CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' 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]
Treasury stock purchased, shares	3,100	7,200	7,600	16,526	32,966	49,911
Treasury stock issued, shares	8,574	10,611	7,936	9,050	8,354	7,670
Cash dividends paid, per share	$ 0.17	$ 0.17	$ 0.16	$ 0.16	$ 0.16	$ 0.16