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Note 19 - Subordinated Debentures (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Subordinated Borrowing [Table Text Block]
   
Preferred
Securities
       
Trust Name
 
Outstanding
 
Interest Rate
 
Maturity Date
             
Mercantile Bank Capital Trust I
 
$21,000,000
 
3 Month Libor + 218 bps
 
September 16, 2034
             
Firstbank Capital Trust I
 
$10,000,000
 
3 Month Libor + 199 bps
 
October 18, 2034
             
Firstbank Capital Trust II
 
$10,000,000
 
3 Month Libor + 127 bps
 
April 7, 2036
             
Firstbank Capital Trust III
 
$7,500,000
 
3 Month Libor + 135 bps
 
July 30, 2037
             
Firstbank Capital Trust IV
 
$7,500,000
 
3 Month Libor + 135 bps
 
July 30, 2037