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Note 5 - Debt Securities (Tables)

9 Months Ended

Sep. 30, 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		$	156,916			$	363			$	(4,410	)		$	152,869
U.S. government agencies			92,688				117				(2,872	)			89,933
U.S. government mortgage-backed securities			118,927				191				(8,636	)			110,482
State and political subdivisions			247,081				258				(11,054	)			236,285
Corporate bonds			63,606				114				(2,629	)			61,091
		$	679,218			$	1,043			$	(29,601	)		$	650,660

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		$	92,716			$	91,586
Due after one year through five years			370,875				357,222
Due after five years through ten years			94,597				89,267
Due after ten years			2,103				2,103
		$	560,291			$	540,178
U.S. government mortgage-backed securities			118,927				110,482
Total		$	679,218			$	650,660

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

		Three Months Ended								Nine Months Ended
		September 30,								September 30,
		*2025*				*2024*				*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		$	-			$	-				-			$	117,197			$	(4,410	)			68			$	117,197			$	(4,410	)
U.S. government agencies			13,331				(90	)			8				65,022				(2,782	)			56				78,353				(2,872	)
U.S. government mortgage-backed securities			10,919				(59	)			9				79,653				(8,577	)			147				90,572				(8,636	)
State and political subdivisions			2,274				(117	)			6				204,049				(10,937	)			389				206,323				(11,054	)
Corporate bonds			1,500				(7	)			2				52,036				(2,622	)			63				53,536				(2,629	)
		$	28,024			$	(273	)			25			$	517,957			$	(29,328	)			723			$	545,981			$	(29,601	)

		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	)