Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Common Stock [Member]
Employee stock purchase plan, shares (in shares)	1,121	1,610
Dividend reinvestment plan, shares (in shares)	44,535	22,248
Stock option exercises, shares (in shares)	50,323	27,375
Stock grants to directors for retainer fees (in shares)	13,000	20,094
Share repurchase program, shares (in shares)	167,878	765,260
Retained Earnings [Member]
Cash dividends per common share (in dollars per share)	$ 0.49	$ 0.43
Cash dividends per common share (in dollars per share)	$ 0.49	$ 0.43