Note 15 - Fair Value Measurements and Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

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

As of December 31, 2021	Fair Value Measurements Using						Total at
	Level 1		Level 2		Level 3		Fair Value
Assets	(In thousands)
Securities available-for-sale
U.S. Treasury securities	$	—	$	—	$	—	$	—
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

As of December 31, 2020	Fair Value Measurements Using						Total at
	Level 1		Level 2		Level 3		Fair Value
Assets	(In thousands)
Securities available-for-sale
U.S. Treasury securities	$	80,948	$	—	$	—	$	80,948
U.S. government agency entities		—		99,838		—		99,838
Mortgage-backed securities		—		727,068		—		727,068
Collateralized mortgage obligations		—		10,324		—		10,324
Corporate debt securities		—		118,372		—		118,372
Total securities available-for-sale		80,948		955,602		—		1,036,550
Equity securities
Mutual funds		6,413		—		—		6,413
Preferred stock of government sponsored entities		5,485		—		—		5,485
Other equity securities		11,846		—		—		11,846
Total equity securities		23,744		—		—		23,744
Warrants		—		—		21		21
Interest rate swaps		—		3,409		—		3,409
Foreign exchange contracts		—		4,658		—		4,658
Total assets	$	104,692	$	963,669	$	21	$	1,068,382
Liabilities
Interest rate swaps	$	—	$	10,286	$	—	$	10,286
Foreign exchange contracts		—		2,200		—		2,200
Total liabilities	$	—	$	12,486	$	—	$	12,486

Fair Value Measurements, Nonrecurring [Table Text Block]

	As of December 31, 2021								Total Losses
	Fair Value Measurements Using						Total at		For the Twelve Months Ended
	Level 1		Level 2		Level 3		Fair Value		December 31, 2021		December 31, 2020
Assets	(In thousands)
Impaired loans by type:
Commercial loans	$	—	$	—	$	4,327	$	4,327	$	1,012	$	7,012
Commercial mortgage loans		—		—		13,335		13,335		—		—
Residential mortgage and equity lines		—		—		5,243		5,243		—		—
Total impaired 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

	As of December 31, 2020								Total Losses/(Gains)
	Fair Value Measurements Using						Total at		For the Twelve Months Ended
	Level 1		Level 2		Level 3		Fair Value		December 31, 2020		December 31, 2019
Assets	(In thousands)
Impaired loans by type:
Commercial loans	$	—	$	—	$	5,342	$	5,342	$	7,012	$	—
Commercial mortgage loans		—		—		25,749		25,749		—		—
Residential mortgage and equity lines		—		—		4,307		4,307		—		—
Total impaired loans		—		—		35,398		35,398		7,012		—
Other real estate owned (1)		—		905		4,236		5,141		717		681
Investments in venture capital		—		—		1,381		1,381		107		167
Total assets	$	—	$	905	$	41,015	$	41,920	$	7,836	$	848

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

	December 31, 2021				December 31, 2020
	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
	(In thousands)
Financial Assets
Cash and due from banks	$	134,141	$	134,141	$	138,616	$	138,616
Short-term investments		2,315,563		2,315,563		1,282,462		1,282,462
Securities available-for-sale		1,127,309		1,127,309		1,036,550		1,036,550
Loans, net		16,202,001		16,499,869		15,475,364		16,103,471
Equity securities		22,319		22,319		23,744		23,744
Investment in Federal Home Loan Bank stock		17,250		17,250		17,250		17,250
Warrants		23		23		21		21

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Foreign exchange contracts	$	181,997	$	1,113	$	151,244	$	4,658
Interest rate swaps		904,635		10,090		96,889		3,409

Financial Liabilities	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
Deposits	$	18,058,842	$	18,051,720	$	16,109,401	$	16,125,808
Advances from Federal Home Loan Bank		20,000		21,279		150,000		155,133
Other borrowings		23,145		18,945		23,714		19,632
Long-term debt		119,136		62,274		119,136		65,487

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Option contracts	$	676	$	2,911	$	—	$	—
Foreign exchange contracts		51,782		327		132,813		2,200
Interest rate swaps		872,400		12,642		679,648		10,286

	Notional					Notional
	Amount		Fair Value			Amount		Fair Value
Off-Balance Sheet Financial Instruments
Commitments to extend credit	$	3,297,362	$	(12,594	)	$	2,977,528	$	(8,432	)
Standby letters of credit		266,490		(2,640	)		234,200		(1,630	)
Other letters of credit		16,652		(13	)		16,821		(16	)
Bill of lading guarantees		—		—			238		—

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

	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		—

	As of December 31, 2020
	Estimated
	Fair Value
	Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	138,616	$	138,616	$	—	$	—
Short-term investments		1,282,462		1,282,462		—		—
Securities available-for-sale		1,036,550		80,948		955,602		—
Loans, net (1)		16,103,471		—		—		16,103,471
Equity securities		23,744		23,744		—		—
Investment in Federal Home Loan Bank stock		17,250		—		17,250		—
Warrants		21		—		—		21
Financial Liabilities
Deposits		16,125,808		—		—		16,125,808
Advances from Federal Home Loan Bank		155,133		—		155,133		—
Other borrowings		19,632		—		—		19,632
Long-term debt		65,487		—		65,487		—