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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

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