Note 2 - Debt Securities (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

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

			Gross		Gross
	Amortized		Unrealized		Unrealized			Market
	Cost		Gain		Loss			Value
December 31, 2022	(In Thousands)
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
December 31, 2021
Debt Securities Available for Sale
U.S Treasury Securities	$	9,003	$	101	$	-		$	9,104
Government Agency Securities		6,022		19		-			6,041
Mortgage-backed securities		424,372		3,474		(2,685	)		425,161
State and municipal securities		21,531		173		(70	)		21,634
Corporate debt		369,618		11,659		(647	)		380,630
Total	$	830,546	$	15,426	$	(3,402	)	$	842,570
Debt Securities Held to Maturity
U.S. Treasury Securities	$	149,263	$	25	$	(668	)	$	148,620
Mortgage-backed securities		310,641		5,251		(1,271	)		314,621
State and municipal securities		3,053		2		(10	)		3,045
Total	$	462,957	$	5,278	$	(1,949	)	$	466,286

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

	December 31, 2022				December 31, 2021
	Amortized Cost		Market Value		Amortized Cost		Market Value
	(In Thousands)
Debt securities available for sale
Due within one year	$	24,712	$	24,432	$	32,913	$	33,232
Due from one to five years		58,554		57,092		31,760		32,307
Due from five to ten years		338,630		311,100		338,407		348,594
Due after ten years		3,000		2,488		3,094		3,276
Mortgage-backed securities		282,480		249,703		424,372		425,161
	$	707,376	$	644,815	$	830,546	$	842,570
Debt securities held to maturity
Due within one year	$	250	$	250	$	250	$	250
Due from one to five years		386,465		366,095		49,663		49,419
Due from five to ten years		128,477		111,632		102,403		101,996
Due after ten years		-		-		-		-
Mortgage-backed securities		518,929		457,976		310,641		314,621
	$	1,034,121	$	935,953	$	462,957	$	466,286

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, 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	)	$	633,150
Debt Securities held to maturity
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
December 31, 2021
Debt Securities available for sale
Mortgage-backed securities	$	(2,685	)	$	303,297	$	-		$	-	$	(2,685	)	$	303,297
State and municipal securities		(61	)		5,198		(9	)		228		(70	)		5,426
Corporate debt		(647	)		61,677		-			-		(647	)		61,677
Total	$	(3,393	)	$	370,172	$	(9	)	$	228	$	(3,402	)	$	370,400
Debt Securities held to maturity
U.S. Treasury Securities	$	(668	)	$	123,698	$	-		$	-	$	(668	)	$	123,698
Mortgage-backed securities		(1,271	)		134,192		-			-		(1,271	)		134,192
State and municipal securities		(10	)		482		-			-		(10	)		482
Total	$	(1,949	)	$	258,372	$	-		$	-	$	(1,949	)	$	258,372

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

	Years Ended December 31,
	2022			2021		2020
	(In Thousands)
Sale and call proceeds	$	75,036		$	6,272	$	27,857
Gross realized gains	$	-		$	620	$	-
Gross realized losses		(6,168	)		-		-
Net realized (loss) gain	$	(6,168	)	$	620	$	-