XML 58 R48.htm IDEA: XBRL DOCUMENT
v3.4.0.3

Note 3 - Loans and Allowance for Loan Losses (Details) - Activity for Troubled Debt Restructurings - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member] |  |
Commercial Loan Portfolio: |  |
Beginning Balance | $ 2,028,000 | $ 7,026,000
Ending Balance | 1,946,000 | 6,556,000
Charge-Offs | 0 | 0
Payments | (101,000) | (1,155,000)
Transfers to ORE | 0 | 0
Net Additions/Deletions | 19,000 | 685,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] |  |
Commercial Loan Portfolio: |  |
Beginning Balance | 2,086,000 | 2,680,000
Ending Balance | 2,062,000 | 2,654,000
Charge-Offs | 0 | 0
Payments | (24,000) | (26,000)
Transfers to ORE | 0 | 0
Net Additions/Deletions | 0 | 0
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Owner Occupied Loan [Member] |  |
Commercial Loan Portfolio: |  |
Beginning Balance | 1,400,000 | 17,160,000
Ending Balance | 1,369,000 | 16,966,000
Charge-Offs | 0 | 0
Payments | (31,000) | (194,000)
Transfers to ORE | 0 | 0
Net Additions/Deletions | 0 | 0
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member] |  |
Commercial Loan Portfolio: |  |
Beginning Balance | 10,657,000 | 17,439,000
Ending Balance | 10,529,000 | 16,063,000
Charge-Offs | 0 | 0
Payments | (128,000) | (1,376,000)
Transfers to ORE | 0 | 0
Net Additions/Deletions | 0 | 0
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member] |  |
Commercial Loan Portfolio: |  |
Beginning Balance | 476,000 | 505,000
Ending Balance | 469,000 | 498,000
Charge-Offs | 0 | 0
Payments | (7,000) | (7,000)
Transfers to ORE | 0 | 0
Net Additions/Deletions | 0 | 0
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member] |  |
Commercial Loan Portfolio: |  |
Beginning Balance | 1,686,000 | 1,439,000
Ending Balance | 1,687,000 | 1,519,000
Charge-Offs | (48,000) | 0
Payments | 0 | 0
Transfers to ORE | 0 | 0
Net Additions/Deletions | 49,000 | 80,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] |  |
Commercial Loan Portfolio: |  |
Beginning Balance | 0 | 0
Ending Balance | 0 | 0
Charge-Offs | 0 | 0
Payments | 0 | 0
Transfers to ORE | 0 | 0
Net Additions/Deletions | 0 | 0
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Owner Occupied Loan [Member] |  |
Commercial Loan Portfolio: |  |
Beginning Balance | 1,652,000 | 1,569,000
Ending Balance | 1,455,000 | 1,492,000
Charge-Offs | 0 | 0
Payments | (197,000) | (179,000)
Transfers to ORE | 0 | 0
Net Additions/Deletions | 0 | 102,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member] |  |
Commercial Loan Portfolio: |  |
Beginning Balance | 647,000 | 64,000
Ending Balance | 637,000 | 62,000
Charge-Offs | 0 | 0
Payments | (10,000) | (2,000)
Transfers to ORE | 0 | 0
Net Additions/Deletions | 0 | 0
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member] |  |
Commercial Loan Portfolio: |  |
Beginning Balance | 331,000 | 381,000
Ending Balance | 278,000 | 333,000
Charge-Offs | 0 | 0
Payments | (53,000) | (48,000)
Transfers to ORE | 0 | 0
Net Additions/Deletions | 0 | 0
Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member] |  |
Commercial Loan Portfolio: |  |
Beginning Balance | 146,000 | 0
Ending Balance | 146,000 | 0
Charge-Offs | 0 | 0
Payments | 0 | 0
Transfers to ORE | 0 | 0
Net Additions/Deletions | 0 | 0
Retail Portfolio Segment [Member] | Originated Loan [Member] | 1-4 Family Mortgages [Member] |  |
Commercial Loan Portfolio: |  |
Beginning Balance | 128,000 | 1,967,000
Ending Balance | 126,000 | 302,000
Charge-Offs | 0 | (125,000)
Payments | (2,000) | (1,540,000)
Transfers to ORE | 0 | 0
Net Additions/Deletions | 0 | 0
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member] |  |
Commercial Loan Portfolio: |  |
Beginning Balance | 141,000 | 26,000
Ending Balance | 161,000 | 0
Charge-Offs | 0 | 0
Payments | (6,000) | (26,000)
Transfers to ORE | 0 | 0
Net Additions/Deletions | 26,000 | 0
Retail Portfolio Segment [Member] | Acquired Loan [Member] | 1-4 Family Mortgages [Member] |  |
Commercial Loan Portfolio: |  |
Beginning Balance | 316,000 | 178,000
Ending Balance | 335,000 | 177,000
Charge-Offs | 0 | 0
Payments | 0 | (1,000)
Transfers to ORE | 0 | 0
Net Additions/Deletions | $ 19,000 | $ 0

X
- References No definition available. + Details
Name: | mbwm_CommercialLoanPortfolioAbstract
Namespace Prefix: | mbwm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition A financing receivable which had its terms modified during the period and is now considered a troubled restructuring. + References No definition available. + Details
Name: | mbwm_FinancingReceivableModifiedAsTroubledDebtRestructuringsAdditions
Namespace Prefix: | mbwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Reflects the amount of the charge-off related to a troubled debt restructuring. + References No definition available. + Details
Name: | mbwm_FinancingReceivableModifiedAsTroubledDebtRestructuringsChargeOffs
Namespace Prefix: | mbwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow associated with a financing receivable classified as a troubled debt restructuring. + References No definition available. + Details
Name: | mbwm_FinancingReceivableModifiedAsTroubledDebtRestructuringsPayments
Namespace Prefix: | mbwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The transfer of a financing receivable classified as a troubled debt restructuring to other real estate. + References No definition available. + Details
Name: | mbwm_FinancingReceivableModifiedAsTroubledDebtRestructuringsTransferToOtherRealEstate
Namespace Prefix: | mbwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Recorded Investment -URI http://asc.fasb.org/extlink&oid=65880944 + Details
Name: | us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=mbwm_OriginatedLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mbwm_CommercialAndIndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mbwm_VacantLandAndLandDevelopmentAndResidentialConstructionLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mbwm_RealEstateOwnerOccupiedLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mbwm_RealEstateNonOwnerOccupiedLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mbwm_RealEstateMultiFamilyAndResidentialRentalLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=mbwm_AcquiredLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=mbwm_RetailPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mbwm_HomeEquityAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mbwm_OneToFourFamilyMortgagesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |