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Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
ASSETS        
Cash and cash equivalents $ 136,003,000 $ 76,372,000 $ 64,198,000 $ 21,735,000
Other assets 15,310,000 14,994,000    
Total assets 1,422,926,000 1,433,229,000    
LIABILITIES AND SHAREHOLDERS' EQUITY        
Liabilities 1,276,336,000 1,268,230,000    
Subordinated debentures 32,990,000 32,990,000    
Shareholders' equity 146,590,000 164,999,000 125,936,000 140,104,000
Total liabilities and shareholders' equity 1,422,926,000 1,433,229,000    
Parent Company [Member]
        
ASSETS        
Cash and cash equivalents 473,000 542,000 1,233,000 1,928,000
Investment in bank subsidiary 173,019,000 192,703,000    
Other assets 7,433,000 5,151,000    
Total assets 180,925,000 198,396,000    
LIABILITIES AND SHAREHOLDERS' EQUITY        
Liabilities 1,345,000 407,000    
Subordinated debentures 32,990,000 32,990,000    
Shareholders' equity 146,590,000 164,999,000    
Total liabilities and shareholders' equity $ 180,925,000 $ 198,396,000