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Note 3 - Debt Securities - Available For Sale Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Securities available for sale, less than 12 months, fair value	$ 76,143	$ 268,457
Securities available for sale, less than 12 months, unrealized losses	(1,164)	(15,556)
Securities available for sale, 12 months or longer, fair value	208,094	20,794
Securities available for sale, 12 months or longer, unrealized losses	(15,486)	(4,242)
Securities available for sale, total fair value	284,237	289,251
Securities available for sale, total unrealized losses	(16,650)	(19,798)
US Government Agencies Debt Securities [Member]
Securities available for sale, less than 12 months, fair value	1,491	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	1,491	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	54,208	157,264
Securities available for sale, less than 12 months, unrealized losses	(554)	(4,353)
Securities available for sale, 12 months or longer, fair value	106,906	0
Securities available for sale, 12 months or longer, unrealized losses	(2,815)	0
Securities available for sale, total fair value	161,114	157,264
Securities available for sale, total unrealized losses	(3,369)	(4,353)
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale, less than 12 months, fair value	7,463	12,347
Securities available for sale, less than 12 months, unrealized losses	(60)	(192)
Securities available for sale, 12 months or longer, fair value	1,169	0
Securities available for sale, 12 months or longer, unrealized losses	(20)	0
Securities available for sale, total fair value	8,632	12,347
Securities available for sale, total unrealized losses	(80)	(192)
Corporate Debt Securities [Member]
Securities available for sale, less than 12 months, fair value	2,972	32,368
Securities available for sale, less than 12 months, unrealized losses	(28)	(2,172)
Securities available for sale, 12 months or longer, fair value	26,807	2,489
Securities available for sale, 12 months or longer, unrealized losses	(1,736)	(17)
Securities available for sale, total fair value	29,779	34,857
Securities available for sale, total unrealized losses	(1,764)	(2,189)
Mortgage-backed Agency Securities [Member]
Securities available for sale, less than 12 months, fair value	10,009	64,993
Securities available for sale, less than 12 months, unrealized losses	(513)	(8,824)
Securities available for sale, 12 months or longer, fair value	73,212	18,305
Securities available for sale, 12 months or longer, unrealized losses	(10,915)	(4,225)
Securities available for sale, total fair value	83,221	83,298
Securities available for sale, total unrealized losses	$ (11,428)	$ (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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