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

3 Months Ended

Mar. 31, 2021

Notes Tables

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

	March 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. Treasury securities	$	40,720	$	—	$	—	$	40,720
U.S. government agency entities		—		96,051		—		96,051
Mortgage-backed securities		—		668,424		—		668,424
Collateralized mortgage obligations		—		10,127		—		10,127
Corporate debt securities		—		93,522		—		93,522
Total securities available-for-sale	$	40,720	$	868,124	$	—	$	908,844
Equity securities
Mutual funds	$	6,301	$	—	$	—	$	6,301
Preferred stock of government sponsored entities		3,328		—		—		3,328
Other equity securities		11,364		—		—		11,364
Total equity securities	$	20,993	$	—	$	—	$	20,993
Warrants	$	—	$	—	$	16	$	16
Interest rate swaps		—		3,615		—		3,615
Foreign exchange contracts		—		2,891		—		2,891
Total assets	$	61,713	$	874,630	$	16	$	936,359
Liabilities
Interest rate swaps	$	—	$	12,116	$	—	$	12,116
Foreign exchange contracts		—		2,550		—		2,550
Total liabilities	$	—	$	14,666	$	—	$	14,666

	December 31, 2020
	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	$	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 March 31, 2021								Total Losses
	Fair Value Measurements Using						Total Fair Value		For the Three Months Ended
	Level 1		Level 2		Level 3		Measurements		March 31, 2021		March 31, 2020
	(In thousands)
Assets
Loans held-for-investment:
Commercial loans	$	—	$	—	$	14,258	$	14,258	$	—	$	—
Commercial mortgage loans		—		—		11,029		11,029		—		—
Total loans held-for-investment		—		—		25,287		25,287		—		—
Other real estate owned (1)		—		905		4,236		5,141		—		336
Investments in venture capital and private company stock		—		—		1,094		1,094		71		33
Total assets	$	—	$	905	$	30,617	$	31,522	$	71	$	369

	As of December 31, 2020								Total Losses
	Fair Value Measurements Using						Total Fair Value		For the Twelve Months Ended
	Level 1		Level 2		Level 3		Measurements		December 31, 2020		December 31, 2019
	(In thousands)
Assets
Impaired loans by type:
Commercial loans	$	—	$	—	$	5,342	$	5,342	$	7,012	$	—
Commercial mortgage loans		—		—		25,749		25,749		—		—
Residential mortgage loans 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 and private company stock		—		—		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]

	March 31, 2021				December 31, 2020
	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
	(In thousands)
Financial Assets
Cash and due from banks	$	141,885	$	141,885	$	138,616	$	138,616
Short-term investments		1,612,411		1,612,411		1,282,462		1,282,462
Securities available-for-sale		908,844		908,844		1,036,550		1,036,550
Loans, net		15,497,712		16,094,374		15,475,364		16,103,471
Equity securities		20,993		20,993		23,744		23,744
Investment in Federal Home Loan Bank stock		17,250		17,250		17,250		17,250
Warrants		16		16		21		21

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Foreign exchange contracts	$	154,340	$	2,891	$	151,244	$	4,658
Interest rate swaps		496,140		3,615		96,889		3,409

	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
Financial Liabilities
Deposits	$	16,353,633	$	16,364,101	$	16,109,401	$	16,125,808
Advances from Federal Home Loan Bank		75,000		77,691		150,000		155,133
Other borrowings		23,333		19,861		23,714		19,632
Long-term debt		119,136		64,892		119,136		65,487

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Foreign exchange contracts	$	96,119	$	2,550	$	132,813	$	2,200
Interest rate swaps		662,228		12,116		679,648		10,286

	Notional					Notional
	Amount		Fair Value			Amount		Fair Value
Off-Balance Sheet Financial Instruments
Commitments to extend credit	$	3,095,013	$	(9,614	)	$	2,977,528	$	(8,432	)
Standby letters of credit		237,488		(1,720	)		234,200		(1,630	)
Other letters of credit		21,975		(19	)		16,821		(16	)
Bill of lading guarantees		—		—			238		—

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

	As of March 31, 2021
	Estimated
	Fair Value
	Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	141,885	$	141,885	$	—	$	—
Short-term investments		1,612,411		1,612,411		—		—
Securities available-for-sale		908,844		40,720		868,124		—
Loans, net		16,094,374		—		—		16,094,374
Equity securities		20,993		20,993		—		—
Investment in Federal Home Loan Bank stock		17,250		—		17,250		—
Warrants		16		—		—		16
Financial Liabilities
Deposits		16,364,101		—		—		16,364,101
Advances from Federal Home Loan Bank		77,691		—		77,691		—
Other borrowings		19,861		—		—		19,861
Long-term debt		64,892		—		64,892		—

	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		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		—