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Note 22 - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements - Condensed Statements of Income (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income      
Interest and dividends from subsidiaries $ 181,839,000 $ 143,494,000 $ 148,313,000
Expenses      
Interest expense 23,595,000 19,432,000 26,067,000
Federal income tax benefit 14,727,000 14,695,000 10,710,000
Net income 61,063,000 59,021,000 44,138,000
Comprehensive income (loss) (549,000) 49,806,000 45,929,000
Parent Company [Member]      
Income      
Interest and dividends from subsidiaries 26,056,000 39,058,000 32,588,000
Total income 26,056,000 39,058,000 32,588,000
Expenses      
Interest expense 6,104,000 1,934,000 2,268,000
Other operating expenses 5,645,000 5,831,000 4,441,000
Total expenses 11,749,000 7,765,000 6,709,000
Income before income tax benefit and equity in undistributed net income of subsidiary 14,307,000 31,293,000 25,879,000
Federal income tax benefit (2,535,000) (1,653,000) (1,173,000)
Equity in undistributed net income of subsidiary 44,221,000 26,075,000 17,086,000
Net income 61,063,000 59,021,000 44,138,000
Comprehensive income (loss) $ (549,000) $ 49,806,000 $ 45,929,000