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Note 4 - Securities (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

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

						Gross				Gross
		Amortized				Unrealized				Unrealized				Market
		Cost				Gain				Loss				Value
March 31, 2024		(In Thousands)
Debt Securities Available-for-Sale
U.S. Treasury Securities		$	494,156			$	10			$	(197	)		$	493,969
Mortgage-backed securities			281,343				249				(26,677	)			254,915
State and municipal securities			11,142				1				(1,186	)			9,958
Corporate debt			352,684				60				(37,657	)			315,086
Total		$	1,139,325			$	320			$	(65,716	)		$	1,073,929
Debt Securities Held-to-Maturity
U.S. Treasury Securities		$	393,932			$	-			$	(25,065	)		$	368,868
Mortgage-backed securities			465,695				5				(56,634	)			409,066
State and municipal securities			8,069				-				(733	)			7,336
Total		$	867,696			$	5			$	(82,431	)		$	785,270
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

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

		March 31, 2024								December 31, 2023
		Amortized Cost				Market Value				Amortized Cost				Market Value
		(In Thousands)
Debt securities available-for-sale
Due within one year		$	430,857			$	430,760			$	350,400			$	350,396
Due from one to five years			132,967				129,779				70,016				67,334
Due from five to ten years			291,157				256,407				304,216				264,893
Due after ten years			3,000				2,068				3,000				2,076
Mortgage-backed securities			281,343				254,915				241,458				215,485
		$	1,139,325			$	1,073,929			$	969,090			$	900,183
Debt securities held-to-maturity
Due within one year		$	144,940			$	144,283			$	260,047			$	257,835
Due from one to five years			253,772				229,043				203,481				185,741
Due from five to ten years			3,289				2,878				53,521				48,022
Mortgage-backed securities			465,695				409,066				465,615				415,593
		$	867,696			$	785,270			$	982,664			$	907,191

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)
March 31, 2024
Debt Securities available-for-sale
U.S. Treasury Securities		$	(197	)		$	479,762			$	-			$	-			$	(197	)		$	479,762
Government Agency Securities			-				-				-				-				-				-
Mortgage-backed securities			(2	)			161				(26,674	)			205,195				(26,677	)			205,356
State and municipal securities			-				-				(1,186	)			9,512				(1,186	)			9,512
Corporate debt			(2,392	)			11,108				(35,265	)			294,003				(37,657	)			305,111
Total		$	(2,591	)		$	491,031			$	(63,125	)		$	508,710			$	(65,716	)		$	999,741
Debt Securities held-to-maturity
U.S. Treasury Securities		$	-			$	-			$	(25,065	)		$	368,868			$	(25,065	)		$	368,868
Mortgage-backed securities			(162	)			9,895				(56,471	)			393,887				(56,634	)			405,323
State and municipal securities			-				-				(733	)			7,086				(733	)			7,086
Total		$	(162	)		$	9,895			$	(82,269	)		$	771,382			$	(82,431	)		$	779,735
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

X

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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Tabular disclosure of realized and unrealized gain (loss) on investment in security.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(9)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

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