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

9 Months Ended

Sep. 30, 2021

Notes Tables

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

	September 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	$	40,211	$	—	$	—	$	40,211
U.S. government agency entities		—		90,943		—		90,943
Mortgage-backed securities		—		805,067		—		805,067
Collateralized mortgage obligations		—		9,561		—		9,561
Corporate debt securities		—		133,434		—		133,434
Total securities available-for-sale		40,211		1,039,005		—		1,079,216
Equity securities
Mutual funds		6,289		—		—		6,289
Preferred stock of government sponsored entities		1,493		—		—		1,493
Other equity securities		12,335		—		—		12,335
Total equity securities		20,117		—		—		20,117
Warrants		—		—		22		22
Interest rate swaps		—		5,187		—		5,187
Foreign exchange contracts		—		1,319		—		1,319
Total assets	$	60,328	$	1,045,511	$	22	$	1,105,861
Liabilities
Interest rate swaps	$	—	$	9,037	$	—	$	9,037
Foreign exchange contracts		—		1,723		—		1,723
Total liabilities	$	—	$	10,760	$	—	$	10,760

	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 September 30, 2021								Total Losses
	Fair Value Measurements Using						Total Fair		For the Three Months Ended					For the Nine Months Ended
	Level 1		Level 2		Level 3		Value Measurements		September 30, 2021			September 30, 2020		September 30, 2021			September 30, 2020
	(In thousands)
Assets
Loans held-for-investment:
Commercial loans	$	—	$	—	$	5,355	$	5,355	$	—		$	6,950	$	2,037		$	6,950
Commercial mortgage loans		—		—		13,332		13,332		—			—		—			—
Residential mortgage loans and equity lines		—		—		2,277		2,227		—			—		—			—
Total loans held-for-investment		—		—		20,964		20,914		—			6,950		2,037			6,950
Other real estate owned (1)		—		—		5,497		5,497		(55	)		—		(8	)		717
Investments in venture capital and private company stock		—		—		1,007		1,007		8			3		143			107
Total assets	$	—	$	—	$	27,468	$	27,418	$	(47	)	$	6,953	$	2,172		$	7,774

	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]

	September 30, 2021				December 31, 2020
	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
	(In thousands)
Financial Assets
Cash and due from banks	$	156,287	$	156,287	$	138,616	$	138,616
Short-term investments		1,667,875		1,667,875		1,282,462		1,282,462
Securities available-for-sale		1,079,216		1,079,216		1,036,550		1,036,550
Loans, net		15,976,781		16,301,993		15,475,364		16,103,471
Equity securities		20,117		20,117		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	$	161,535	$	1,319	$	151,244	$	4,658
Interest rate swaps		664,288		5,187		96,889		3,409

	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
Financial Liabilities
Deposits	$	17,006,870	$	17,007,694	$	16,109,401	$	16,125,808
Advances from Federal Home Loan Bank		20,000		20,856		150,000		155,133
Other borrowings		23,197		19,164		23,714		19,632
Long-term debt		119,136		62,274		119,136		65,487

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Foreign exchange contracts	$	70,184	$	1,723	$	132,813	$	2,200
Interest rate swaps		788,802		9,037		679,648		10,286

	Notional					Notional
	Amount		Fair Value			Amount		Fair Value
Off-Balance Sheet Financial Instruments
Commitments to extend credit	$	3,255,421	$	(11,020	)	$	2,977,528	$	(8,432	)
Standby letters of credit		248,958		(2,172	)		234,200		(1,630	)
Other letters of credit		25,205		(15	)		16,821		(16	)
Bill of lading guarantees		—		—			238		—

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

	As of September 30, 2021
	Estimated
	Fair Value
	Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	156,287	$	156,287	$	—	$	—
Short-term investments		1,667,875		1,667,875		—		—
Securities available-for-sale		1,079,216		40,211		1,039,005		—
Loans, net		16,301,993		—		—		16,301,993
Equity securities		20,117		20,117		—		—
Investment in Federal Home Loan Bank stock		17,250		—		17,250		—
Warrants		22		—		—		22
Financial Liabilities
Deposits		17,007,694		—		—		17,007,694
Advances from Federal Home Loan Bank		20,856		—		20,856		—
Other borrowings		19,164		—		—		19,164
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		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		—