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Note 24 - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements (Details) - Condensed Statements of Income - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income |  |  |  |  |  |  |  |  |  |  |
Interest and dividends from subsidiaries | $ 28,575,000 | $ 28,501,000 | $ 27,663,000 | $ 27,589,000 | $ 28,147,000 | $ 28,900,000 | $ 18,483,000 | $ 13,588,000 | $ 112,328,000 | $ 89,118,000 | $ 58,242,000
Expenses |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 11,154,000 | 11,340,000 | 10,786,000
Income before income tax benefit and equity in undistributed net income of subsidiary |  |  |  |  |  |  |  |  | 38,831,000 | 25,196,000 | 25,125,000
Federal income tax benefit |  |  |  |  |  |  |  |  | 11,811,000 | 7,865,000 | 8,092,000
Net income |  |  |  |  |  |  |  |  | 27,020,000 | 17,331,000 | 17,033,000
Comprehensive income |  |  |  |  |  |  |  |  | 28,267,000 | 22,920,000 | 9,810,000
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Income |  |  |  |  |  |  |  |  |  |  |
Interest and dividends from subsidiaries |  |  |  |  |  |  |  |  | 24,166,000 | 12,139,000 | 5,516,000
Total income |  |  |  |  |  |  |  |  | 24,166,000 | 12,139,000 | 5,516,000
Expenses |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 2,569,000 | 2,145,000 | 1,213,000
Other operating expenses |  |  |  |  |  |  |  |  | 2,276,000 | 3,552,000 | 2,773,000
Total expenses |  |  |  |  |  |  |  |  | 4,845,000 | 5,697,000 | 3,986,000
Income before income tax benefit and equity in undistributed net income of subsidiary |  |  |  |  |  |  |  |  | 19,321,000 | 6,442,000 | 1,530,000
Federal income tax benefit |  |  |  |  |  |  |  |  | (2,051,000) | (1,758,000) | (1,042,000)
Equity in undistributed net income of subsidiary |  |  |  |  |  |  |  |  | 5,648,000 | 9,131,000 | 14,461,000
Net income |  |  |  |  |  |  |  |  | 27,020,000 | 17,331,000 | 17,033,000
Comprehensive income |  |  |  |  |  |  |  |  | $ 28,267,000 | $ 22,920,000 | $ 9,810,000

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