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Note 6 - Debt Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Amortized cost	$ 727,871	$ 798,703
Gross unrealized gains	559	135
Gross unrealized losses	(39,835)	(62,449)
Estimated fair value	688,595	736,389
US Treasury Securities [Member]
Amortized cost	186,405	213,646
Gross unrealized gains	218	29
Gross unrealized losses	(7,840)	(13,587)
Estimated fair value	178,783	200,088
US Government Agencies Debt Securities [Member]
Amortized cost	97,673	99,455
Gross unrealized gains	142	2
Gross unrealized losses	(4,064)	(6,842)
Estimated fair value	93,751	92,615
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Amortized cost	104,041	115,988
Gross unrealized gains	7	0
Gross unrealized losses	(10,142)	(14,124)
Estimated fair value	93,906	101,864
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	270,717	292,475
Gross unrealized gains	135	93
Gross unrealized losses	(14,470)	(22,677)
Estimated fair value	256,382	269,891
Corporate Debt Securities [Member]
Amortized cost	69,035	77,139
Gross unrealized gains	57	11
Gross unrealized losses	(3,319)	(5,219)
Estimated fair value	$ 65,773	$ 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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