Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Cash dividends declared, per share (in dollars per share)	$ 0.75	$ 0.75	$ 1.85	$ 1.35
Issuance of shares of common stock pursuant to dividend reinvestment plan, shares (in shares)	99,224	103,141	250,329	186,583
Issuance of shares of common stock, shares (in shares)	2,839	6,182	8,754	14,333
Net change in fair value of available-for-sale securities during the period, taxes	$ 12,148	$ 1,011	$ 38,525	$ 3,019