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Note 2 - Debt Securities (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Unrealized Gain (Loss) on Investments [Table Text Block]

						Gross				Gross
		Amortized				Unrealized				Unrealized				Market
		Cost				Gain				Loss				Value
		(In Thousands)
December 31, 2023
Debt Securities Available-for-Sale
U.S. Treasury Securities		$	340,556			$	251			$	-			$	340,807
Mortgage-backed securities			241,458				6				(25,979	)			215,485
State and municipal securities			11,400				1				(1,178	)			10,223
Corporate debt			375,676				-				(42,009	)			333,667
Total		$	969,090			$	258			$	(69,166	)		$	900,183
Debt Securities Held-to-Maturity
U.S. Treasury Securities		$	508,985			$	-			$	(24,718	)		$	484,267
Mortgage-backed securities			465,615				3				(50,025	)			415,593
State and municipal securities			8,063				-				(732	)			7,331
Total		$	982,664			$	3			$	(75,475	)		$	907,191
December 31, 2022
Debt Securities Available-for-Sale
U.S. Treasury Securities		$	3,002			$	-			$	(33	)		$	2,969
Government Agency Securities			9				-				-				9
Mortgage-backed securities			282,480				5				(32,782	)			249,703
State and municipal securities			15,205				1				(1,597	)			13,609
Corporate debt			406,680				-				(28,155	)			378,525
Total		$	707,376			$	6			$	(62,567	)		$	644,815
Debt Securities Held-to-Maturity
U.S. Treasury Securities		$	507,151			$	-			$	(36,197	)		$	470,954
Mortgage-backed securities			518,929				7				(60,960	)			457,976
State and municipal securities			8,041				-				(1,018	)			7,023
Total		$	1,034,121			$	7			$	(98,175	)		$	935,953

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

		December 31, 2023								December 31, 2022
		Amortized Cost				Market Value				Amortized Cost				Market Value
		(In Thousands)
Debt securities available-for-sale
Due within one year		$	350,400			$	350,396			$	24,712			$	24,432
Due from one to five years			70,016				67,334				58,554				57,092
Due from five to ten years			304,216				264,892				338,630				311,100
Due after ten years			3,000				2,076				3,000				2,488
Mortgage-backed securities			241,458				215,485				282,480				249,703
		$	969,090			$	900,183			$	707,376			$	644,815
Debt securities held-to-maturity
Due within one year		$	260,047			$	257,835			$	250			$	250
Due from one to five years			203,481				185,741				386,465				366,095
Due from five to ten years			53,521				48,022				128,477				111,632
Mortgage-backed securities			465,615				415,593				518,929				457,976
		$	982,664			$	907,191			$	1,034,121			$	935,953

Gain (Loss) on Securities [Table Text Block]

		Less Than Twelve Months								Twelve Months or More								Total
		Gross								Gross								Gross
		Unrealized								Unrealized								Unrealized
		Losses				Fair Value				Losses				Fair Value				Losses				Fair Value
		(In Thousands)
December 31, 2023
Debt Securities available-for-sale
Mortgage-backed securities		$	(6	)		$	704			$	(25,973	)		$	214,393			$	(25,979	)		$	215,097
State and municipal securities			-				-				(1,178	)			9,777				(1,178	)			9,777
Corporate debt			(794	)			15,141				(41,214	)			311,666				(42,009	)			326,807
Total		$	(801	)		$	15,845			$	(68,365	)		$	535,836			$	(69,166	)		$	551,681
Debt Securities held-to-maturity
U.S. Treasury Securities		$	-			$	-			$	(24,718	)		$	484,267			$	(24,718	)		$	484,267
Mortgage-backed securities			(1	)			430				(50,024	)			411,585				(50,025	)			412,015
State and municipal securities			-				-				(732	)			7,081				(732	)			7,081
Total		$	(1	)		$	430			$	(75,474	)		$	902,933			$	(75,475	)		$	903,363
December 31, 2022
Debt Securities available-for-sale
U.S. Treasury Securities		$	(33	)		$	2,969			$	-			$	-			$	(33	)		$	2,969
Government Agency Securities			-				9				-				-				-				9
Mortgage-backed securities		$	(3,473	)		$	60,234			$	(29,309	)		$	189,109			$	(32,782	)		$	249,343
State and municipal securities			(186	)			5,283				(1,411	)			7,880				(1,597	)			13,163
Corporate debt			(18,566	)			304,254				(9,589	)			63,411				(28,155	)			367,666
Total		$	(22,258	)		$	372,749			$	(40,309	)		$	260,400			$	(62,567	)		$	633,149
U.S. Treasury Securities		$	(12,662	)		$	295,383			$	(23,537	)		$	175,570			$	(36,197	)		$	470,953
Mortgage-backed securities			(31,367	)			278,746				(29,592	)			174,842				(60,960	)			453,588
State and municipal securities			(544	)			4,443				(474	)			2,330				(1,018	)			6,773
Total		$	(44,573	)		$	578,572			$	(53,603	)		$	352,742			$	(98,175	)		$	931,314

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

		Years Ended December 31,
		2023				2022				2021
		(In Thousands)
Sale and call proceeds		$	-			$	75,036			$	6,272
Gross realized gains		$	-			$	-			$	620
Gross realized losses			-				(6,168	)			-
Net realized (loss) gain		$	-			$	(6,168	)		$	620

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