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Note 6 - Debt Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Amortized cost	$ 682,940	$ 700,528
Gross unrealized gains	170	58
Gross unrealized losses	(42,694)	(52,073)
Estimated fair value	640,416	648,513
US Treasury Securities [Member]
Amortized cost	165,789	176,483
Gross unrealized gains	55	8
Gross unrealized losses	(6,881)	(8,776)
Estimated fair value	158,963	167,715
US Government Agencies Debt Securities [Member]
Amortized cost	90,704	88,625
Gross unrealized gains	24	2
Gross unrealized losses	(4,104)	(5,194)
Estimated fair value	86,624	83,433
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Amortized cost	100,340	103,964
Gross unrealized gains	15	6
Gross unrealized losses	(11,115)	(12,920)
Estimated fair value	89,240	91,050
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	262,297	266,118
Gross unrealized gains	57	35
Gross unrealized losses	(16,793)	(20,591)
Estimated fair value	245,561	245,562
Corporate Debt Securities [Member]
Amortized cost	63,810	65,338
Gross unrealized gains	19	7
Gross unrealized losses	(3,801)	(4,592)
Estimated fair value	$ 60,028	$ 60,753

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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