Note 10 - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income before income tax expense	$ 25,486	$ 28,635	$ 28,831	$ 34,006	$ 44,905	$ 39,340	$ 44,247	$ 42,732	$ 116,958	$ 171,224	$ 175,058
Federal statutory rate									21.00%	21.00%	21.00%
Computed “expected” Federal income tax expense									$ 24,561	$ 35,957	$ 36,762
State tax, net of federal tax benefit									9,404	13,314	9,127
162M adjustment									779	777	0
Bank owned life insurance									(1,326)	(1,175)	(1,001)
Tax-exempt interest and dividends									(2,514)	(1,969)	(1,405)
Tax benefits from stock-based compensation									(66)	(417)	(261)
Other, net									(883)	(474)	1,483
Income tax expense	$ 6,213	$ 7,228	$ 7,437	$ 9,077	$ 12,348	$ 10,425	$ 11,889	$ 11,351	$ 29,955	$ 46,013	$ 44,705