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Note 2 - Business Combination (Details) - Acquired Loans Fair Value (Firstbank Corporation [Member], USD $) | Jun. 01, 2014
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Commercial Loans: |
Loans | $ 943,662,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue
Commercial and Industrial [Member] | Nonperforming Financing Receivable [Member] |
Commercial Loans: |
Loans | 878,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = mbwm_CommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember
Commercial and Industrial [Member] | Performing Financing Receivable [Member] |
Commercial Loans: |
Loans | 163,316,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = mbwm_CommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember
Commercial and Industrial [Member] |
Commercial Loans: |
Loans | 164,194,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = mbwm_CommercialAndIndustrialMember
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financing Receivable [Member] |
Commercial Loans: |
Loans | 12,973,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember
Commercial Real Estate Portfolio Segment [Member] | Performing Financing Receivable [Member] |
Commercial Loans: |
Loans | 378,016,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember
Commercial Real Estate Portfolio Segment [Member] |
Commercial Loans: |
Loans | 390,989,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate Construction Financing Receivable [Member] | Nonperforming Financing Receivable [Member] |
Commercial Loans: |
Loans | 1,289,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember
Commercial Real Estate Construction Financing Receivable [Member] | Performing Financing Receivable [Member] |
Commercial Loans: |
Loans | 33,726,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember
Commercial Real Estate Construction Financing Receivable [Member] |
Commercial Loans: |
Loans | 35,015,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Commercial Portfolio Segment [Member] | Nonperforming Financing Receivable [Member] |
Commercial Loans: |
Loans | 15,140,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember
Commercial Portfolio Segment [Member] | Performing Financing Receivable [Member] |
Commercial Loans: |
Loans | 575,058,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember
Commercial Portfolio Segment [Member] |
Commercial Loans: |
Loans | 590,198,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Residential Portfolio Segment [Member] | Nonperforming Financing Receivable [Member] |
Commercial Loans: |
Loans | 9,694,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember
Residential Portfolio Segment [Member] | Performing Financing Receivable [Member] |
Commercial Loans: |
Loans | 216,653,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember
Residential Portfolio Segment [Member] |
Commercial Loans: |
Loans | 226,347,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Consumer Installment Portfolio Segment [Member] | Nonperforming Financing Receivable [Member] |
Commercial Loans: |
Loans | 167,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = mbwm_ConsumerInstallmentPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember
Consumer Installment Portfolio Segment [Member] | Performing Financing Receivable [Member] |
Commercial Loans: |
Loans | 61,657,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = mbwm_ConsumerInstallmentPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember
Consumer Installment Portfolio Segment [Member] |
Commercial Loans: |
Loans | 61,824,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = mbwm_ConsumerInstallmentPortfolioSegmentMember
Consumer Home Equity Line Portfolio Segment [Member] | Nonperforming Financing Receivable [Member] |
Commercial Loans: |
Loans | 288,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = mbwm_ConsumerHomeEquityLinePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember
Consumer Home Equity Line Portfolio Segment [Member] | Performing Financing Receivable [Member] |
Commercial Loans: |
Loans | 52,054,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = mbwm_ConsumerHomeEquityLinePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember
Consumer Home Equity Line Portfolio Segment [Member] |
Commercial Loans: |
Loans | 52,342,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = mbwm_ConsumerHomeEquityLinePortfolioSegmentMember
Consumer Construction Portfolio Segment [Member] | Nonperforming Financing Receivable [Member] |
Commercial Loans: |
Loans | 76,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = mbwm_ConsumerConstructionPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember
Consumer Construction Portfolio Segment [Member] | Performing Financing Receivable [Member] |
Commercial Loans: |
Loans | 12,875,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = mbwm_ConsumerConstructionPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember
Consumer Construction Portfolio Segment [Member] |
Commercial Loans: |
Loans | 12,951,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = mbwm_ConsumerConstructionPortfolioSegmentMember
Consumer Portfolio Segment [Member] | Nonperforming Financing Receivable [Member] |
Commercial Loans: |
Loans | 10,225,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember
Consumer Portfolio Segment [Member] | Performing Financing Receivable [Member] |
Commercial Loans: |
Loans | 343,239,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember
Consumer Portfolio Segment [Member] |
Commercial Loans: |
Loans | 353,464,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Nonperforming Financing Receivable [Member] |
Commercial Loans: |
Loans | 25,365,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember
Performing Financing Receivable [Member] |
Commercial Loans: |
Loans | $ 918,297,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = mbwm_FirstbankCorporationMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember

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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the fair value of the receivables acquired, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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