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Note 23 - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements - Condensed Balance Sheets (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Other assets | $ 32,812,000 | $ 31,458,000 |  |
Total assets | 3,632,915,000 | 3,363,907,000 |  |
LIABILITIES AND SHAREHOLDERS' EQUITY |  |  |  |
Liabilities | 3,216,354,000 | 2,988,658,000 |  |
Subordinated debentures | 46,881,000 | 46,199,000 |  |
Shareholders’ equity | 416,561,000 | 375,249,000 | $ 365,870,000 | $ 340,811,000
Total liabilities and shareholders’ equity | 3,632,915,000 | 3,363,907,000 |  |
Parent Company [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 6,045,000 | 9,653,000 | $ 9,704,000 | $ 4,257,000
Investment in bank subsidiary | 439,946,000 | 394,561,000 |  |
Other assets | 18,032,000 | 19,740,000 |  |
Total assets | 464,023,000 | 423,954,000 |  |
LIABILITIES AND SHAREHOLDERS' EQUITY |  |  |  |
Liabilities | 581,000 | 2,506,000 |  |
Subordinated debentures | 46,881,000 | 46,199,000 |  |
Shareholders’ equity | 416,561,000 | 375,249,000 |  |
Total liabilities and shareholders’ equity | $ 464,023,000 | $ 423,954,000 |  |

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