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Note 4 - Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Securities available-for-sale, amortized costs	$ 687,097	$ 680,496
Securities available-for-sale, gross unrealized gains	32	24
Securities available-for-sale, gross unrealized losses	56,646	78,622
Securities available-for-sale, fair values	630,483	601,898
US Government Agencies Debt Securities [Member]
Securities available-for-sale, amortized costs	322,309	351,136
Securities available-for-sale, gross unrealized gains	0	0
Securities available-for-sale, gross unrealized losses	26,437	40,012
Securities available-for-sale, fair values	295,872	311,124
US States and Political Subdivisions Debt Securities [Member]
Securities available-for-sale, amortized costs	177,617	178,106
Securities available-for-sale, gross unrealized gains	0	0
Securities available-for-sale, gross unrealized losses	25,612	32,372
Securities available-for-sale, fair values	152,005	145,734
Collateralized Mortgage-Backed Securities [Member]
Securities available-for-sale, amortized costs	181,664	143,747
Securities available-for-sale, gross unrealized gains	32	24
Securities available-for-sale, gross unrealized losses	4,033	5,473
Securities available-for-sale, fair values	177,663	138,298
Corporate Debt Securities [Member]
Securities available-for-sale, amortized costs	5,507	6,507
Securities available-for-sale, gross unrealized gains	0	0
Securities available-for-sale, gross unrealized losses	564	764
Securities available-for-sale, fair values	$ 4,943	5,743
US Treasury Securities [Member]
Securities available-for-sale, amortized costs		1,000
Securities available-for-sale, gross unrealized gains		0
Securities available-for-sale, gross unrealized losses		1
Securities available-for-sale, fair values		$ 999

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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