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Note 3 - Investment Securities (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]

		*As of December 31, 2024*
						*Gross*				*Gross*
		*Amortized*				*Unrealized*				*Unrealized*
		*Cost*				*Gains*				*Losses*				*Fair Value*
		(In thousands)
Securities AFS
U.S. treasury securities		$	621,212			$	250			$	—			$	621,462
U.S. government agency entities			9,226				50				127				9,149
Mortgage-backed securities			797,145				67				113,196				684,016
Collateralized mortgage obligations			27,747				—				3,191				24,556
Corporate debt securities			213,331				145				5,531				207,945
Total		$	1,668,661			$	512			$	122,045			$	1,547,128

		*As of December 31, 2023*
						*Gross*				*Gross*
		*Amortized*				*Unrealized*				*Unrealized*
		*Cost*				*Gains*				*Losses*				*Fair Value*
		(In thousands)
Securities AFS
U.S. treasury securities		$	495,167			$	153			$	20			$	495,300
U.S. government agency entities			48,282				117				230				48,169
Mortgage-backed securities			892,942				223				106,442				786,723
Collateralized mortgage obligations			31,238				—				3,194				28,044
Corporate debt securities			258,451				22				12,139				246,334
Total		$	1,726,080			$	515			$	122,025			$	1,604,570

Investments Classified by Contractual Maturity Date [Table Text Block]

		*Securities AFS*
		*As of December 31, 2024*
		*Amortized Cost*				*Fair Value*
		(In thousands)
Due in one year or less		$	671,499			$	671,217
Due after one year through five years			169,826				164,819
Due after five years through ten years			109,494				102,445
Due after ten years			717,842				608,647
Total		$	1,668,661			$	1,547,128

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

		*As of December 31, 2024*
		*Less than 12 months*								*12 months or longer*								*Total*
		*Fair*				*Gross Unrealized*				*Fair*				*Gross Unrealized*				*Fair*				*Gross Unrealized*
		*Value*				*Losses*				*Value*				*Losses*				*Value*				*Losses*
		(In thousands)

Securities AFS
U.S. government agency entities		$	4,199			$	8			$	2,108			$	119			$	6,307			$	127
Mortgage-backed securities			29,955				959				653,236				112,237				683,191				113,196
Collateralized mortgage obligations			—				—				24,556				3,191				24,556				3,191
Corporate debt securities			24,900				100				127,744				5,431				152,644				5,531
Total		$	59,054			$	1,067			$	807,644			$	120,978			$	866,698			$	122,045

		*As of December 31, 2023*
		*Less than 12 months*								*12 months or longer*								*Total*
		*Fair*				*Gross Unrealized*				*Fair*				*Gross Unrealized*				*Fair*				*Gross Unrealized*
		*Value*				*Losses*				*Value*				*Losses*				*Value*				*Losses*
		(In thousands)

Securities AFS
U.S. treasury securities		$	49,831			$	20			$	—			$	—			$	49,831			$	20
U.S. government agency entities			18,301				108				1,313				122				19,614				230
Mortgage-backed securities			—				—				768,274				106,442				768,274				106,442
Collateralized mortgage obligations			—				—				28,044				3,194				28,044				3,194
Corporate debt securities			64,448				552				166,864				11,587				231,312				12,139
Total		$	132,580			$	680			$	964,495			$	121,345			$	1,097,075			$	122,025