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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Cash flows from operating activities |  |
Net income | $ 6,646,000 us-gaap_NetIncomeLoss | $ 3,580,000 us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash from operating activities |  |
Depreciation and amortization | 2,833,000 us-gaap_DepreciationAmortizationAndAccretionNet | 512,000 us-gaap_DepreciationAmortizationAndAccretionNet
Accretion of acquired loans | (1,416,000)mbwm_DiscountAccretionOnAcquiredLoans | 0 mbwm_DiscountAccretionOnAcquiredLoans
Provision for loan losses | (400,000)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet | (1,900,000)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet
Stock-based compensation expense | 212,000 us-gaap_ShareBasedCompensation | 118,000 us-gaap_ShareBasedCompensation
Stock grants to directors for retainer fee | 123,000 us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims | 0 us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims
Proceeds from sales of mortgage loans held for sale | 23,970,000 us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale | 4,450,000 us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale
Origination of mortgage loans held for sale | (25,123,000)us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale | (4,979,000)us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale
Net gain from sales of mortgage loans held for sale | (703,000)us-gaap_GainLossOnSaleOfMortgageLoans | (52,000)us-gaap_GainLossOnSaleOfMortgageLoans
Net gain from sales and valuation write-down of foreclosed assets | (1,000)mbwm_NetGainLossFromSaleAndValuationWritedownOfForeclosedAssets | (276,000)mbwm_NetGainLossFromSaleAndValuationWritedownOfForeclosedAssets
Net gain from sales of fixed assets | (20,000)us-gaap_GainLossOnSaleOfPropertyPlantEquipment | 0 us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Net gain from sales of available for sale securities | (5,000)us-gaap_GainLossOnSaleOfSecuritiesNet | 0 us-gaap_GainLossOnSaleOfSecuritiesNet
Earnings on bank owned life insurance | (287,000)us-gaap_BankOwnedLifeInsuranceIncome | (290,000)us-gaap_BankOwnedLifeInsuranceIncome
Net change in: |  |
Accrued interest receivable | (713,000)us-gaap_IncreaseDecreaseInAccruedInterestReceivableNet | (212,000)us-gaap_IncreaseDecreaseInAccruedInterestReceivableNet
Other assets | 1,150,000 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | 611,000 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accrued interest and other liabilities | 1,540,000 us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities | (1,001,000)us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities
Net cash from operating activities | 7,806,000 us-gaap_NetCashProvidedByUsedInOperatingActivities | 561,000 us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities |  |
Loan originations and payments, net | (27,224,000)us-gaap_PaymentsForProceedsFromLoansAndLeases | (12,939,000)us-gaap_PaymentsForProceedsFromLoansAndLeases
Purchases of securities available for sale | (1,800,000)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (11,672,000)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Proceeds from maturities, calls and repayments of securities available for sale | 22,371,000 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities | 4,407,000 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Proceeds from sales of securities available for sale | 665,000 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 0 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Proceeds from sales of foreclosed assets | 754,000 us-gaap_ProceedsFromSaleOfForeclosedAssets | 777,000 us-gaap_ProceedsFromSaleOfForeclosedAssets
Purchases of premises and equipment | (288,000)us-gaap_PaymentsForProceedsFromProductiveAssets | (311,000)us-gaap_PaymentsForProceedsFromProductiveAssets
Net cash for investing activities | (5,522,000)us-gaap_NetCashProvidedByUsedInInvestingActivities | (19,738,000)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities |  |
Net decrease in time deposits | (40,457,000)us-gaap_IncreaseDecreaseInTimeDeposits | (14,142,000)us-gaap_IncreaseDecreaseInTimeDeposits
Net increase in all other deposits | 43,654,000 us-gaap_IncreaseDecreaseInOtherDeposits | 3,482,000 us-gaap_IncreaseDecreaseInOtherDeposits
Net decrease in securities sold under agreements to repurchase | (19,350,000)us-gaap_ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase | (6,140,000)us-gaap_ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase
Maturities of Federal Home Loan Bank advances | (6,000,000)us-gaap_RepaymentsOfFederalHomeLoanBankBorrowings | 0 us-gaap_RepaymentsOfFederalHomeLoanBankBorrowings
Proceeds from stock option exercises | 132,000 us-gaap_ProceedsFromStockOptionsExercised | 0 us-gaap_ProceedsFromStockOptionsExercised
Employee stock purchase plan | 10,000 us-gaap_ProceedsFromStockPlans | 0 us-gaap_ProceedsFromStockPlans
Dividend reinvestment plan | 140,000 us-gaap_ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan | 0 us-gaap_ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan
Repurchase of common stock shares | (1,984,000)us-gaap_PaymentsForRepurchaseOfCommonStock | 0 us-gaap_PaymentsForRepurchaseOfCommonStock
Payment of cash dividends to common shareholders | (2,377,000)us-gaap_PaymentsOfDividendsCommonStock | (1,041,000)us-gaap_PaymentsOfDividendsCommonStock
Net cash for financing activities | (26,232,000)us-gaap_NetCashProvidedByUsedInFinancingActivities | (17,841,000)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net change in cash and cash equivalents | (23,948,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (37,018,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period | 172,738,000 us-gaap_CashCashEquivalentsAndFederalFundsSold | 146,965,000 us-gaap_CashCashEquivalentsAndFederalFundsSold
Cash and cash equivalents at end of period | 148,790,000 us-gaap_CashCashEquivalentsAndFederalFundsSold | 109,947,000 us-gaap_CashCashEquivalentsAndFederalFundsSold
Cash paid during the period for: |  |
Interest | 2,903,000 us-gaap_InterestPaid | 3,134,000 us-gaap_InterestPaid
Federal income tax | 950,000 us-gaap_IncomeTaxesPaidNet | 0 us-gaap_IncomeTaxesPaidNet
Noncash financing and investing activities: |  |
Transfers from loans to foreclosed assets | $ 422,000 us-gaap_TransferToOtherRealEstate | $ 0 us-gaap_TransferToOtherRealEstate

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- Definition The net cash outflow or inflow for the increase (decrease) in the beginning and end of period of loan and lease balances which are not originated or purchased specifically for resale. Includes cash payments and proceeds associated with (a) loans held-for-investment, (b) leases held-for-investment, and (c) both. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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- Definition The net cash outflow or inflow from purchases, sales and disposals of property, plant and equipment and other productive assets, including intangibles. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 + Details
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- Definition The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26853-111562 + Details
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- Definition Amount of cash inflow from capital contributions to an entity associated with a dividend reinvestment plan. + References No definition available. + Details
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- Definition The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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- Definition The cash flow from investments sold under the agreement to repurchase such investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3098-108585 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the sale assets received in full or partial satisfaction of a receivable including real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts. Foreclosed assets also include loans that are treated as if the underlying collateral had been foreclosed because the institution has taken possession of the collateral, even though legal foreclosure or repossession proceedings have not taken place. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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- Definition The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3461-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the amount received from the stock plan during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 + Details
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- Definition The cash outflow for the payment of loan drawn from Federal Home Loan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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- Definition Value transferred from mortgage loans to real estate owned (REO) in noncash transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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