Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]
Common Stock, Dividends, Per Share, Declared	$ 0.51	$ 0.45
Acquisition of treasury stock, shares	2,605
Treasury shares issued under employee stock purchase plan, shares	2,563	6,327
Treasury shares issued under dividend reinvestment plan, shares	18,009	17,267
Common stock issued under stock option plans, shares	10,668