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Note 6 - Debt Securities (Tables)

6 Months Ended

Jun. 30, 2023

Notes Tables

Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]

2023:						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
U.S. government treasuries		$	222,047			$	-			$	(17,891	)		$	204,156
U.S. government agencies			109,329				3				(8,769	)			100,563
U.S. government mortgage-backed securities			124,494				2				(15,430	)			109,066
State and political subdivisions			300,573				42				(27,160	)			273,455
Corporate bonds			77,715				-				(6,435	)			71,280
		$	834,158			$	47			$	(75,685	)		$	758,520

2022:						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
U.S. government treasuries		$	227,065			$	-			$	(19,468	)		$	207,597
U.S. government agencies			110,370				4				(9,441	)			100,933
U.S. government mortgage-backed securities			133,205				4				(16,468	)			116,741
State and political subdivisions			317,179				27				(31,203	)			286,003
Corporate bonds			82,177				7				(7,020	)			75,164
		$	869,996			$	42			$	(83,600	)		$	786,438

Investments Classified by Contractual Maturity Date [Table Text Block]

		Amortized				Estimated
		Cost				Fair Value
Due in one year or less		$	64,234			$	62,668
Due after one year through five years			409,635				378,356
Due after five years through ten years			226,621				200,824
Due after ten years			9,174				7,606
		$	709,664			$	649,454
U.S. government mortgage-backed securities			124,494				109,066
Total		$	834,158			$	758,520

Schedule of Realized Gain (Loss) [Table Text Block]

		Three Months Ended								Six Months Ended
		June 30,								June 30,
		2023				2022				2023				2022
Proceeds from sales of securities available-for-sale		$	1,353			$	-			$	1,353			$	535
Gross realized gains on securities available-for-sale			11				-				11				35
Gross realized losses on securities available-for-sale			(4	)			-				(4	)			-

Schedule of Unrealized Loss on Investments [Table Text Block]

		Less than 12 Months								12 Months or More								Total
2023:		Estimated Fair Value				Unrealized Losses				Estimated Fair Value				Unrealized Losses				Estimated Fair Value				Unrealized Losses
Securities available-for-sale:
U.S. government treasuries		$	3,901			$	(56	)		$	200,255			$	(17,835	)		$	204,156			$	(17,891	)
U.S. government agencies			6,830				(186	)			93,144				(8,583	)			99,974				(8,769	)
U.S. government mortgage-backed securities			2,212				(79	)			106,525				(15,351	)			108,737				(15,430	)
State and political subdivisions			49,104				(1,366	)			216,949				(25,794	)			266,053				(27,160	)
Corporate bonds			11,018				(371	)			58,762				(6,064	)			69,780				(6,435	)
		$	73,065			$	(2,058	)		$	675,635			$	(73,627	)		$	748,700			$	(75,685	)

		Less than 12 Months								12 Months or More								Total
2022:		Estimated Fair Value				Unrealized Losses				Estimated Fair Value				Unrealized Losses				Estimated Fair Value				Unrealized Losses
Securities available-for-sale:
U.S. government treasuries		$	57,882			$	(3,960	)		$	147,215			$	(15,508	)		$	205,097			$	(19,468	)
U.S. government agencies			61,821				(4,293	)			38,492				(5,148	)			100,313				(9,441	)
U.S. government mortgage-backed securities			45,440				(4,393	)			70,854				(12,075	)			116,294				(16,468	)
State and political subdivisions			181,640				(14,556	)			97,907				(16,647	)			279,547				(31,203	)
Corporate bonds			59,293				(4,281	)			13,382				(2,739	)			72,675				(7,020	)
		$	406,076			$	(31,483	)		$	367,850			$	(52,117	)		$	773,926			$	(83,600	)

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