Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Common stock cash dividends, per share, adjusted	$ 0.371	$ 0.345
Common stock dividend, shares at fair value	399,088	294,507
Issuance and reissuance of common stock including related tax benefit:
Shares under the dividend reinvestment and stock purchase plan	15,425	14,756
Shares under the stock option plan	5,621	41,207
Shares of stock-based compensation awards	2,421
Shares under employee stock purchase plan	4,447	3,361