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Note 6 - Debt Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amortized cost	$ 785,681	$ 798,703
Gross unrealized gains	71	135
Gross unrealized losses	(62,547)	(62,449)
Estimated fair value	723,205	736,389
State and political subdivisions	785,681	798,703
US Treasury Securities [Member]
Amortized cost	213,801	213,646
Gross unrealized gains	8	29
Gross unrealized losses	(13,481)	(13,587)
Estimated fair value	200,328	200,088
State and political subdivisions	213,801	213,646
US Government Agencies Debt Securities [Member]
Amortized cost	99,124	99,455
Gross unrealized gains	2	2
Gross unrealized losses	(6,861)	(6,842)
Estimated fair value	92,265	92,615
State and political subdivisions	99,124	99,455
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Amortized cost	112,244	115,988
Gross unrealized gains	1	0
Gross unrealized losses	(14,086)	(14,124)
Estimated fair value	98,159	101,864
State and political subdivisions	112,244	115,988
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	285,410	292,475
Gross unrealized gains	55	93
Gross unrealized losses	(22,610)	(22,677)
Estimated fair value	262,855	269,891
State and political subdivisions	285,410	292,475
Corporate Debt Securities [Member]
Amortized cost	75,102	77,139
Gross unrealized gains	5	11
Gross unrealized losses	(5,509)	(5,219)
Estimated fair value	69,598	71,931
State and political subdivisions	$ 75,102	$ 77,139

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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