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Note 6 - Debt Securities (Tables)

3 Months Ended

Mar. 31, 2025

Notes Tables

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

2025:						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
U.S. government treasuries		$	165,789			$	55			$	(6,881	)		$	158,963
U.S. government agencies			90,704				24				(4,104	)			86,624
U.S. government mortgage-backed securities			100,340				15				(11,115	)			89,240
State and political subdivisions			262,297				57				(16,793	)			245,561
Corporate bonds			63,810				19				(3,801	)			60,028
		$	682,940			$	170			$	(42,694	)		$	640,416

2024:						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
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
		$	700,528			$	58			$	(52,073	)		$	648,513

Investments Classified by Contractual Maturity Date [Table Text Block]

		Amortized				Estimated
		Cost				Fair Value
Due in one year or less		$	101,088			$	99,775
Due after one year through five years			374,921				355,282
Due after five years through ten years			98,491				88,747
Due after ten years			8,100				7,372
		$	582,600			$	551,176
U.S. government mortgage-backed securities			100,340				89,240
Total		$	682,940			$	640,416

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

		Three Months Ended
		March 31,
		2025				2024
Proceeds from sales of securities available-for-sale		$	-			$	2,049
Gross realized gains on securities available-for-sale			-				-
Gross realized losses on securities available-for-sale			-				(165	)

Gain (Loss) on Securities [Table Text Block]

		Less than 12 Months												12 Months or More												Total
		Estimated				Unrealized				No. of				Estimated				Unrealized				No. of				Estimated				Unrealized
2025:		Fair Value				Losses				Securities				Fair Value				Losses				Securities				Fair Value				Losses
Securities available-for-sale:
U.S. government treasuries		$	3,903			$	(3	)			3			$	143,722			$	(6,878	)			83			$	147,625			$	(6,881	)
U.S. government agencies			5,391				(42	)			4				75,426				(4,062	)			67				80,817				(4,104	)
U.S. government mortgage-backed securities			2,659				(21	)			2				85,071				(11,094	)			152				87,730				(11,115	)
State and political subdivisions			13,742				(253	)			22				223,917				(16,540	)			441				237,659				(16,793	)
Corporate bonds			2,451				(10	)			3				55,842				(3,791	)			71				58,293				(3,801	)
		$	28,146			$	(329	)			34			$	583,978			$	(42,365	)			814			$	612,124			$	(42,694	)

		Less than 12 Months												12 Months or More												Total
		Estimated				Unrealized				No. of				Estimated				Unrealized				No. of				Estimated				Unrealized
2024:		Fair Value				Losses				Securities				Fair Value				Losses				Securities				Fair 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	)
		$	30,256			$	(421	)			38			$	606,162			$	(51,652	)			832			$	636,418			$	(52,073	)

X

- Definition

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
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

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-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(c))
-Publisher FASB
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+ References

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-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
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