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Subordinated Debentures - Additional Information (Detail) (USD $)
1 Months Ended 0 Months Ended
Sep. 30, 2004
Sep. 16, 2004
Series A Note [Member]
Mercantile Bank Capital Trust [Member]
Dec. 10, 2004
Series B Notes [Member]
Mercantile Bank Capital Trust [Member]
Sep. 16, 2004
Series A Preferred Stock [Member]
Sep. 16, 2004
Common Class A [Member]
Mercantile Bank Capital Trust [Member]
Dec. 10, 2004
Series B Preferred Stock [Member]
Dec. 10, 2004
Common Class B [Member]
Mercantile Bank Capital Trust [Member]
Subordinated Borrowing [Line Items]              
Series A and B Preferred Securities sold in a private sale       $ 16,000,000   $ 16,000,000  
Series A and B Common Securities sold by trust to Mercantile         495,000   495,000
Proceeds of series A preferred securities and series A common securities used to purchase of series A floating rate notes   16,495,000 16,495,000        
Preferred Securities percentage 9.60%            
Proceeds of Series A floating rate notes to finance redemption $ 16,000,000