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Note 23 - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements - Condensed Balance Sheets (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
ASSETS        
Other assets $ 44,599,000 $ 32,812,000    
Total assets 4,437,344,000 3,632,915,000    
LIABILITIES AND SHAREHOLDERS' EQUITY        
Liabilities 3,995,790,000 3,216,354,000    
Subordinated debentures 47,563,000 46,881,000    
Shareholders’ equity 441,554,000 416,561,000 $ 375,249,000 $ 365,870,000
Total liabilities and shareholders’ equity 4,437,344,000 3,632,915,000    
Parent Company [Member]        
ASSETS        
Cash and cash equivalents 12,746,000 6,045,000 $ 9,653,000 $ 9,704,000
Investment in bank subsidiary 458,830,000 439,946,000    
Other assets 18,934,000 18,032,000    
Total assets 490,510,000 464,023,000    
LIABILITIES AND SHAREHOLDERS' EQUITY        
Liabilities 1,393,000 581,000    
Subordinated debentures 47,563,000 46,881,000    
Shareholders’ equity 441,554,000 416,561,000    
Total liabilities and shareholders’ equity $ 490,510,000 $ 464,023,000