Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]
Common Stock, Dividends, Per Share, Declared	$ 0.24	$ 0.21
Acquisition of treasury stock, shares	2,605
Treasury shares issued under stock option plan, shares	200	1,126
Treasury shares issued under dividend reinvestment plan, shares	5,911	7,463
Common stock issued under dividend reinvestment plan, shares	6,518