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Note 25 - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements (Details) - Condensed Statements of Income (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income
Interest and dividends from subsidiaries	$ 28,147,000us-gaap_InterestAndDividendIncomeOperating	$ 28,900,000us-gaap_InterestAndDividendIncomeOperating	$ 18,483,000us-gaap_InterestAndDividendIncomeOperating	$ 13,588,000us-gaap_InterestAndDividendIncomeOperating	$ 15,373,000us-gaap_InterestAndDividendIncomeOperating	$ 14,667,000us-gaap_InterestAndDividendIncomeOperating	$ 13,992,000us-gaap_InterestAndDividendIncomeOperating	$ 14,210,000us-gaap_InterestAndDividendIncomeOperating	$ 89,118,000us-gaap_InterestAndDividendIncomeOperating	$ 58,242,000us-gaap_InterestAndDividendIncomeOperating	$ 59,917,000us-gaap_InterestAndDividendIncomeOperating
Expenses
Interest expense									11,340,000us-gaap_InterestExpense	10,786,000us-gaap_InterestExpense	13,216,000us-gaap_InterestExpense
Income before income tax benefit and equity in undistributed net income (loss) of subsidiary									25,196,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	25,125,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	18,171,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Federal income tax benefit									7,865,000us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations	8,092,000us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations	5,636,000us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
Net income									17,331,000us-gaap_NetIncomeLoss	17,033,000us-gaap_NetIncomeLoss	12,535,000us-gaap_NetIncomeLoss
Preferred stock dividends and accretion									0us-gaap_PreferredStockDividendsAndOtherAdjustments	0us-gaap_PreferredStockDividendsAndOtherAdjustments	1,030,000us-gaap_PreferredStockDividendsAndOtherAdjustments
Net income attributable to common shares	6,293,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	5,948,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	1,510,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	3,580,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	5,163,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	3,453,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	4,016,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	4,401,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	17,331,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	17,033,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	11,505,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Comprehensive income									22,920,000us-gaap_ComprehensiveIncomeNetOfTax	9,810,000us-gaap_ComprehensiveIncomeNetOfTax	10,857,000us-gaap_ComprehensiveIncomeNetOfTax
Parent Company [Member]
Income
Interest and dividends from subsidiaries									12,139,000us-gaap_InterestAndDividendIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	5,516,000us-gaap_InterestAndDividendIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	32,532,000us-gaap_InterestAndDividendIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total income									12,139,000us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	5,516,000us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	32,532,000us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Expenses
Interest expense									2,145,000us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,213,000us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	884,000us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other operating expenses									3,552,000us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	2,773,000us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,048,000us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total expenses									5,697,000mbwm_InterestAndOtherOperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	3,986,000mbwm_InterestAndOtherOperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,932,000mbwm_InterestAndOtherOperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before income tax benefit and equity in undistributed net income (loss) of subsidiary									6,442,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,530,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	30,600,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Federal income tax benefit									(1,758,000)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(1,042,000)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(665,000)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in undistributed net income (loss) of subsidiary									9,131,000us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	14,461,000us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(18,730,000)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income									17,331,000us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	17,033,000us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	12,535,000us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Preferred stock dividends and accretion									0us-gaap_PreferredStockDividendsAndOtherAdjustments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	0us-gaap_PreferredStockDividendsAndOtherAdjustments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,030,000us-gaap_PreferredStockDividendsAndOtherAdjustments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income attributable to common shares									17,331,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	17,033,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	11,505,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Comprehensive income									$ 22,920,000us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 9,810,000us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 10,857,000us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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