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Note 21 - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements - Condensed Statements of Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income      
Interest and dividends from subsidiaries $ 321,502 $ 271,358 $ 181,839
Expenses      
Federal income tax benefit 18,693 20,482 14,727
Net income 79,593 82,217 61,063
Other comprehensive income (loss) 662 14,854 (61,612)
Comprehensive income (loss) 80,255 97,071 (549)
Parent Company [Member]      
Income      
Interest and dividends from subsidiaries 30,061 26,660 26,056
Total income 30,061 26,660 26,056
Expenses      
Interest expense 8,203 8,091 6,104
Other operating expenses 5,647 5,674 5,645
Total expenses 13,850 13,765 11,749
Income before income tax benefit and equity in undistributed net income of subsidiary 16,211 12,895 14,307
Federal income tax benefit (3,240) (2,858) (2,535)
Equity in undistributed net income of subsidiary 60,142 66,464 44,221
Net income 79,593 82,217 61,063
Other comprehensive income (loss) 662 14,854 (61,612)
Comprehensive income (loss) $ 80,255 $ 97,071 $ (549)