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Note 3 - Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Securities available-for-sale, amortized costs	$ 530,075	$ 435,166
Securities available-for-sale, gross unrealized gains	17,170	2,951
Securities available-for-sale, gross unrealized losses	503	2,854
Securities available-for-sale, fair values	546,742	435,263
US Government Agencies Debt Securities [Member]
Securities available-for-sale, amortized costs	86,859	119,903
Securities available-for-sale, gross unrealized gains	4,477	1,995
Securities available-for-sale, gross unrealized losses	173	775
Securities available-for-sale, fair values	91,163	121,123
US States and Political Subdivisions Debt Securities [Member]
Securities available-for-sale, amortized costs	196,435	88,092
Securities available-for-sale, gross unrealized gains	7,778	791
Securities available-for-sale, gross unrealized losses	252	644
Securities available-for-sale, fair values	203,961	88,239
Collateralized Mortgage Backed Securities [Member]
Securities available-for-sale, amortized costs	244,780	223,173
Securities available-for-sale, gross unrealized gains	4,473	45
Securities available-for-sale, gross unrealized losses	78	1,435
Securities available-for-sale, fair values	249,175	221,783
Corporate Debt Securities [Member]
Securities available-for-sale, amortized costs	2,001	3,998
Securities available-for-sale, gross unrealized gains	442	120
Securities available-for-sale, fair values	$ 2,443	$ 4,118

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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