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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

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