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Note 3 - Debt Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Amortized cost	$ 700,528	$ 798,703
Gross unrealized gains	58	135
Gross unrealized losses	(52,073)	(62,449)
Estimated fair value	648,513	736,389
US Treasury Securities [Member]
Amortized cost	176,483	213,646
Gross unrealized gains	8	29
Gross unrealized losses	(8,776)	(13,587)
Estimated fair value	167,715	200,088
US Government Agencies Debt Securities [Member]
Amortized cost	88,625	99,455
Gross unrealized gains	2	2
Gross unrealized losses	(5,194)	(6,842)
Estimated fair value	83,433	92,615
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Amortized cost	103,964	115,988
Gross unrealized gains	6	0
Gross unrealized losses	(12,920)	(14,124)
Estimated fair value	91,050	101,864
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	266,118	292,475
Gross unrealized gains	35	93
Gross unrealized losses	(20,591)	(22,677)
Estimated fair value	245,562	269,891
Corporate Debt Securities [Member]
Amortized cost	65,338	77,139
Gross unrealized gains	7	11
Gross unrealized losses	(4,592)	(5,219)
Estimated fair value	$ 60,753	$ 71,931

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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