Note 11 - Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

	At December 31, 2023
	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3) (1)
	(In thousands)
Debt securities available for sale:
Agency residential MBS	$	239,454	$	-	$	239,454	$	-
Securities of U.S. Government sponsored entities		294,919		-		294,919		-
Obligations of states and political subdivisions		71,283		-		71,283		-
Corporate securities		1,909,548		-		1,909,548		-
Collateralized loan obligations		1,484,597		-		1,484,597		-
Total debt securities available for sale	$	3,999,801	$	-	$	3,999,801	$	-

	At December 31, 2022
	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3) (1)
	(In thousands)
Debt securities available for sale:
Agency residential MBS	$	286,048	$	-	$	286,048	$	-
Securities of U.S. Government sponsored entities		290,853		-		290,853		-
Obligations of states and political subdivisions		82,004		-		82,004		-
Corporate securities		2,099,955		-		2,099,955		-
Collateralized loan obligations		1,572,883		-		1,572,883		-
Total debt securities available for sale	$	4,331,743	$	-	$	4,331,743	$	-

Fair Value Measurements, Nonrecurring [Table Text Block]

									For the
									Year Ended
	At December 31, 2023								December 31, 2023
	Carrying Value		Level 1		Level 2		Level 3		Total Losses
	(In thousands)
Loans:
Commercial real estate	$	110	$	-	$	-	$	110	$	-
Total assets measured at fair value on a nonrecurring basis	$	110	$	-	$	-	$	110	$	-

									For the
									Year Ended
	At December 31, 2022								December 31, 2022
	Carrying Value		Level 1		Level 2		Level 3		Total Losses
	(In thousands)
Loans:
Commercial real estate	$	225	$	-	$	-	$	225	$	-
Total assets measured at fair value on a nonrecurring basis	$	225	$	-	$	-	$	225	$	-

Fair Value, by Balance Sheet Grouping [Table Text Block]

	At December 31, 2023
	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2 )		Significant Unobservable Inputs (Level 3 )
Financial Assets:	(In thousands)
Cash and due from banks	$	190,314	$	190,314	$	190,314	$	-	$	-
Debt securities held to maturity		878,396		849,562		-		849,562		-
Loans		849,735		847,031		-		-		847,031
Financial Liabilities:
Deposits	$	5,474,267	$	5,474,012	$	-	$	5,377,465	$	96,547
Short-term borrowed funds		58,162		58,162		-		58,162		-

	At December 31, 2022
	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2 )		Significant Unobservable Inputs (Level 3 )
Financial Assets:	(In thousands)
Cash and due from banks	$	294,236	$	294,236	$	294,236	$	-	$	-
Debt securities held to maturity		915,913		873,511		-		873,511		-
Loans		938,204		905,720		-		-		905,720
Financial Liabilities:
Deposits	$	6,225,290	$	6,224,791	$	-	$	6,094,535	$	130,256
Short-term borrowed funds		57,792		57,792		-		57,792		-