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Note 6 - Debt Securities (Tables)

6 Months Ended

Jun. 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		$	195,837			$	11			$	(12,242	)		$	183,606
U.S. government agencies			101,005				6				(6,502	)			94,509
U.S. government mortgage-backed securities			108,189				4				(14,045	)			94,148
State and political subdivisions			272,917				43				(22,073	)			250,887
Corporate bonds			73,067				-				(5,374	)			67,693
		$	751,015			$	64			$	(60,236	)		$	690,843

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		$	102,150			$	100,092
Due after one year through five years			385,150				358,508
Due after five years through ten years			147,426				130,796
Due after ten years			8,100				7,299
		$	642,826			$	596,695
U.S. government mortgage-backed securities			108,189				94,148
Total		$	751,015			$	690,843

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

		Three Months Ended								Six Months Ended
		June 30,								June 30,
		*2024*				*2023*				*2024*				*2023*
Proceeds from sales of securities available-for-sale		$	-			$	1,353			$	2,049			$	1,353
Gross realized gains on securities available-for-sale			-				11				-				11
Gross realized losses on securities available-for-sale			-				(4	)			(165	)			(4	)

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		$	4,518			$	(28	)			2			$	175,289			$	(12,214	)			108			$	179,807			$	(12,242	)
U.S. government agencies			1,957				(2	)			1				88,106				(6,500	)			77				90,063				(6,502	)
U.S. government mortgage-backed securities			121				(1	)			2				93,635				(14,044	)			155				93,756				(14,045	)
State and political subdivisions			4,556				(97	)			12				241,843				(21,976	)			467				246,399				(22,073	)
Corporate bonds			3,091				(117	)			3				64,602				(5,257	)			82				67,693				(5,374	)
		$	14,243			$	(245	)			20			$	663,475			$	(59,991	)			889			$	677,718			$	(60,236	)

		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	)