Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Common Stock Including Additional Paid in Capital [Member]
Employee stock purchase plan (in shares)	402	414	1,201	1,169
Dividend reinvestment plan (in shares)	5,445	4,952	16,392	14,015
Share repurchase program (in shares)	111,893		231,013
Stock option exercises (in shares)		1,800	2,500	8,800
Stock grants to directors (in shares)			11,905	11,171
Retained Earnings [Member]
Cash dividends per common share (in dollars per share)	$ 0.27	$ 0.24	$ 0.79	$ 0.68
Cash dividends per common share (in dollars per share)	$ 0.27	$ 0.24	$ 0.79	$ 0.68