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

6 Months Ended

Jun. 30, 2023

Notes Tables

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

	June 30, 2023
	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	$	272,038	$	—	$	—	$	272,038
U.S. government agency entities		—		55,543		—		55,543
U.S. government sponsored entities		—		33,614		—		33,614
Mortgage-backed securities		—		822,244		—		822,244
Collateralized mortgage obligations		—		29,503		—		29,503
Corporate debt securities		—		251,928		—		251,928
Foreign debt securities		—		22,451		—		22,451
Total securities available-for-sale		272,038		1,215,283		—		1,487,321
Equity securities
Mutual funds		5,509		—		—		5,509
Preferred stock of government sponsored entities		1,391		—		—		1,391
Other equity securities		30,774		—		—		30,774
Total equity securities		37,674		—		—		37,674
Interest rate swaps		—		81,759		—		81,759
Foreign exchange contracts		—		648		—		648
Total assets	$	309,712	$	1,297,690	$	—	$	1,607,402
Liabilities
Interest rate swaps	$	—	$	50,017	$	—	$	50,017
Foreign exchange contracts		—		632		—		632
Total liabilities	$	—	$	50,649	$	—	$	50,649

	December 31, 2022
	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	$	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 June 30, 2023								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, 2023		June 30, 2022		June 30, 2023		June 30, 2022
	(In thousands)
Assets
Non accrual loans by type:
Commercial loans	$	—	$	—	$	7,921	$	7,921	$	34	$	—	$	2,037	$	—
Commercial mortgage loans		—		—		7,762		7,762		1,202		—		5,192		—
Total non accrual loans		—		—		15,683		15,683		1,236		—		7,229		—
Other real estate owned (1)		—		—		4,328		4,328		—		—		—		—
Investments in venture capital		—		—		480		480		—		—		—		—
Total assets	$	—	$	—	$	20,491	$	20,491	$	1,236	$	—	$	7,229	$	—

	As of December 31, 2022								Total Losses
	Fair Value Measurements Using						Total Fair Value		For the Twelve Months Ended
	Level 1		Level 2		Level 3		Measurements		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]

	June 30, 2023				December 31, 2022
	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
	(In thousands)
Financial Assets
Cash and due from banks	$	187,886	$	187,886	$	195,440	$	195,440
Short-term investments		1,294,379		1,294,379		966,962		966,962
Securities available-for-sale		1,487,321		1,487,321		1,473,348		1,473,348
Loans, net		18,788,188		18,647,234		18,100,898		17,944,588
Equity securities		37,674		37,674		22,158		22,158
Investment in Federal Home Loan Bank stock		25,242		25,242		17,250		17,250
Warrants		—		—		50		50

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Foreign exchange contracts	$	249,696	$	648	$	72,996	$	448
Interest rate swaps		1,402,060		81,759		817,615		44,443

	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
Financial Liabilities
Deposits	$	19,097,003	$	19,216,932	$	18,505,279	$	18,572,387
Advances from Federal Home Loan Bank		815,000		811,425		485,000		482,737
Other borrowings		22,428		18,177		22,600		18,385
Long-term debt		119,136		66,685		119,136		68,231

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Foreign exchange contracts	$	49,196	$	632	$	170,213	$	942
Interest rate swaps		640,397		50,017		595,426		51,864

	Notional					Notional
	Amount		Fair Value			Amount		Fair Value
Off-Balance Sheet Financial Instruments
Commitments to extend credit	$	3,896,018	$	(15,490	)	$	3,630,304	$	(14,797	)
Standby letters of credit		333,550		(2,727	)		315,821		(2,738	)
Other letters of credit		10,515		(9	)		29,416		(33	)

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

	As of June 30, 2023
	Estimated
	Fair Value
	Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	187,886	$	187,886	$	—	$	—
Short-term investments		1,294,379		1,294,379		—		—
Securities available-for-sale		1,487,321		272,038		1,215,283		—
Loans, net		18,647,234		—		—		18,647,234
Equity securities		37,674		37,674		—		—
Investment in Federal Home Loan Bank stock		25,242		—		25,242		—
Financial Liabilities
Deposits		19,216,932		—		—		19,216,932
Advances from Federal Home Loan Bank		811,425		—		811,425		—
Other borrowings		18,177		—		—		18,177
Long-term debt		66,685		—		66,685		—

	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		—