Consolidated Statements Of Changes In Stockholders’ Equity (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Consolidated Statements Of Changes In Stockholders’ Equity [Abstract]
Cash dividends per common share	$ 0.80	$ 0.76
Issued shares in stock offering	440,000
Repurchased shares in treasury stock	9,218	3,280
Issued restricted shares	13,936	19,093
Reissued restricted shares	741
Issued shares under Dividend Reinvestment Plan	3,253	5,270
Issued shares in Employee Stock Purchase Plan	3,713	5,166
Issued shares in stock option exercises	10,001	490
Reissued shares in stock option exercises	13,300	267
Reissued restricted shares, net of forfeitures		3,215