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Note 7 - Investment Securities (Tables)

6 Months Ended

Jun. 30, 2024

Notes Tables

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

		*June 30, 2024*
						*Gross*				*Gross*
		*Amortized*				*Unrealized*				*Unrealized*
		*Cost*				*Gains*				*Losses*				*Fair Value*
		(In thousands)
Securities AFS
U.S. treasury securities		$	545,093			$	—			$	93			$	545,000
U.S. government agency entities			11,063				65				118				11,010
U.S. government sponsored entities			79,785				—				51				79,734
Mortgage-backed securities			846,407				63				117,706				728,764
Collateralized mortgage obligations			29,551				—				3,472				26,079
Corporate debt securities			268,352				26				10,234				258,144
Total		$	1,780,251			$	154			$	131,674			$	1,648,731

		*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]

		*June 30, 2024*
		*Securities AFS*
		*Amortized Cost*				*Fair Value*
		(In thousands)

Due in one year or less		$	685,036			$	684,480
Due after one year through five years			210,194				200,598
Due after five years through ten years			129,557				120,163
Due after ten years			755,464				643,490
Total		$	1,780,251			$	1,648,731

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

		*June 30, 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. treasury securities		$	545,000			$	93			$	—			$	—			$	545,000			$	93
U.S. government agency entities			1,303				1				2,426				117				3,729				118
U.S. government sponsored entities			79,734				51				—				—				79,734				51
Mortgage-backed securities			16,029				245				711,787				117,461				727,816				117,706
Collateralized mortgage obligations			—				—				26,079				3,472				26,079				3,472
Corporate debt securities			64,857				209				178,261				10,025				243,118				10,234
Total		$	706,923			$	599			$	918,553			$	131,075			$	1,625,476			$	131,674

		*December 31, 2023*
		*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		$	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