Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical)	3 Months Ended
	Sep. 30, 2021 $ / shares shares	Jun. 30, 2021 $ / shares shares	Mar. 31, 2021 $ / shares shares	Sep. 30, 2020 $ / shares	Jun. 30, 2020 $ / shares	Mar. 31, 2020 $ / shares shares
Consolidated Statements of Changes in Shareholders' Equity (Unaudited) [Abstract]
Stock option exercises (in shares)	1,160	2,225	2,650
Cash dividend declared (in dollars per share) | $ / shares	$ 0.340625	$ 0.340625	$ 0.340625	$ 0.340625	$ 0.340625	$ 0.340625
Purchase of treasury stock (in shares)	50,000	20,000	1,261			97,800