CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Statement of Stockholders' Equity [Abstract]
Issuance of common stock for dividend reinvestment plan (in shares)	12,201	11,532	10,607	10,744	10,570	10,565
Common stock purchased (in shares)			869,723			40,852
Net issuance of common stock under employee stock plans (in shares)	27,477	9,342	47,428	35,070	20,115	23,617
Cash dividends paid on common stock (in dollars per share)	$ 0.31	$ 0.31	$ 0.31	$ 0.31	$ 0.31	$ 0.30