Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]
Common Stock, Dividends, Per Share, Declared	$ 0.82	$ 0.74	$ 0.68
Acquisition of treasury stock, shares	34,048
Treasury shares issued under stock option plan, shares	907	4,794	3,793
Treasury shares issued under dividend reinvestment plan, shares	45,068
Common stock issued under dividend reinvestment plan, shares	25,230	52,755	45,864
Common stock issued under stock option plans, shares	3,800