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Note 3 - Securities (Tables)

9 Months Ended

Sep. 30, 2025

Notes Tables

Debt Securities, Available-for-Sale [Table Text Block]

						Gross				Gross
		Amortized				Unrealized				Unrealized
(In Thousands of Dollars)		Cost				Gains				Losses				Fair Value
September 30, 2025
U.S. Treasury and U.S. government sponsored entities		$	105,155			$	34			$	(10,237	)		$	94,952
State and political subdivisions			590,327				1,916				(96,449	)			495,794
Corporate bonds			16,674				167				(370	)			16,471
Mortgage-backed securities			622,160				677				(87,078	)			535,759
Collateralized mortgage obligations			160,784				1,336				(5,468	)			156,652
Small Business Administration			2,303				0				(165	)			2,138
Totals		$	1,497,403			$	4,130			$	(199,767	)		$	1,301,766

						Gross				Gross
		Amortized				Unrealized				Unrealized
(In Thousands of Dollars)		Cost				Gains				Losses				Fair Value
December 31, 2024
U.S. Treasury and U.S. government sponsored entities		$	132,292			$	0			$	(17,185	)		$	115,107
State and political subdivisions			609,950				1,294				(106,364	)			504,880
Corporate bonds			17,849				172				(573	)			17,448
Mortgage-backed securities			605,350				34				(112,517	)			492,867
Collateralized mortgage obligations			142,525				85				(8,834	)			133,776
Small Business Administration			2,715				0				(240	)			2,475
Totals		$	1,510,681			$	1,585			$	(245,713	)		$	1,266,553

Gain (Loss) on Securities [Table Text Block]

		Three Months Ended								Nine Months Ended
		September 30,								September 30,
(In Thousands of Dollars)		2025				2024				2025				2024
Proceeds		$	28,750			$	4,109			$	52,651			$	48,865
Gross gains			0				0				0				17
Gross losses			(960	)			(421	)			(2,294	)			(2,697	)

Investments Classified by Contractual Maturity Date [Table Text Block]

		September 30, 2025
(In Thousands of Dollars)		Amortized Cost				Fair Value
Maturity
Within one year		$	3,704			$	3,693
One to five years			52,132				48,284
Five to ten years			166,010				153,720
Beyond ten years			490,310				401,520
Mortgage-backed, collateralized mortgage obligations and Small Business Administration securities			785,247				694,549
Total		$	1,497,403			$	1,301,766

Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]

		Less than 12 Months								12 Months or Longer								Total
		Fair				Unrealized				Fair				Unrealized				Fair				Unrealized
(In Thousands of Dollars)		Value				Loss				Value				Loss				Value				Loss
September 30, 2025
U.S. Treasury and U.S. government sponsored entities		$	1,060			$	(3	)		$	92,690			$	(10,234	)		$	93,750			$	(10,237	)
State and political subdivisions			21,246				(1,249	)			420,822				(95,200	)			442,068				(96,449	)
Corporate bonds			4,247				(38	)			8,029				(332	)			12,276				(370	)
Mortgage-backed securities			862				(23	)			444,752				(87,055	)			445,614				(87,078	)
Collateralized mortgage obligations			42,985				(301	)			50,675				(5,167	)			93,660				(5,468	)
Small Business Administration			0				0				2,138				(165	)			2,138				(165	)
Total		$	70,400			$	(1,614	)		$	1,019,106			$	(198,153	)		$	1,089,506			$	(199,767	)

		Less than 12 Months								12 Months or Longer								Total
		Fair				Unrealized				Fair				Unrealized				Fair				Unrealized
(In Thousands of Dollars)		Value				Loss				Value				Loss				Value				Loss
December 31, 2024
U.S. Treasury and U.S. government sponsored entities		$	4,592			$	(320	)		$	110,515			$	(16,865	)		$	115,107			$	(17,185	)
State and political subdivisions			66,436				(4,946	)			400,911				(101,418	)			467,347				(106,364	)
Corporate bonds			4,303				(146	)			8,568				(427	)			12,871				(573	)
Mortgage-backed securities			30,143				(365	)			460,172				(112,152	)			490,315				(112,517	)
Collateralized mortgage obligations			65,046				(2,210	)			51,405				(6,624	)			116,451				(8,834	)
Small Business Administration			0				0				2,475				(240	)			2,475				(240	)
Total		$	170,520			$	(7,987	)		$	1,034,046			$	(237,726	)		$	1,204,566			$	(245,713	)

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