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Note 7 - Investment Securities (Tables)

9 Months Ended

Sep. 30, 2024

Notes Tables

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

		*September 30, 2024*
						*Gross*				*Gross*
		*Amortized*				*Unrealized*				*Unrealized*
		*Cost*				*Gains*				*Losses*				*Fair Value*
		(In thousands)
Securities AFS
U.S. treasury securities		$	494,517			$	494			$	—			$	495,011
U.S. government agency entities			10,180				61				116				10,125
Mortgage-backed securities			821,023				395				86,882				734,536
Collateralized mortgage obligations			28,663				—				2,229				26,434
Corporate debt securities			248,313				299				6,362				242,250
Total		$	1,602,696			$	1,249			$	95,589			$	1,508,356

		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]

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

Due in one year or less		$	564,646			$	564,312
Due after one year through five years			182,986				177,692
Due after five years through ten years			119,016				113,945
Due after ten years			736,048				652,407
Total		$	1,602,696			$	1,508,356

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

		*September 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. government agency entities		$	1,182			$	1			$	2,223			$	115			$	3,405			$	116
Mortgage-backed securities			8				—				701,624				86,882				701,632				86,882
Collateralized mortgage obligations			—				—				26,434				2,229				26,434				2,229
Corporate debt securities			19,974				26				146,866				6,336				166,840				6,362
Total		$	21,164			$	27			$	877,147			$	95,562			$	898,311			$	95,589

		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