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Consolidated Statements of Changes in Shareholders' Equity (Parentheticals) - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Employee stock purchase plan, shares 2,058 1,150  
Common Stock [Member]      
Employee stock purchase plan, shares 2,058 1,150 1,098
Dividend reinvestment plan, shares 30,467 10,359 1,954
Stock option exercises, shares 59,117 30,585 51,055
Stock tendered for stock option exercises, shares     18,950
Cash dividends per common share (in Dollars per share) $ 0.58 $ 2.48 $ 0.45
Common stock issued in connection with Firstbank merger   8,087,272  
Stock grants to directors for retainer fees 20,094 7,375  
Share repurchase program 788,541