Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 0.58	$ 0.57	$ 1.74	$ 1.71
Exercise of stock options (in shares)	1,408	755	13,098	4,921
Purchase of treasury shares (in shares)	336,793	230,861	628,809	491,998