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Note 3 - Debt Securities - Available For Sale Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Securities available for sale, less than 12 months, fair value	$ 34,752	$ 268,457
Securities available for sale, less than 12 months, unrealized losses	(476)	(15,556)
Securities available for sale, 12 months or longer, fair value	238,489	20,794
Securities available for sale, 12 months or longer, unrealized losses	(21,483)	(4,242)
Securities available for sale, total fair value	273,241	289,251
Securities available for sale, total unrealized losses	(21,959)	(19,798)
US Government Agencies Debt Securities [Member]
Securities available for sale, less than 12 months, fair value	5,741	1,485
Securities available for sale, less than 12 months, unrealized losses	(9)	(15)
Securities available for sale, 12 months or longer, fair value	0	0
Securities available for sale, 12 months or longer, unrealized losses	0	0
Securities available for sale, total fair value	5,741	1,485
Securities available for sale, total unrealized losses	(9)	(15)
US Treasury Securities [Member]
Securities available for sale, less than 12 months, fair value	11,301	157,264
Securities available for sale, less than 12 months, unrealized losses	(39)	(4,353)
Securities available for sale, 12 months or longer, fair value	132,373	0
Securities available for sale, 12 months or longer, unrealized losses	(1,970)	0
Securities available for sale, total fair value	143,674	157,264
Securities available for sale, total unrealized losses	(2,009)	(4,353)
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale, less than 12 months, fair value	13,165	12,347
Securities available for sale, less than 12 months, unrealized losses	(261)	(192)
Securities available for sale, 12 months or longer, fair value	5,391	0
Securities available for sale, 12 months or longer, unrealized losses	(289)	0
Securities available for sale, total fair value	18,556	12,347
Securities available for sale, total unrealized losses	(550)	(192)
Corporate Debt Securities [Member]
Securities available for sale, less than 12 months, fair value	0	32,368
Securities available for sale, less than 12 months, unrealized losses	0	(2,172)
Securities available for sale, 12 months or longer, fair value	26,249	2,489
Securities available for sale, 12 months or longer, unrealized losses	(2,310)	(17)
Securities available for sale, total fair value	26,249	34,857
Securities available for sale, total unrealized losses	(2,310)	(2,189)
Mortgage-backed Agency Securities [Member]
Securities available for sale, less than 12 months, fair value	4,545	64,993
Securities available for sale, less than 12 months, unrealized losses	(167)	(8,824)
Securities available for sale, 12 months or longer, fair value	74,476	18,305
Securities available for sale, 12 months or longer, unrealized losses	(16,914)	(4,225)
Securities available for sale, total fair value	79,021	83,298
Securities available for sale, total unrealized losses	$ (17,081)	$ (13,049)

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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