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Note 6 - Debt Securities (Tables)

3 Months Ended

Mar. 31, 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		$	213,801			$	8			$	(13,481	)		$	200,328
U.S. government agencies			99,124				2				(6,861	)			92,265
U.S. government mortgage-backed securities			112,244				1				(14,086	)			98,159
State and political subdivisions			285,410				55				(22,610	)			262,855
Corporate bonds			75,102				5				(5,509	)			69,598
		$	785,681			$	71			$	(62,547	)		$	723,205

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		$	93,493			$	91,733
Due after one year through five years			387,739				361,233
Due after five years through ten years			183,240				163,988
Due after ten years			8,965				8,092
		$	673,437			$	625,046
U.S. government mortgage-backed securities			112,244				98,159
Total		$	785,681			$	723,205

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

		Three Months Ended
		March 31,
		2024				2023
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
2024:		Estimated Fair Value				Unrealized Losses				No. of Securities				Estimated Fair Value				Unrealized Losses				No. of Securities				Estimated Fair Value				Unrealized Losses

Securities available-for-sale:
U.S. government treasuries		$	4,491			$	(19	)			2			$	193,044			$	(13,462	)			118			$	197,535			$	(13,481	)
U.S. government agencies			1,913				(18	)			2				85,896				(6,843	)			75				87,809				(6,861	)
U.S. government mortgage-backed securities			124				(1	)			1				97,580				(14,085	)			155				97,704				(14,086	)
State and political subdivisions			9,083				(125	)			20				247,740				(22,485	)			473				256,823				(22,610	)
Corporate bonds			3,115				(110	)			4				65,492				(5,399	)			81				68,607				(5,509	)
		$	18,726			$	(273	)			29			$	689,752			$	(62,274	)			902			$	708,478			$	(62,547	)

		Less than 12 Months												12 Months or More												Total
2023:		Estimated Fair Value				Unrealized Losses				No. of Securities				Estimated Fair Value				Unrealized Losses				No. of Securities				Estimated Fair Value				Unrealized 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	)