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Note 23 - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements - Condensed Statements of Income (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income                      
Interest and dividends from subsidiaries $ 37,620,000 $ 35,594,000 $ 37,164,000 $ 37,935,000 $ 39,564,000 $ 40,316,000 $ 39,820,000 $ 38,637,000 $ 148,313,000 $ 158,337,000 $ 141,981,000
Expenses                      
Interest expense                 26,067,000 33,803,000 21,899,000
Income before income tax benefit and equity in undistributed net income of subsidiary                 54,848,000 60,460,000 51,822,000
Federal income tax benefit                 10,710,000 11,004,000 9,798,000
Net income $ 14,082,000 $ 10,686,000 $ 8,697,000 $ 10,673,000 $ 13,317,000 $ 12,600,000 $ 11,715,000 $ 11,824,000 44,138,000 49,456,000 42,024,000
Comprehensive income                 45,929,000 61,390,000 38,646,000
Parent Company [Member]                      
Income                      
Interest and dividends from subsidiaries                 32,588,000 22,246,000 33,832,000
Total income                 32,588,000 22,246,000 33,832,000
Expenses                      
Interest expense                 2,268,000 3,153,000 2,999,000
Other operating expenses                 4,441,000 4,804,000 4,424,000
Total expenses                 6,709,000 7,957,000 7,423,000
Income before income tax benefit and equity in undistributed net income of subsidiary                 25,879,000 14,289,000 26,409,000
Federal income tax benefit                 (1,173,000) (1,718,000) (1,610,000)
Equity in undistributed net income of subsidiary                 17,086,000 33,449,000 14,005,000
Net income                 44,138,000 49,456,000 42,024,000
Comprehensive income                 $ 45,929,000 $ 61,390,000 $ 38,646,000