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Note 6 - Debt Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Amortized cost	$ 751,015	$ 798,703
Gross unrealized gains	64	135
Gross unrealized losses	(60,236)	(62,449)
Estimated fair value	690,843	736,389
US Treasury Securities [Member]
Amortized cost	195,837	213,646
Gross unrealized gains	11	29
Gross unrealized losses	(12,242)	(13,587)
Estimated fair value	183,606	200,088
US Government Agencies Debt Securities [Member]
Amortized cost	101,005	99,455
Gross unrealized gains	6	2
Gross unrealized losses	(6,502)	(6,842)
Estimated fair value	94,509	92,615
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Amortized cost	108,189	115,988
Gross unrealized gains	4	0
Gross unrealized losses	(14,045)	(14,124)
Estimated fair value	94,148	101,864
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	272,917	292,475
Gross unrealized gains	43	93
Gross unrealized losses	(22,073)	(22,677)
Estimated fair value	250,887	269,891
Corporate Debt Securities [Member]
Amortized cost	73,067	77,139
Gross unrealized gains	0	11
Gross unrealized losses	(5,374)	(5,219)
Estimated fair value	$ 67,693	$ 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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