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Note 9 - Hedging Activities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Feb. 29, 2012
Note 9 - Hedging Activities (Details) [Line Items]
Trust Preferred Securities			$ 32.0
Fair Value Of Interest Rate Swap Agreement Liability	0.2	0.3
London Interbank Offered Rate (LIBOR) [Member]
Note 9 - Hedging Activities (Details) [Line Items]
Fixed Spread Added To Variable Rate On Our Trust Preferred Securities			2.18%
Derivative, Notional Amount			$ 32.0

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The fair value of the interest rate swap agreement liability.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Fixed spread added to the variable rate on our trust preferred securities.

+ References

No definition available.

+ Details

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Namespace Prefix:	mbwm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:	mbwm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Trust preferred securities.

+ References

No definition available.

+ Details

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