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

3 Months Ended

Mar. 31, 2023

Notes Tables

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

	March 31, 2023
	Fair Value Measurements Using						Total at
	Level 1		Level 2		Level 3		Fair Value
	(In thousands)
Assets
Securities available-for-sale
U.S. Treasury securities	$	269,698	$	—	$	—	$	269,698
U.S. government agency entities		—		59,931		—		59,931
U.S. government sponsored entities		—		40,014		—		40,014
Mortgage-backed securities.		—		857,302		—		857,302
Collateralized mortgage obligations.		—		30,967		—		30,967
Corporate debt securities		—		283,338		—		283,338
Total securities available-for-sale		269,698		1,271,552		—		1,541,250
Equity securities
Mutual funds		1,047		—		—		1,047
Preferred stock of government sponsored entities.		5,597		—		—		5,597
Other equity securities		20,367		—		—		20,367
Total equity securities		27,011		—		—		27,011
Interest rate swaps		—		49,620		—		49,620
Foreign exchange contracts		—		975		—		975
Total assets	$	296,709	$	1,322,147	$	—	$	1,618,856
Liabilities
Interest rate swaps	$	—	$	42,027	$	—	$	42,027
Foreign exchange contracts		—		429		—		429
Total liabilities	$	—	$	42,456	$	—	$	42,456

	December 31, 2022
	Fair Value Measurements Using						Total at
	Level 1		Level 2		Level 3		Fair Value
	(In thousands)
Assets
Securities available-for-sale
U.S. Treasury securities	$	240,500	$	—	$	—	$	240,500
U.S. government agency entities		—		63,610		—		63,610
U.S. government sponsored entities		—		30,000		—		30,000
Mortgage-backed securities.		—		867,094		—		867,094
Collateralized mortgage obligations.		—		31,061		—		31,061
Corporate debt securities		—		241,083		—		241,083
Total securities available-for-sale		240,500		1,232,848		—		1,473,348
Equity securities
Mutual funds		5,509		—		—		5,509
Preferred stock of government sponsored entities.		1,289		—		—		1,289
Other equity securities		15,360		—		—		15,360
Total equity securities		22,158		—		—		22,158
Warrants		—		—		50		50
Interest rate swaps		—		44,443		—		44,443
Foreign exchange contracts		—		448		—		448
Total assets	$	262,658	$	1,277,739	$	50	$	1,540,447
Liabilities
Interest rate swaps	$	—	$	51,864	$	—	$	51,864
Foreign exchange contracts		—		942		—		942
Total liabilities	$	—	$	52,806	$	—	$	52,806

Fair Value Measurements, Nonrecurring [Table Text Block]

	As of March 31, 2023								Total Losses
	Fair Value Measurements Using						Total at		For the Three Months Ended
	Level 1		Level 2		Level 3		Fair Value		March 31, 2023		March 31, 2022
	(In thousands)
Assets
Non accrual loans by type:
Commercial loans	$	—	$	—	$	11,032	$	11,032	$	2,793	$	—
Commercial mortgage loans		—		—		7,907		7,907		3,990		—
Residential mortgage loans and equity lines		—		—		—		—		—		—
Total non accrual loans		—		—		18,939		18,939		6,783		—
Other real estate owned (1)		—		—		4,328		4,328		—		—
Investments in venture capital		—		—		561		561		—		—
Total assets	$	—	$	—	$	23,828	$	23,828	$	6,783	$	—

	As of December 31, 2022								Total Losses
	Fair Value Measurements Using						Total at		For the Twelve Months Ended
	Level 1		Level 2		Level 3		Fair Value		December 31, 2022		December 31, 2021
	(In thousands)
Assets
Non accrual loans by type:
Commercial loans	$	—	$	—	$	12,950	$	12,950	$	1,786	$	1,012
Commercial mortgage loans		—		—		32,205		32,205		2,091		—
Residential mortgage loans and equity lines		—		—		8,978		8,978		—		—
Installment and other loans		—		—		8		8		—		—
Total non accrual loans		—		—		54,141		54,141		3,877		1,012
Other real estate owned (1)		—		—		4,328		4,328		—		17
Investments in venture capital .		—		—		689		689		268		143
Total assets	$	—	$	—	$	59,158	$	59,158	$	4,145	$	1,172

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

	March 31, 2023				December 31, 2022
	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
	(In thousands)
Financial Assets
Cash and due from banks	$	252,048	$	252,048	$	195,440	$	195,440
Short-term investments		881,282		881,282		966,962		966,962
Securities available-for-sale		1,541,250		1,541,250		1,473,348		1,473,348
Loans, net		18,166,583		18,195,465		18,100,898		17,944,588
Equity securities		27,011		27,011		22,158		22,158
Investment in Federal Home Loan Bank stock		17,250		17,250		17,250		17,250
Warrants		—		—		50		50

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Foreign exchange contracts	$	234,733	$	975	$	72,996	$	448
Interest rate swaps		933,688		49,620		817,615		44,443

	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
Financial Liabilities
Deposits	$	18,648,872	$	18,798,687	$	18,505,279	$	18,572,387
Advances from Federal Home Loan Bank		360,000		358,334		485,000		482,737
Other borrowings		22,481		18,461		22,600		18,385
Long-term debt		119,136		61,939		119,136		68,231

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Foreign exchange contracts.	$	42,753	$	429	$	170,213	$	942
Interest rate swaps		592,514		42,027		595,426		51,864

	Notional					Notional
	Amount		Fair Value			Amount		Fair Value
Off-Balance Sheet Financial Instruments
Commitments to extend credit	$	3,806,329	$	(13,896	)	$	3,630,304	$	(14,797	)
Standby letters of credit		332,575		(2,825	)		315,821		(2,738	)
Other letters of credit		9,073		(8	)		29,416		(33	)

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

	As of March 31, 2023
	Estimated
	Fair Value
	Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	252,048	$	252,048	$	—	$	—
Short-term investments.		881,282		881,282		—		—
Securities available-for-sale		1,541,250		269,698		1,271,552		—
Loans, net		18,195,465		—		—		18,195,465
Equity securities		27,011		27,011		—		—
Investment in Federal Home Loan Bank stock		17,250		—		17,250		—
Financial Liabilities
Deposits		18,798,687		—		—		18,798,687
Advances from Federal Home Loan Bank		358,334		—		358,334		—
Other borrowings		18,461		—		—		18,461
Long-term debt		61,939		—		61,939		—

	As of December 31, 2022
	Estimated
	Fair Value
	Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	195,440	$	195,440	$	—	$	—
Short-term investments.		966,962		966,962		—		—
Securities available-for-sale		1,473,348		240,500		1,232,848		—
Loans, net		17,944,588		—		—		17,944,588
Equity securities		22,158		22,158		—		—
Investment in Federal Home Loan Bank stock		17,250		—		17,250		—
Warrants		50		—		—		50
Financial Liabilities
Deposits		18,572,387		—		—		18,572,387
Advances from Federal Home Loan Bank		482,737		—		482,737		—
Other borrowings		18,385		—		—		18,385
Long-term debt		68,231		—		68,231		—