CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Cash dividends (in dollars per share)	$ 0.52	$ 0.54
Net exercise of stock options (in shares)	3,011	2,733
Common stock repurchased and returned to unissued status (in shares)	(71,288)	(21,531)
Directors deferred compensation plan (in shares)	(6,016)	(6,395)
Restricted stock activity (in shares)	(2,365)	(2,896)