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Note 3 - Debt Securities (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

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

						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
2024:
U.S. government treasuries		$	176,483			$	8			$	(8,776	)		$	167,715
U.S. government agencies			88,625				2				(5,194	)			83,433
U.S. government mortgage-backed securities			103,964				6				(12,920	)			91,050
State and political subdivisions			266,118				35				(20,591	)			245,562
Corporate bonds			65,338				7				(4,592	)			60,753
Total		$	700,528			$	58			$	(52,073	)		$	648,513

						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

Investments Classified by Contractual Maturity Date [Table Text Block]

		Amortized				Estimated
		Cost				Fair Value
Due in one year or less		$	105,290			$	103,737
Due after one year through five years			374,000				350,187
Due after five years through ten years			109,174				96,627
Due after ten years			8,100				6,912
		$	596,564			$	557,463
U.S. government mortgage-backed securities			103,964				91,050
Total		$	700,528			$	648,513

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

		2024				2023
Proceeds from sales of securities available-for-sale		$	2,049			$	2,069
Gross realized gains on securities available-for-sale			-				73
Gross realized losses on securities available-for-sale			(165	)			(38	)

Gain (Loss) on Securities [Table Text Block]

2024:		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		$	5,466			$	(43	)			2			$	159,321			$	(8,733	)			94			$	164,787			$	(8,776	)
U.S. government agencies			3,953				(34	)			2				77,166				(5,160	)			70				81,119				(5,194	)
U.S. government mortgage-backed securities			3,740				(64	)			5				86,870				(12,856	)			154				90,610				(12,920	)
State and political subdivisions			13,944				(253	)			25				226,201				(20,338	)			440				240,145				(20,591	)
Corporate bonds			3,153				(27	)			4				56,604				(4,565	)			74				59,757				(4,592	)
Total		$	30,256			$	(421	)			38			$	606,162			$	(51,652	)			832			$	636,418			$	(52,073	)

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	)

X

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Tabular disclosure of realized and unrealized gain (loss) on investment in security.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(9)(a))
-Publisher FASB
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-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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