Unaudited Consolidated Statements of Changes in Shareholders' Equity (Parenthetical)	6 Months Ended
	Jun. 30, 2021 $ / shares shares
Statement Of Stockholders Equity [Abstract]
Exercise of stock options, shares	9,021
Purchase of treasury stock, shares	14,678
Sale of treasury shares	42,184
Dividends declared, per share | $ / shares	$ 0.40