Consolidated Statements Of Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Consolidated Statement Of Equity (Parenthetical) [Abstract]
Other comprehensive income (loss) tax			$ 102
Dividend declared per common share	$ 0.9066	$ 0.8474	$ 0.7920
Stock issued for acquisition, shares	37,370,017
Issuance of common stock from stock purchase contracts, shares	4,846,601
Issue of common shares under dividend reinvestment plan	236,666	158,205	45,121
Repurchase of stock, shares	52,359	73,898	69,339
Equity compensation plan, shares	146,867	201,563	169,258
Exercise of stock options, shares	119,306	91,808	174,527