Consolidated Statements Of Changes In Stockholders’ Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statements Of Changes In Stockholders’ Equity [Abstract]
Cash dividends per common share	$ 0.76	$ 0.72	$ 0.65
Repurchased shares in treasury stock	3,280	8,676	59,800
Issued restricted shares	19,093
Reissued restricted shares		20,942	186
Issued shares under Dividend Reinvestment Plan	7,162
Issued shares in Employee Stock Purchase Plan	10,596	10,574	12,821
Issued shares in stock option exercises	5,450	7,832
Reissued shares under Dividend Reinvestment Plan	2,902	11,197	11,265
Reissued shares in stock option exercises	267	15,235	23,331
Reissued restricted shares, net of forfeitures	3,215		20,517
Reissued restricted shares, forfeitures	1,950		5,998