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Note 25 - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements (Details) - Condensed Statement of Cash Flows (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash flows from operating activities |  |  |
Net income | $ 17,331,000 us-gaap_NetIncomeLoss | $ 17,033,000 us-gaap_NetIncomeLoss | $ 12,535,000 us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash from operating activities: |  |  |
Stock-based compensation expense | 714,000 us-gaap_ShareBasedCompensation | 473,000 us-gaap_ShareBasedCompensation | 54,000 us-gaap_ShareBasedCompensation
Change in other assets | 1,795,000 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | 8,465,000 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | (1,805,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Net cash from operating activities | 14,414,000 us-gaap_NetCashProvidedByUsedInOperatingActivities | 28,682,000 us-gaap_NetCashProvidedByUsedInOperatingActivities | 17,031,000 us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities |  |  |
Net cash for investing activities | 64,763,000 us-gaap_NetCashProvidedByUsedInInvestingActivities | (12,419,000)us-gaap_NetCashProvidedByUsedInInvestingActivities | 66,730,000 us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities |  |  |
Repurchase of preferred stock | 0 us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock | 0 us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock | (21,000,000)us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock
Repurchase of common stock warrant | 0 us-gaap_PaymentsForRepurchaseOfWarrants | 0 us-gaap_PaymentsForRepurchaseOfWarrants | (7,465,000)us-gaap_PaymentsForRepurchaseOfWarrants
Stock option exercises, net of cashless exercises | 282,000 us-gaap_ProceedsFromStockOptionsExercised | 289,000 us-gaap_ProceedsFromStockOptionsExercised | 227,000 us-gaap_ProceedsFromStockOptionsExercised
Employee stock purchase plan | 23,000 us-gaap_ProceedsFromStockPlans | 19,000 us-gaap_ProceedsFromStockPlans | 39,000 us-gaap_ProceedsFromStockPlans
Dividend reinvestment plan | 209,000 us-gaap_ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan | 33,000 us-gaap_ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan | 14,000 us-gaap_ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan
Stock grants to directors for retainer fees | 155,000 us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims | 0 us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims | 0 us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims
Cash dividends on preferred stock | 0 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock | 0 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock | (496,000)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
Cash dividends on common stock | (24,464,000)us-gaap_PaymentsOfDividendsCommonStock | (3,889,000)us-gaap_PaymentsOfDividendsCommonStock | (774,000)us-gaap_PaymentsOfDividendsCommonStock
Net cash for financing activities | (53,404,000)us-gaap_NetCashProvidedByUsedInFinancingActivities | (5,301,000)us-gaap_NetCashProvidedByUsedInFinancingActivities | (24,130,000)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net change in cash and cash equivalents | 25,773,000 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 10,962,000 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 59,631,000 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Parent Company [Member] |  |  |
Cash flows from operating activities |  |  |
Net income | 17,331,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 17,033,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 12,535,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Adjustments to reconcile net income to net cash from operating activities: |  |  |
Equity in undistributed (income) loss of subsidiary | (9,131,000)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (14,461,000)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 18,730,000 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Stock-based compensation expense | 714,000 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 473,000 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 54,000 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Change in other assets | (8,163,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,244,000 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (3,006,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Change in other liabilities | 21,979,000 mbwm_IncreaseDecreaseInAccruedExpensesAndOtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (708,000)mbwm_IncreaseDecreaseInAccruedExpensesAndOtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,073,000 mbwm_IncreaseDecreaseInAccruedExpensesAndOtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash from operating activities | 22,730,000 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,581,000 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 29,386,000 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash flows from investing activities |  |  |
Net capital investment into subsidiaries | 0 us-gaap_PaymentsToAcquireEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsToAcquireEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsToAcquireEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash for investing activities | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash flows from financing activities |  |  |
Repurchase of preferred stock | 0 us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (21,000,000)us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Repurchase of common stock warrant | 0 us-gaap_PaymentsForRepurchaseOfWarrants / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsForRepurchaseOfWarrants / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (7,465,000)us-gaap_PaymentsForRepurchaseOfWarrants / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Stock option exercises, net of cashless exercises | 282,000 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 289,000 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 227,000 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Employee stock purchase plan | 23,000 us-gaap_ProceedsFromStockPlans / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 19,000 us-gaap_ProceedsFromStockPlans / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 39,000 us-gaap_ProceedsFromStockPlans / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Dividend reinvestment plan | 209,000 us-gaap_ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 33,000 us-gaap_ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 14,000 us-gaap_ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Stock grants to directors for retainer fees | 155,000 us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash dividends on preferred stock | 0 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (496,000)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash dividends on common stock | (24,464,000)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (3,889,000)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (774,000)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash for financing activities | (23,795,000)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (3,548,000)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (29,455,000)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net change in cash and cash equivalents | (1,065,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,033,000 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (69,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at beginning of period | 2,506,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 473,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 542,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at end of period | $ 1,441,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 2,506,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 473,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition Amount of cash inflow from capital contributions to an entity associated with a dividend reinvestment plan. + References No definition available. + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the amount received from the stock plan during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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