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Note 6 - Debt Securities (Tables)

9 Months Ended

Sep. 30, 2024

Notes Tables

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

2024:						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
U.S. government treasuries		$	186,405			$	218			$	(7,840	)		$	178,783
U.S. government agencies			97,673				142				(4,064	)			93,751
U.S. government mortgage-backed securities			104,041				7				(10,142	)			93,906
State and political subdivisions			270,717				135				(14,470	)			256,382
Corporate bonds			69,035				57				(3,319	)			65,773
		$	727,871			$	559			$	(39,835	)		$	688,595

2023:						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
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
		$	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		$	106,029			$	104,557
Due after one year through five years			380,712				364,244
Due after five years through ten years			128,989				118,358
Due after ten years			8,100				7,530
		$	623,830			$	594,689
U.S. government mortgage-backed securities			104,041				93,906
Total		$	727,871			$	688,595

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

		Three Months Ended								Nine Months Ended
		September 30,								September 30,
		2024				2023				2024				2023
Proceeds from sales of securities available-for-sale		$	-			$	716			$	2,049			$	2,069
Gross realized gains on securities available-for-sale			-				62				-				73
Gross realized losses on securities available-for-sale			-				(34	)			(165	)			(38	)

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
2024:		Fair Value				Losses				Securities				Fair Value				Losses				Securities				Fair Value				Losses
Securities available-for-sale:
U.S. government treasuries		$	-			$	-				-			$	170,184			$	(7,840	)			102			$	170,184			$	(7,840	)
U.S. government agencies			-				-				-				85,317				(4,064	)			73				85,317				(4,064	)
U.S. government mortgage-backed securities			-				-				-				93,339				(10,142	)			154				93,339				(10,142	)
State and political subdivisions			2,810				(14	)			8				236,197				(14,456	)			447				239,007				(14,470	)
Corporate bonds			-				-				-				61,554				(3,319	)			78				61,554				(3,319	)
		$	2,810			$	(14	)			8			$	646,591			$	(39,821	)			854			$	649,401			$	(39,835	)

		Less than 12 Months												12 Months or More												Total
		Estimated				Unrealized				No. of				Estimated				Unrealized				No. of				Estimated				Unrealized
2023:		Fair Value				Losses				Securities				Fair Value				Losses				Securities				Fair 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	)
		$	14,624			$	(204	)			28			$	706,936			$	(62,245	)			912			$	721,560			$	(62,449	)

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
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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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