Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Common dividends declared, per share (in dollars per share)	$ 1.12	$ 1.04	$ 1.00
Issuance of stock to 401(k) plan, shares (in shares)	20,584	16,716	22,693
Repurchase of common shares, shares (in shares)	706,117	949,386	734,653
Repurchase of common shares, per share (in dollars per share)	$ 30.18	$ 30.42	$ 29.77
Common stock options exercised, shares (in shares)	7,575	39,995