Note 8 - Investment Securities (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

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

	June 30, 2022
			Gross		Gross
	Amortized		Unrealized		Unrealized
	Cost		Gains		Losses		Fair Value
	(In thousands)
Securities Available-for-Sale
U.S. treasury securities	$	119,823	$	—	$	825	$	118,998
U.S. government agency entities		75,781		1,285		125		76,941
Mortgage-backed securities		932,753		108		88,398		844,463
Collateralized mortgage obligations		23,949		—		1,369		22,580
Corporate debt securities		183,987		—		12,398		171,589
Total	$	1,336,293	$	1,393	$	103,115	$	1,234,571

	December 31, 2021
			Gross		Gross
	Amortized		Unrealized		Unrealized
	Cost		Gains		Losses		Fair Value
	(In thousands)
Securities Available-for-Sale
U.S. government agency entities		86,475		1,169		135		87,509
Mortgage-backed securities		886,614		9,465		7,414		888,665
Collateralized mortgage obligations		9,547		—		430		9,117
Corporate debt securities		144,231		441		2,654		142,018
Total	$	1,126,867	$	11,075	$	10,633	$	1,127,309

Investments Classified by Contractual Maturity Date [Table Text Block]

	June 30, 2022
	Securities Available-For-Sale
	Amortized Cost		Fair Value
	(In thousands)
Due in one year or less	$	139,838	$	138,315
Due after one year through five years		146,693		135,240
Due after five years through ten years		147,294		144,903
Due after ten years		902,468		816,113
Total	$	1,336,293	$	1,234,571

Schedule of Unrealized Loss on Investments [Table Text Block]

	June 30, 2022
	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 Available-for-Sale
U.S. treasury securities	$	118,998	$	825	$	—	$	—	$	118,998	$	825
U.S. government agency entities		—		—		2,184		125		2,184		125
Mortgage-backed securities		705,908		65,450		132,913		22,948		838,821		88,398
Collateralized mortgage obligations		14,793		163		7,787		1,206		22,580		1,369
Corporate debt securities		134,070		9,243		37,520		3,155		171,590		12,398
Total	$	973,769	$	75,681	$	180,404	$	27,434	$	1,154,173	$	103,115

	December 31, 2021
	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 Available-for-Sale
U.S. government agency entities		—		—		2,337		135		2,337		135
Mortgage-backed securities		527,276		6,659		6,496		755		533,772		7,414
Collateralized mortgage obligations		8,989		417		128		13		9,117		430
Corporate debt securities		103,720		2,122		19,468		532		123,188		2,654
Total	$	639,985	$	9,198	$	28,429	$	1,435	$	668,414	$	10,633