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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income |  |  |
Interest and dividends from subsidiaries | $ 271,358 | $ 181,839 | $ 143,494
Expenses |  |  |
Interest expense | 77,813 | 23,595 | 19,432
Federal income tax benefit | 20,482 | 14,727 | 14,695
Net income | 82,217 | 61,063 | 59,021
Other comprehensive income (loss) | 14,854 | (61,612) | (9,215)
Comprehensive income (loss) | 97,071 | (549) | 49,806
Parent Company [Member] |  |  |
Income |  |  |
Interest and dividends from subsidiaries | 26,660 | 26,056 | 39,058
Total income | 26,660 | 26,056 | 39,058
Expenses |  |  |
Interest expense | 8,091 | 6,104 | 1,934
Other operating expenses | 5,674 | 5,645 | 5,831
Total expenses | 13,765 | 11,749 | 7,765
Income before income tax benefit and equity in undistributed net income of subsidiary | 12,895 | 14,307 | 31,293
Federal income tax benefit | (2,858) | (2,535) | (1,653)
Equity in undistributed net income of subsidiary | 66,464 | 44,221 | 26,075
Net income | 82,217 | 61,063 | 59,021
Other comprehensive income (loss) | 14,854 | (61,612) | (9,215)
Comprehensive income (loss) | $ 97,071 | $ (549) | $ 49,806

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