Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]
Common Stock, Dividends, Per Share, Declared	$ 0.69	$ 0.61
Acquisition of treasury stock, shares		30,196
Treasury shares issued under stock option plan, shares	6,568	539
Treasury shares issued under dividend reinvestment plan, shares	22,990	24,171
Common stock issued under dividend reinvestment plan, shares		25,230
Common stock issued under stock option plans, shares		3,600