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Note 1 - Summary of Significant Accounting Policies (Details) - Year-end Mortgage Loans Held for Sale (USD $)	Dec. 31, 2014	Dec. 31, 2013
Year-end Mortgage Loans Held for Sale [Abstract]
Mortgage loans held for sale	$ 1,574,000us-gaap_LoansHeldForSaleMortgages	$ 1,115,000us-gaap_LoansHeldForSaleMortgages
Less: Allowance to adjust to lower of cost or market	0	0
Mortgage loans held for sale, net	$ 1,574,000mbwm_MortgageLoansHeldForSaleNet	$ 1,115,000mbwm_MortgageLoansHeldForSaleNet

The allowance for other loan and lease losses represents the reserve to cover probable credit losses related to specifically identified other loans and leases, as well as probable credit losses inherent in the remainder of the other loan portfolio as of the balance sheet date. For banks, include currently required allocated transfer risk reserves. Include carryover of or adjustments to the allowance for other loan losses in connection with business combinations determined to be appropriate.

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