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Note 7 - Federal Home Loan Bank of Indianapolis Advances (Tables) | 9 Months Ended
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Sep. 30, 2015
Disclosure Text Block [Abstract] |
Maturities of Currently Outstanding FHLB Advances [Table Text Block] |
2015 |  | $ | 0 |
2016 |  |  | 3,000,000 |
2017 |  |  | 45,000,000 |
2018 |  |  | 0 |
Thereafter |  |  | 20,000,000 |

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- Definition Tabular disclosure of the maturities of currently outstanding Federal Home Loan Bank advances. + References No definition available. + Details
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Namespace Prefix: | mbwm_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration