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Note 8 - Commitments and Off-balance Sheet Risk (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Reserve or Liability Balance for Financial Instruments With Off Balance Sheet Risk	$ 0	$ 0

X

- Definition

The carrying amount for the reserve or liability for financial instruments with off-balance sheet risk.

+ References

No definition available.

+ Details

Name:	mbwm_ReserveOrLiabilityBalanceForFinancialInstrumentsWithOffBalanceSheetRisk
Namespace Prefix:	mbwm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant