Note 3 - Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Securities available-for-sale, amortized costs	$ 759,917	$ 682,467
Securities available-for-sale, gross unrealized gains	87	10,680
Securities available-for-sale, gross unrealized losses	103,152	7,067
Securities available for sale, at fair value	656,852	686,080
US Government Agencies Debt Securities [Member]
Securities available-for-sale, amortized costs	391,538	279,934
Securities available-for-sale, gross unrealized gains	39	2,795
Securities available-for-sale, gross unrealized losses	55,002	4,710
Securities available for sale, at fair value	336,575	278,019
US States and Political Subdivisions Debt Securities [Member]
Securities available-for-sale, amortized costs	190,192	195,365
Securities available-for-sale, gross unrealized gains	26	5,314
Securities available-for-sale, gross unrealized losses	38,018	2,007
Securities available for sale, at fair value	152,200	198,672
Collateralized Mortgage-Backed Securities [Member]
Securities available-for-sale, amortized costs	170,694	204,164
Securities available-for-sale, gross unrealized gains	22	2,323
Securities available-for-sale, gross unrealized losses	9,239	313
Securities available for sale, at fair value	161,477	206,174
Corporate Debt Securities [Member]
Securities available-for-sale, amortized costs	6,501	3,004
Securities available-for-sale, gross unrealized gains	0	248
Securities available-for-sale, gross unrealized losses	837	37
Securities available for sale, at fair value	5,664	$ 3,215
US Treasury Securities [Member]
Securities available-for-sale, amortized costs	992
Securities available-for-sale, gross unrealized gains	0
Securities available-for-sale, gross unrealized losses	56
Securities available for sale, at fair value	$ 936

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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