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Note 5 - Mortgage Loan Servicing - Estimated Amortization (Details) | Dec. 31, 2020 USD ($)
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2021 | $ 1,724,000
2022 | 1,476,000
2023 | 1,241,000
2024 | 1,026,000
2025 | 834,000
Thereafter | $ 1,888,000

X
- Definition Amount of amortization expense for mortgage servicing rights expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
Name: | mbwm_MortgageServicingRightsAmortizationExpenseAfterYearFive
Namespace Prefix: | mbwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization expense for mortgage servicing rights expected to be recognized during the next fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | mbwm_MortgageServicingRightsAmortizationExpenseNextTwelveMonths
Namespace Prefix: | mbwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization expense for mortgage servicing rights expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
Name: | mbwm_MortgageServicingRightsAmortizationExpenseYearFive
Namespace Prefix: | mbwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization expense for mortgage servicing rights expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
Name: | mbwm_MortgageServicingRightsAmortizationExpenseYearFour
Namespace Prefix: | mbwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization expense for mortgage servicing rights expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
Name: | mbwm_MortgageServicingRightsAmortizationExpenseYearThree
Namespace Prefix: | mbwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization expense for mortgage servicing rights to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
Name: | mbwm_MortgageServicingRightsAmortizationExpenseYearTwo
Namespace Prefix: | mbwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant