CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Issuance of common stock for dividend reinvestment plan (in shares)	8,631	7,780	8,918	12,201	11,532	10,607
Common stock purchased (in shares)	420,204	90,884	427,396			869,723
Net issuance of common stock under employee stock plans (in shares)	9,426	99,217	126,260	27,477	9,342	47,428
Cash dividends paid on common stock (in dollars per share)	$ 0.33	$ 0.33	$ 0.32	$ 0.31	$ 0.31	$ 0.31