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Note 24 - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements (Details) - Condensed Balance Sheets - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Feb. 29, 2012
ASSETS          
Other assets $ 29,123,000 $ 33,024,000      
Total assets 2,903,556,000 2,893,379,000      
LIABILITIES AND SHAREHOLDERS’ EQUITY          
Liabilities 2,569,752,000 2,565,241,000      
Subordinated debentures 55,154,000 54,472,000     $ 32,000,000
Shareholders’ equity 333,804,000 328,138,000 $ 153,325,000 $ 146,590,000  
Total liabilities and shareholders’ equity 2,903,556,000 2,893,379,000      
Parent Company [Member]          
ASSETS          
Cash and cash equivalents 4,940,000 1,441,000 $ 2,506,000 $ 473,000  
Investment in bank subsidiary 368,248,000 361,355,000      
Other assets 20,940,000 20,948,000      
Total assets 394,128,000 383,744,000      
LIABILITIES AND SHAREHOLDERS’ EQUITY          
Liabilities 5,170,000 1,134,000      
Subordinated debentures 55,154,000 54,472,000      
Shareholders’ equity 333,804,000 328,138,000      
Total liabilities and shareholders’ equity $ 394,128,000 $ 383,744,000