Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 0.58	$ 0.57	$ 1.16	$ 1.14
Exercise of stock options (in shares)	2,921	1,516	11,690	4,166
Purchase of treasury shares (in shares)	216,906	79,238	292,016	261,137