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Note 3 - Securities - Amortized Cost and Estimated Fair Values of Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Available-for-sale securities, amortized cost	$ 539,390	$ 545,274
Available-for-sale securities, gross unrealized gains	2,032	2,948
Available-for-sale securities, gross unrealized losses	(24,090)	(30,144)
Available-for-sale securities, fair market value	517,332	518,078
US Government Agencies Debt Securities [Member]
Available-for-sale securities, amortized cost	96,862	84,678
Available-for-sale securities, gross unrealized gains	226	11
Available-for-sale securities, gross unrealized losses	(3,106)	(4,430)
Available-for-sale securities, fair market value	93,982	80,259
Collateralized Mortgage Obligations [Member]
Available-for-sale securities, amortized cost	26,388	9,108
Available-for-sale securities, gross unrealized gains	65	0
Available-for-sale securities, gross unrealized losses	(355)	(444)
Available-for-sale securities, fair market value	26,098	8,664
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities, amortized cost	322,063	345,981
Available-for-sale securities, gross unrealized gains	1,671	2,792
Available-for-sale securities, gross unrealized losses	(17,522)	(19,865)
Available-for-sale securities, fair market value	306,212	328,908
SBA Pool [Member]
Available-for-sale securities, amortized cost	940	1,394
Available-for-sale securities, gross unrealized gains	1	3
Available-for-sale securities, gross unrealized losses	(1)	(2)
Available-for-sale securities, fair market value	940	1,395
Corporate Debt Securities [Member]
Available-for-sale securities, amortized cost	43,500	47,500
Available-for-sale securities, gross unrealized gains	10	9
Available-for-sale securities, gross unrealized losses	(2,477)	(3,992)
Available-for-sale securities, fair market value	41,033	43,517
Asset-Backed Securities [Member]
Available-for-sale securities, amortized cost	49,637	56,613
Available-for-sale securities, gross unrealized gains	59	133
Available-for-sale securities, gross unrealized losses	(629)	(1,411)
Available-for-sale securities, fair market value	$ 49,067	$ 55,335

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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