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Note 3 - Debt Securities (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

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

						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
2023:
U.S. government treasuries		$	213,646			$	29			$	(13,587	)		$	200,088
U.S. government agencies			99,455				2				(6,842	)			92,615
U.S. government mortgage-backed securities			115,988				-				(14,124	)			101,864
State and political subdivisions			292,475				93				(22,677	)			269,891
Corporate bonds			77,139				11				(5,219	)			71,931
Total		$	798,703			$	135			$	(62,449	)		$	736,389

						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
2022:
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
Total		$	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		$	82,517			$	80,981
Due after one year through five years			395,006				370,101
Due after five years through ten years			196,227				175,993
Due after ten years			8,965				7,450
		$	682,715			$	634,525
U.S. government mortgage-backed securities			115,988				101,864
Total		$	798,703			$	736,389

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

		2023				2022
Proceeds from sales of securities available-for-sale		$	2,069			$	10,548
Gross realized gains on securities available-for-sale			73				60
Gross realized losses on securities available-for-sale			(38	)			(23	)

Gain (Loss) on Securities [Table Text Block]

2023:		Less than 12 Months												12 Months or More												Total
		Estimated				Gross								Estimated				Gross								Estimated				Gross
		Fair				Unrealized				No. of				Fair				Unrealized				No. of				Fair				Unrealized
		Value				Losses				Securities				Value				Losses				Securities				Value				Losses
Securities available for sale:
U.S. government treasuries		$	-			$	-				-			$	196,432			$	(13,587	)			121			$	196,432			$	(13,587	)
U.S. government agencies			1,986				(11	)			2				90,137				(6,831	)			78				92,123				(6,842	)
U.S. government mortgage-backed securities			467				(12	)			4				101,265				(14,112	)			155				101,732				(14,124	)
State and political subdivisions			9,054				(73	)			18				251,286				(22,604	)			474				260,340				(22,677	)
Corporate bonds			3,117				(108	)			4				67,816				(5,111	)			84				70,933				(5,219	)
Total		$	14,624			$	(204	)			28			$	706,936			$	(62,245	)			912			$	721,560			$	(62,449	)

2022:		Less than 12 Months												12 Months or More												Total
		Estimated				Gross								Estimated				Gross								Estimated				Gross
		Fair				Unrealized				No. of				Fair				Unrealized				No. of				Fair				Unrealized
		Value				Losses				Securities				Value				Losses				Securities				Value				Losses
Securities available for sale:
U.S. government treasuries		$	57,882			$	(3,960	)			45			$	147,215			$	(15,508	)			89				205,097				(19,468	)
U.S. government agencies			61,821				(4,293	)			51				38,492				(5,148	)			32				100,313				(9,441	)
U.S. government mortgage-backed securities			45,440				(4,393	)			104				70,854				(12,075	)			57				116,294				(16,468	)
State and political subdivisions			181,640				(14,556	)			335				97,907				(16,647	)			203				279,547				(31,203	)
Corporate bonds			59,293				(4,281	)			71				13,382				(2,739	)			23				72,675				(7,020	)
Total		$	406,076			$	(31,483	)			606			$	367,850			$	(52,117	)			404			$	773,926			$	(83,600	)