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Note 3 - Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Securities available-for-sale, amortized costs	$ 682,467	$ 530,075
Securities available-for-sale, gross unrealized gains	10,680	17,170
Securities available-for-sale, gross unrealized losses	7,067	503
Securities available for sale, at fair value	686,080	546,742
US Government Agencies Debt Securities [Member]
Securities available-for-sale, amortized costs	279,934	86,859
Securities available-for-sale, gross unrealized gains	2,795	4,477
Securities available-for-sale, gross unrealized losses	4,710	173
Securities available for sale, at fair value	278,019	91,163
US States and Political Subdivisions Debt Securities [Member]
Securities available-for-sale, amortized costs	195,365	196,435
Securities available-for-sale, gross unrealized gains	5,314	7,778
Securities available-for-sale, gross unrealized losses	2,007	252
Securities available for sale, at fair value	198,672	203,961
Collateralized Mortgage Backed Securities [Member]
Securities available-for-sale, amortized costs	204,164	244,780
Securities available-for-sale, gross unrealized gains	2,323	4,473
Securities available-for-sale, gross unrealized losses	313	78
Securities available for sale, at fair value	206,174	249,175
Corporate Debt Securities [Member]
Securities available-for-sale, amortized costs	3,004	2,001
Securities available-for-sale, gross unrealized gains	248	442
Securities available-for-sale, gross unrealized losses	37
Securities available for sale, at fair value	$ 3,215	$ 2,443

X

- Definition

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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