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Note 21 - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements - Condensed Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Assets [Abstract]        
Other Assets $ 148,396 $ 125,566    
Total assets 6,052,161 5,353,224    
LIABILITIES AND SHAREHOLDERS' EQUITY        
Liabilities 5,467,635 4,831,079    
Subordinated debentures 50,330 49,644    
Subordinated notes 89,314 88,971    
Shareholders’ equity 584,526 522,145 $ 441,408 $ 456,559
Total liabilities and shareholders’ equity 6,052,161 5,353,224    
Parent Company [Member]        
Assets [Abstract]        
Cash and cash equivalents 17,420 18,969    
Investments in subsidiaries 691,563 629,710    
Other Assets 18,188 15,122    
Total assets 727,171 663,801    
LIABILITIES AND SHAREHOLDERS' EQUITY        
Liabilities 3,001 3,040    
Subordinated debentures 50,330 49,644    
Subordinated notes 89,314 88,971    
Shareholders’ equity 584,526 522,146    
Total liabilities and shareholders’ equity $ 727,171 $ 663,801