deposits AggregatePercentageOfLocalDeposits	0.996	pure
CY2021Q4	mbwm	Aggregate Local Deposit Liabilities AggregateLocalDepositLiabilities	4059280000	USD
CY2021Q4	mbwm	Aggregate Percentage Of Local Deposits AggregatePercentageOfLocalDeposits	0.994	pure
CY2022Q1	mbwm	Aggregate Percentage Increase Decrease In Local Deposits AggregatePercentageIncreaseDecreaseInLocalDeposits	-0.024	pure
CY2022Q1	mbwm	Out Of Area Time Deposits100000 And Over OutOfAreaTimeDeposits100000AndOver	16193000	USD
CY2022Q1	mbwm	Percentage Of Out Of Area Time Deposits100000 And Over PercentageOfOutOfAreaTimeDeposits100000AndOver	0.004	pure
CY2021Q4	mbwm	Out Of Area Time Deposits100000 And Over OutOfAreaTimeDeposits100000AndOver	23913000	USD
CY2021Q4	mbwm	Percentage Of Out Of Area Time Deposits100000 And Over PercentageOfOutOfAreaTimeDeposits100000AndOver	0.006	pure
CY2022Q1	mbwm	Percentage Of Increase Decrease In Out Of Area Time100000 And Over PercentageOfIncreaseDecreaseInOutOfAreaTime100000AndOver	-0.323	pure
CY2022Q1	us-gaap	Deposits Deposits	3976251000	USD
CY2022Q1	mbwm	Aggregate Percentage Of Deposits AggregatePercentageOfDeposits	1.000	pure
CY2021Q4	us-gaap	Deposits Deposits	4083193000	USD
CY2021Q4	mbwm	Aggregate Percentage Of Deposits AggregatePercentageOfDeposits	1.000	pure
CY2022Q1	mbwm	Aggregate Increase Decrease In Percentage Of Deposits AggregateIncreaseDecreaseInPercentageOfDeposits	-0.026	pure
CY2022Q1	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	181000000	USD
CY2021Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	207000000	USD
CY2022Q1	us-gaap	Schedule Of Repurchase Agreements ScheduleOfRepurchaseAgreements	<table border="0" cellpadding="0" cellspacing="0" class="finTable" style="margin-right: 5%; margin-left: 18pt; width: 95%; font-size: 10pt; font-family: Times New Roman; text-indent: 0px;"><tbody><tr style="vertical-align: bottom;"><td style="font-family: Times New Roman; font-size: 10pt;"> </td><td style="font-family: Times New Roman; font-size: 10pt;"> </td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">Three Months Ended</p> </td><td style="font-family: Times New Roman; font-size: 10pt;"> </td><td style="font-family: Times New Roman; font-size: 10pt;"> </td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">Twelve Months Ended</p> </td><td style="font-family: Times New Roman; font-size: 10pt;"> </td></tr> <tr style="vertical-align: bottom;"><td style="font-family: Times New Roman; font-size: 10pt;"> </td><td style="font-family: Times New Roman; font-size: 10pt;"> </td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">March 31, 2022</p> </td><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td><td style="font-family: Times New Roman; font-size: 10pt;"> </td><td colspan="2" style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">December 31, 2021</p> </td><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td></tr> <tr style="vertical-align: bottom;"><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> <tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt; width: 64%;"> <p style="font-family: "Times New Roman"; font-size: 10pt; font-variant: normal; margin: 0pt;">Outstanding balance at end of period</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 15%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">204,271,000</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 15%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">197,463,000</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"> </td></tr> <tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: "Times New Roman"; font-size: 10pt; font-variant: normal; margin: 0pt;">Average interest rate at end of period</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"> </td><td style="width: 15%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">0.10</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">%</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"> </td><td style="width: 15%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">0.11</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">%</p> </td></tr> <tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> <tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: "Times New Roman"; font-size: 10pt; font-variant: normal; margin: 0pt;">Average daily balance during the period</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 15%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">198,949,000</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 15%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">158,855,000</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"> </td></tr> <tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: "Times New Roman"; font-size: 10pt; font-variant: normal; margin: 0pt;">Average interest rate during the period</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"> </td><td style="width: 15%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">0.10</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">%</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"> </td><td style="width: 15%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">0.11</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;">%</p> </td></tr> <tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> <tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: Times New Roman; font-size: 10pt;"> <p style="font-family: "Times New Roman"; font-size: 10pt; font-variant: normal; margin: 0pt;">Maximum daily balance during the period</p> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 15%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">224,345,000</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt;"> </td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 15%; text-align: right; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;">209,093,000</td><td style="width: 1%; font-family: Times New Roman; font-size: 10pt; margin-left: 0pt;"> </td></tr> </tbody></table>
CY2022Q1	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	204271000	USD
CY2021Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	197463000	USD
CY2022Q1	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	198949000	USD
CY2021	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	158855000	USD
CY2022Q1	us-gaap	Shortterm Debt Maximum Amount Outstanding During Period ShorttermDebtMaximumAmountOutstandingDuringPeriod	224345000	USD
CY2021	us-gaap	Shortterm Debt Maximum Amount Outstanding During Period ShorttermDebtMaximumAmountOutstandingDuringPeriod	209093000	USD
CY2022Q1	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	932000000	USD
CY2022Q1	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	544000000	USD
CY2022Q1	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Amount Liability FairValueDisclosureOffbalanceSheetRisksAmountLiability	1540413000	USD
CY2021Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Amount Liability FairValueDisclosureOffbalanceSheetRisksAmountLiability	1565871000	USD
CY2022Q1	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	15200000	USD
CY2021Q4	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	16700000	USD
CY2022Q1	mbwm	Preferred Securities Of Subsidiary Trust PreferredSecuritiesOfSubsidiaryTrust	46300000	USD
CY2021Q4	mbwm	Preferred Securities Of Subsidiary Trust PreferredSecuritiesOfSubsidiaryTrust	46200000	USD
CY2022Q1	mbwm	Maximum Restricted Core Element Allowed In Tier One Capital Percent MaximumRestrictedCoreElementAllowedInTierOneCapitalPercent	0.25	pure
CY2009Q4	mbwm	Maximum Level Of Consolidated Aggregate Assets Allowing For Inclusion Of Trust Preferred Securities In Tier One Capital MaximumLevelOfConsolidatedAggregateAssetsAllowingForInclusionOfTrustPreferredSecuritiesInTierOneCapital	15000000000.0	USD
CY2022Q1	mbwm	Trust Preferred Securities Included In Tier One Capital TrustPreferredSecuritiesIncludedInTierOneCapital	46300000	USD
CY2021Q4	mbwm	Trust Preferred Securities Included In Tier One Capital TrustPreferredSecuritiesIncludedInTierOneCapital	46200000	USD
CY2022Q1	mbwm	Capital Conservation Buffer CapitalConservationBuffer	0.025	pure
CY2022Q1	mbwm	Common Equity Tier1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets CommonEquityTier1RiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.070	pure
CY2022Q1	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.085	pure
CY2022Q1	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.105	pure
CY2022Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.31
CY2022Q1	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	6800000	USD
CY2021Q2	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	20000000.0	USD
CY2022Q1	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	0

Files In Submission

Name	View Source	Status
0001437749-22-011234-index-headers.html	Edgar Link	pending
0001437749-22-011234-index.html	Edgar Link	pending
0001437749-22-011234.txt	Edgar Link	pending
0001437749-22-011234-xbrl.zip	Edgar Link	pending
ex_368061.htm	Edgar Link	pending
ex_368062.htm	Edgar Link	pending
ex_368063.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
mbwm-20220331.xsd	Edgar Link	pending
mbwm-20220331_cal.xml	Edgar Link	unprocessable
mbwm-20220331_def.xml	Edgar Link	unprocessable
mbwm-20220331_lab.xml	Edgar Link	unprocessable
mbwm-20220331_pre.xml	Edgar Link	unprocessable
mbwm20220331_10q.htm	Edgar Link	pending
mbwm20220331_10q_htm.xml	Edgar Link	completed
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
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$MBWM
Mercantile Bank Corp Stock $mbwm

2022 Q1 Form 10-Q Financial Statement

#000143774922011234 Filed on May 06, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MBWM Mercantile Bank Corp Stock $mbwm

2022 Q1 Form 10-Q Financial Statement

#000143774922011234 Filed on May 06, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MBWM
Mercantile Bank Corp Stock $mbwm