Note 22 - Parent Company Financial Information - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net income	$ 34,428	$ 26,159	$ 34,428	$ 43,526
Net amortization of securities		(1,038)	(1,646)	(1,846)
Net change in other assets		(11,197)	(2,484)	245
Net change in other liabilities		(1,217)	2,677	146
Net cash provided by operating activities		18,966	47,941	51,095
Net cash provided by investing activities		(15,520)	(227,580)	(162,527)
Common stock dividends paid		(12,755)	(12,144)	(11,827)
Repurchase of common stock		(1,044)	(7,505)	(8,810)
Proceeds from exercise of stock options		69	12	89
Net cash used in financing activities		(10,067)	(253,839)	249,630
Net increase (decrease) in cash and cash equivalents		(6,621)	(433,478)	138,198
Parent Company [Member]
Net income		26,159	34,428	43,526
(Equity in undistributed earnings) of subsidiary		(14,756)	(20,678)	(29,616)
Net amortization of securities		0	0	10
Net change in other assets		2,545	(876)	27
Net change in other liabilities		219	109	102
Net cash provided by operating activities		14,167	12,983	14,049
Sales, calls and maturities of equity securities		0	0	6,800
Net cash provided by investing activities		0	0	6,800
Common stock dividends paid		(12,755)	(12,144)	(11,827)
Repurchase of common stock		(1,044)	(7,505)	(8,810)
Proceeds from exercise of stock options		69	12	89
Net change in subordinated debt		0	0	(7,500)
Net cash used in financing activities		(13,730)	(19,637)	(28,048)
Net increase (decrease) in cash and cash equivalents		437	(6,654)	(7,199)
Cash and cash equivalents at beginning of period	$ 10,560	3,906	10,560	17,759
Cash and cash equivalents at end of period		$ 4,343	$ 3,906	$ 10,560