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Note 7 - Investment Securities (Tables)

6 Months Ended

Jun. 30, 2025

Notes Tables

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

		*June 30, 2025*
						*Gross*				*Gross*
		*Amortized*				*Unrealized*				*Unrealized*
		*Cost*				*Gains*				*Losses*				*Fair Value*
		(In thousands)
Securities AFS
U.S. treasury securities		$	768,375			$	14			$	140			$	768,249
U.S. government agency entities			7,991				54				111				7,934
Mortgage-backed securities			751,160				102				92,831				658,431
Collateralized mortgage obligations			26,023				—				2,096				23,927
Corporate debt securities			193,154				79				3,341				189,892
Total		$	1,746,703			$	249			$	98,519			$	1,648,433

		*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

Investments Classified by Contractual Maturity Date [Table Text Block]

		*June 30, 2025*
		*Securities AFS*
		*Amortized Cost*				*Fair Value*
		(In thousands)

Due in one year or less		$	838,473			$	837,566
Due after one year through five years			153,104				149,740
Due after five years through ten years			72,971				69,984
Due after ten years			682,155				591,143
Total		$	1,746,703			$	1,648,433

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

		*June 30, 2025*
		*Less than 12 Months*								*12 Months or Longer*								*Total*
						*Gross*								*Gross*								*Gross*
		*Fair*				*Unrealized*				*Fair*				*Unrealized*				*Fair*				*Unrealized*
		*Value*				*Losses*				*Value*				*Losses*				*Value*				*Losses*
		(In thousands)

Securities AFS
U.S. treasury securities		$	570,370			$	140			$	—			$	—			$	570,370			$	140
U.S. government agency entities			2,332				2				2,845				109				5,177				111
Mortgage-backed securities			28,273				424				628,662				92,407				656,935				92,831
Collateralized mortgage obligations			—				—				23,927				2,096				23,927				2,096
Corporate debt securities			9,980				20				119,833				3,321				129,813				3,341
Total		$	610,955			$	586			$	775,267			$	97,933			$	1,386,222			$	98,519

		*December 31, 2024*
		*Less than 12 Months*								*12 Months or Longer*								*Total*
						*Gross*								*Gross*								*Gross*
		*Fair*				*Unrealized*				*Fair*				*Unrealized*				*Fair*				*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