XML 53 R44.htm IDEA: XBRL DOCUMENT
v3.22.2

Note 3 - Loans and Allowance for Credit Losses - Nonaccrual Loans (Details) | Jun. 30, 2022 USD ($)
--- | ---
Recorded Principal Balance, With no Allowance Recorded | $ 1,703,000
Recorded Principal Balance, With Allowance Recorded | 84,000
Financing Receivable, Nonaccrual, Allowance | 48,000
Nonaccrual loans | 1,787,000
Commercial Portfolio Segment [Member] |
Recorded Principal Balance, With no Allowance Recorded | 248,000
Recorded Principal Balance, With Allowance Recorded | 0
Financing Receivable, Nonaccrual, Allowance | 0
Nonaccrual loans | 248,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] |
Recorded Principal Balance, With no Allowance Recorded | 248,000
Recorded Principal Balance, With Allowance Recorded | 0
Financing Receivable, Nonaccrual, Allowance | 0
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] |
Recorded Principal Balance, With no Allowance Recorded | 0
Recorded Principal Balance, With Allowance Recorded | 0
Financing Receivable, Nonaccrual, Allowance | 0
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] |
Recorded Principal Balance, With no Allowance Recorded | 0
Recorded Principal Balance, With Allowance Recorded | 0
Financing Receivable, Nonaccrual, Allowance | 0
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] |
Recorded Principal Balance, With no Allowance Recorded | 0
Recorded Principal Balance, With Allowance Recorded | 0
Financing Receivable, Nonaccrual, Allowance | 0
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] |
Recorded Principal Balance, With no Allowance Recorded | 0
Recorded Principal Balance, With Allowance Recorded | 0
Financing Receivable, Nonaccrual, Allowance | 0
Retail Portfolio Segment [Member] |
Recorded Principal Balance, With no Allowance Recorded | 1,455,000
Recorded Principal Balance, With Allowance Recorded | 84,000
Financing Receivable, Nonaccrual, Allowance | 48,000
Nonaccrual loans | 1,539,000
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] |
Recorded Principal Balance, With no Allowance Recorded | 1,000
Recorded Principal Balance, With Allowance Recorded | 84,000
Financing Receivable, Nonaccrual, Allowance | 48,000
Retail Portfolio Segment [Member] | Other Consumer Loans [Member] |
Recorded Principal Balance, With no Allowance Recorded | 1,454,000
Recorded Principal Balance, With Allowance Recorded | 0
Financing Receivable, Nonaccrual, Allowance | $ 0

X
- Definition Allowance of nonaccrual financing receivable. + References No definition available. + Details
Name: | mbwm_FinancingReceivableNonaccrualAllowance
Namespace Prefix: | mbwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amortized cost of financing receivable on nonaccrual status with allowance for credit loss. Excludes net investment in lease. + References No definition available. + Details
Name: | mbwm_FinancingReceivableNonaccrualWithAllowance
Namespace Prefix: | mbwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447 + Details
Name: | us-gaap_FinancingReceivableNonaccrualNoAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5111-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (2) + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
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_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_FinancingReceivablePortfolioSegmentAxis=mbwm_RetailPortfolioSegmentMember
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: |

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