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

6 Months Ended

Jun. 30, 2021

Notes Tables

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

	June 30, 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	$	40,467	$	—	$	—	$	40,467
U.S. government agency entities		—		93,312		—		93,312
Mortgage-backed securities		—		749,476		—		749,476
Collateralized mortgage obligations		—		9,736		—		9,736
Corporate debt securities		—		109,524		—		109,524
Total securities available-for-sale		40,467		962,048		—		1,002,515
Equity securities
Mutual funds		6,318		—		—		6,318
Preferred stock of government sponsored entities		1,313		—		—		1,313
Other equity securities		12,482		—		—		12,482
Total equity securities		20,113		—		—		20,113
Warrants		—		—		22		22
Interest rate swaps		—		4,904		—		4,904
Foreign exchange contracts		—		3,667		—		3,667
Total assets	$	60,580	$	970,619	$	22	$	1,031,221
Liabilities
Interest rate swaps	$	—	$	9,593	$	—	$	9,593
Foreign exchange contracts		—		3,831		—		3,831
Total liabilities	$	—	$	13,424	$	—	$	13,424

	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		—		99,839		—		99,839
Mortgage-backed securities		—		727,068		—		727,068
Collateralized mortgage obligations		—		10,324		—		10,324
Corporate debt securities		—		118,371		—		118,371
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 June 30, 2021								Total Losses
	Fair Value Measurements Using						Total Fair Value		For the Three Months Ended				For the Six Months Ended
	Level 1		Level 2		Level 3		Measurements		June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
	(In thousands)
Assets
Loans held-for-investment:
Commercial loans	$	—	$	—	$	2,059	$	2,059	$	—	$	—	$	—	$	—
Commercial mortgage loans		—		—		11,742		11,742		—		—		—		—
Residential mortgage loans and equity lines		—		—		3,511		3,511		—		—		—		—
Total loans held-for-investment		—		—		17,312		17,312		—		—		—		—
Other real estate owned (1)		—		—		5,091		5,091		47		381		47		717
Investments in venture capital and private company stock		—		—		1,015		1,015		64		71		135		104
Total assets	$	—	$	—	$	23,418	$	23,418	$	111	$	452	$	182	$	821

	As of December 31, 2020
	Fair Value Measurements Using						Total Fair Value
	Level 1		Level 2		Level 3		Measurements
	(In thousands)
Assets
Impaired loans by type:
Commercial loans	$	—	$	—	$	5,342	$	5,342
Commercial mortgage loans		—		—		25,749		25,749
Residential mortgage loans and equity lines		—		—		4,307		4,307
Total impaired loans		—		—		35,398		35,398
Other real estate owned (1)		—		—		5,141		5,141
Investments in venture capital and private company stock		—		—		1,381		1,381
Total assets	$	—	$	—	$	41,920	$	41,920

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

	June 30, 2021				December 31, 2020
	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
	(In thousands)
Financial Assets
Cash and due from banks	$	133,507	$	133,507	$	138,616	$	138,616
Short-term investments		1,589,086		1,589,086		1,282,462		1,282,462
Securities available-for-sale		1,002,515		1,002,515		1,036,550		1,036,550
Loans, net		15,690,689		16,095,071		15,475,364		16,103,471
Equity securities		20,113		20,113		23,744		23,744
Investment in Federal Home Loan Bank stock		17,250		17,250		17,250		17,250
Warrants		22		22		21		21

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Foreign exchange contracts	$	200,863	$	3,667	$	151,244	$	4,658
Interest rate swaps		563,399		4,904		96,889		3,409

	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
Financial Liabilities
Deposits	$	16,537,513	$	16,545,365	$	16,109,401	$	16,125,808
Advances from Federal Home Loan Bank		20,000		20,986		150,000		155,133
Other borrowings		23,249		19,074		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	$	155,052	$	3,831	$	132,813	$	2,200
Interest rate swaps		703,984		9,593		679,648		10,286

	Notional					Notional
	Amount		Fair Value			Amount		Fair Value
Off-Balance Sheet Financial Instruments
Commitments to extend credit	$	3,048,412	$	(10,632	)	$	2,977,528	$	(8,432	)
Standby letters of credit		222,196		(2,106	)		234,200		(1,630	)
Other letters of credit		27,361		(52	)		16,821		(16	)
Bill of lading guarantees		—		—			238		—

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

	As of June 30, 2021
	Estimated
	Fair Value
	Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	133,507	$	133,507	$	—	$	—
Short-term investments		1,589,086		1,589,086		—		—
Securities available-for-sale		1,002,515		40,467		962,048		—
Loans, net		16,095,071		—		—		16,095,071
Equity securities		20,113		20,113		—		—
Investment in Federal Home Loan Bank stock		17,250		—		17,250		—
Warrants		22		—		—		22
Financial Liabilities
Deposits		16,545,365		—		—		16,545,365
Advances from Federal Home Loan Bank		20,986		—		20,986		—
Other borrowings		19,074		—		—		19,074
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		—