CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Stockholders' Equity [Abstract]
Cash dividends (in dollars per share)	$ 0.52	$ 0.5
Net exercise of stock options and related tax benefit (in shares)	3,011	4,996
Common stock repurchased and returned to unissued status (in shares)	71,288
Directors deferred compensation plan (in shares)	6,016	4,770
Restricted stock activity (in shares)	2,365	3,295