Note 13 - Fair Value Measurements and Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	March 31, 2022
	Fair Value Measurements Using						Total Fair Value
	Level 1		Level 2		Level 3		Measurements
	(In thousands)
Assets
Securities available-for-sale
U.S. Treasury securities	$	119,748	$	—	$	—	$	119,748
U.S. government agency entities		—		83,216		—		83,216
Mortgage-backed securities		—		873,505		—		873,505
Collateralized mortgage obligations		—		8,388		—		8,388
Corporate debt securities		—		134,684		—		134,684
Total securities available-for-sale		119,748		1,099,793		—		1,219,541
Equity securities
Mutual funds		1,857		—		—		1,857
Preferred stock of government sponsored entities		5,940		—		—		5,940
Other equity securities		19,943		—		—		19,943
Total equity securities		27,740		—		—		27,740
Warrants		—		—		24		24
Interest rate swaps		—		38,377		—		38,377
Foreign exchange contracts		—		1,376		—		1,376
Total assets	$	147,488	$	1,139,546	$	24	$	1,287,058
Liabilities
Interest rate swaps	$	—	$	22,983	$	—	$	22,983
Foreign exchange contracts		—		142		—		142
Total liabilities	$	—	$	23,125	$	—	$	23,125

	December 31, 2021
	Fair Value Measurements Using						Total Fair Value
	Level 1		Level 2		Level 3		Measurements
	(In thousands)
Assets
Securities available-for-sale
U.S. government agency entities	$	—	$	87,509	$	—	$	87,509
Mortgage-backed securities		—		888,665		—		888,665
Collateralized mortgage obligations		—		9,117		—		9,117
Corporate debt securities		—		142,018		—		142,018
Total securities available-for-sale		—		1,127,309		—		1,127,309
Equity securities
Mutual funds		6,230		—		—		6,230
Preferred stock of government sponsored entities		1,811		—		—		1,811
Other equity securities		14,278		—		—		14,278
Total equity securities		22,319		—		—		22,319
Warrants		—		—		23		23
Interest rate swaps		—		10,090		—		10,090
Foreign exchange contracts		—		1,113		—		1,113
Total assets	$	22,319	$	1,138,512	$	23	$	1,160,854
Liabilities
Interest rate swaps	$	—	$	12,642	$	—	$	12,642
Foreign exchange contracts		—		327		—		327
Total liabilities	$	—	$	12,969	$	—	$	12,969

Fair Value Measurements, Nonrecurring [Table Text Block]

	As of March 31, 2022								Total Losses
	Fair Value Measurements Using						Total Fair Value		For the Three Months Ended
	Level 1		Level 2		Level 3		Measurements		March 31, 2022		March 31, 2021
	(In thousands)
Assets
Non accrual loans by type:
Commercial loans	$	—	$	—	$	19,688	$	19,688	$	—	$	—
Commercial mortgage loans		—		—		13,665		13,665		—		—
Residential mortgage loans and equity lines		—		—		6,179		6,179		—		—
Total non accrual loans		—		—		39,532		39,532		—		—
Other real estate owned (1)		—		—		4,269		4,269		—		—
Investments in venture capital		—		—		947		947		—		71
Total assets	$	—	$	—	$	44,748	$	44,748	$	-	$	71

	As of December 31, 2021								Total Losses
	Fair Value Measurements Using						Total Fair Value		For the Twelve Months Ended
	Level 1		Level 2		Level 3		Measurements		December 31, 2021		December 31, 2020
	(In thousands)
Assets
Non accrual loans by type:
Commercial loans	$	—	$	—	$	4,327	$	4,327	$	1,012	$	7,012
Commercial mortgage loans		—		—		13,335		13,335		—		—
Residential mortgage loans and equity lines		—		—		5,243		5,243		—		—
Total non accrual loans		—		—		22,905		22,905		1,012		7,012
Other real estate owned (1)		—		—		4,589		4,589		17		717
Investments in venture capital		—		—		952		952		143		107
Total assets	$	—	$	—	$	28,446	$	28,446	$	1,172	$	7,836

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

	March 31, 2022				December 31, 2021
	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
	(In thousands)
Financial Assets
Cash and due from banks	$	138,979	$	138,979	$	134,141	$	134,141
Short-term investments		1,119,105		1,119,105		2,315,563		2,315,563
Securities available-for-sale		1,219,541		1,219,541		1,127,309		1,127,309
Loans, net		17,398,357		17,184,664		16,202,001		16,499,869
Equity securities		27,740		27,740		22,319		22,319
Investment in Federal Home Loan Bank stock		17,250		17,250		17,250		17,250
Warrants		24		24		23		23

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Foreign exchange contracts	$	208,263	$	1,376	$	181,997	$	1,113
Interest rate swaps		989,849		38,377		904,635		10,090

	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
Financial Liabilities
Deposits	$	18,060,261	$	18,039,184	$	18,058,842	$	18,051,720
Advances from Federal Home Loan Bank		20,000		20,444		20,000		21,279
Other borrowings		23,108		18,803		23,145		18,945
Long-term debt		119,136		55,126		119,136		62,274

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Option contracts	$	—	$	—	$	676	$	2,911
Foreign exchange contracts		27,587		142		51,782		327
Interest rate swaps		852,894		22,983		872,400		12,642

	Notional					Notional
	Amount		Fair Value			Amount		Fair Value
Off-Balance Sheet Financial Instruments
Commitments to extend credit	$	3,261,172	$	(13,200	)	$	3,297,362	$	(12,594	)
Standby letters of credit		284,608		(2,648	)		266,490		(2,640	)
Other letters of credit		21,981		(20	)		16,652		(13	)

Schedule Of Fair Value Of Financial Instruments [Table Text Block]

	As of March 31, 2022
	Estimated
	Fair Value
	Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	138,979	$	138,979	$	—	$	—
Short-term investments		1,119,105		1,119,105		—		—
Securities available-for-sale		1,219,541		119,748		1,099,793		—
Loans, net		17,184,664		—		—		17,184,664
Equity securities		27,740		27,740		—		—
Investment in Federal Home Loan Bank stock		17,250		—		17,250		—
Warrants		24		—		—		24
Financial Liabilities
Deposits		18,039,184		—		—		18,039,184
Advances from Federal Home Loan Bank		20,444		—		20,444		—
Other borrowings		18,803		—		—		18,803
Long-term debt		55,126		—		55,126		—

	As of December 31, 2021
	Estimated
	Fair Value
	Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	134,141	$	134,141	$	—	$	—
Short-term investments		2,315,563		2,315,563		—		—
Securities available-for-sale		1,127,309		—		1,127,309		—
Loans, net		16,499,869		—		—		16,499,869
Equity securities		22,319		22,319		—		—
Investment in Federal Home Loan Bank stock		17,250		—		17,250		—
Warrants		23		—		—		23
Financial Liabilities
Deposits		18,051,720		—		—		18,051,720
Advances from Federal Home Loan Bank		21,279		—		21,279		—
Other borrowings		18,945		—		—		18,945
Long-term debt		62,274		—		62,274		—