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Note 3 - Securities - Fair Value of Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Amortized cost	$ 357,542	$ 361,290
Gross unrealized gains	112	138
Gross unrealized losses	(489)	(898)
Fair value	357,165	360,530
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	702	703
Gross unrealized gains	4	3
Gross unrealized losses	0	0
Fair value	706	706
US Treasury Securities [Member]
Amortized cost	343,183	246,876
Gross unrealized gains	77	103
Gross unrealized losses	(405)	(689)
Fair value	342,855	246,290
US Government-sponsored Enterprises Debt Securities [Member]
Amortized cost	10,000	109,900
Gross unrealized gains	0	1
Gross unrealized losses	(19)	(128)
Fair value	9,981	109,773
Residential Mortgage-Backed Securities [Member]
Amortized cost	2,824	2,949
Gross unrealized gains	31	31
Gross unrealized losses	(55)	(69)
Fair value	2,800	2,911
Collateralized Mortgage-Backed Securities [Member]
Amortized cost	833	862
Gross unrealized gains	0	0
Gross unrealized losses	(10)	(12)
Fair value	$ 823	$ 850

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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